io.reactivex.rxjava3.core

Class Single<T>

java.lang.Object

io.reactivex.rxjava3.core.Single<T>

Type Parameters:

T - the type of the item emitted by the Single

All Implemented Interfaces:

SingleSource<T>

Direct Known Subclasses:

SingleSubject

public abstract class Single<T>
extends Object
implements SingleSource<T>

The Single class implements the Reactive Pattern for a single value response.

Single behaves similarly to Observable except that it can only emit either a single successful value or an error (there is no "onComplete" notification as there is for an Observable).

The Single class implements the SingleSource base interface and the default consumer type it interacts with is the SingleObserver via the subscribe(SingleObserver) method.

The Single operates with the following sequential protocol:

     onSubscribe (onSuccess | onError)?
 

Note that onSuccess and onError are mutually exclusive events; unlike Observable, onSuccess is never followed by onError.

Like Observable, a running Single can be stopped through the Disposable instance provided to consumers through SingleObserver.onSubscribe(io.reactivex.rxjava3.disposables.Disposable).

Like an Observable, a Single is lazy, can be either "hot" or "cold", synchronous or asynchronous. Single instances returned by the methods of this class are cold and there is a standard hot implementation in the form of a subject: SingleSubject.

The documentation for this class makes use of marble diagrams. The following legend explains these diagrams:

See Flowable or Observable for the implementation of the Reactive Pattern for a stream or vector of values.

For more information see the ReactiveX documentation.

Example:

 Disposable d = Single.just("Hello World")
    .delay(10, TimeUnit.SECONDS, Schedulers.io())
    .subscribeWith(new DisposableSingleObserver<String>() {
        @Override
        public void onStart() {
            System.out.println("Started");
        }

        @Override
        public void onSuccess(String value) {
            System.out.println("Success: " + value);
        }

        @Override
        public void onError(Throwable error) {
            error.printStackTrace();
        }
    });
 
 Thread.sleep(5000);
 
 d.dispose();
 

Note that by design, subscriptions via subscribe(SingleObserver) can't be disposed from the outside (hence the void return of the subscribe(SingleObserver) method) and it is the responsibility of the implementor of the SingleObserver to allow this to happen. RxJava supports such usage with the standard DisposableSingleObserver instance. For convenience, the subscribeWith(SingleObserver) method is provided as well to allow working with a SingleObserver (or subclass) instance to be applied with in a fluent manner (such as in the example above).

Since:

2.0

See Also:

DisposableSingleObserver

Constructor Summary

Constructors

Constructor and Description
Single()

Method Summary

Modifier and Type	Method and Description
static <T> Single<T>	amb(Iterable<? extends SingleSource<? extends T>> sources) Runs multiple SingleSources and signals the events of the first one that signals (disposing the rest).
static <T> Single<T>	ambArray(SingleSource<? extends T>... sources) Runs multiple SingleSources and signals the events of the first one that signals (disposing the rest).
Single<T>	ambWith(SingleSource<? extends T> other) Signals the event of this or the other SingleSource whichever signals first.
T	blockingGet() Waits in a blocking fashion until the current Single signals a success value (which is returned) or an exception (which is propagated).
Single<T>	cache() Stores the success value or exception from the current Single and replays it to late SingleObservers.
<U> Single<U>	cast(Class<? extends U> clazz) Casts the success value of the current Single into the target type or signals a ClassCastException if not compatible.
<R> Single<R>	compose(SingleTransformer<? super T,? extends R> transformer) Transform a Single by applying a particular Transformer function to it.
static <T> Flowable<T>	concat(Iterable<? extends SingleSource<? extends T>> sources) Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by an Iterable sequence.
static <T> Observable<T>	concat(ObservableSource<? extends SingleSource<? extends T>> sources) Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by an Observable sequence.
static <T> Flowable<T>	concat(Publisher<? extends SingleSource<? extends T>> sources) Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by a Publisher sequence.
static <T> Flowable<T>	concat(Publisher<? extends SingleSource<? extends T>> sources, int prefetch) Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by a Publisher sequence and prefetched by the specified amount.
static <T> Flowable<T>	concat(SingleSource<? extends T> source1, SingleSource<? extends T> source2) Returns a Flowable that emits the items emitted by two Singles, one after the other.
static <T> Flowable<T>	concat(SingleSource<? extends T> source1, SingleSource<? extends T> source2, SingleSource<? extends T> source3) Returns a Flowable that emits the items emitted by three Singles, one after the other.
static <T> Flowable<T>	concat(SingleSource<? extends T> source1, SingleSource<? extends T> source2, SingleSource<? extends T> source3, SingleSource<? extends T> source4) Returns a Flowable that emits the items emitted by four Singles, one after the other.
static <T> Flowable<T>	concatArray(SingleSource<? extends T>... sources) Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided in an array.
static <T> Flowable<T>	concatArrayEager(SingleSource<? extends T>... sources) Concatenates a sequence of SingleSource eagerly into a single stream of values.
static <T> Flowable<T>	concatEager(Iterable<? extends SingleSource<? extends T>> sources) Concatenates a sequence of SingleSources eagerly into a single stream of values.
static <T> Flowable<T>	concatEager(Publisher<? extends SingleSource<? extends T>> sources) Concatenates a Publisher sequence of SingleSources eagerly into a single stream of values.
Flowable<T>	concatWith(SingleSource<? extends T> other) Returns a Flowable that emits the item emitted by the source Single, then the item emitted by the specified Single.
Single<Boolean>	contains(Object value) Signals true if the current Single signals a success value that is Object-equals with the value provided.
Single<Boolean>	contains(Object value, BiPredicate<Object,Object> comparer) Signals true if the current Single signals a success value that is equal with the value provided by calling a bi-predicate.
static <T> Single<T>	create(SingleOnSubscribe<T> source) Provides an API (via a cold Single) that bridges the reactive world with the callback-style world.
static <T> Single<T>	defer(Supplier<? extends SingleSource<? extends T>> singleSupplier) Calls a Supplier for each individual SingleObserver to return the actual SingleSource to be subscribed to.
Single<T>	delay(long time, TimeUnit unit) Delays the emission of the success signal from the current Single by the specified amount.
Single<T>	delay(long time, TimeUnit unit, boolean delayError) Delays the emission of the success or error signal from the current Single by the specified amount.
Single<T>	delay(long time, TimeUnit unit, Scheduler scheduler) Delays the emission of the success signal from the current Single by the specified amount.
Single<T>	delay(long time, TimeUnit unit, Scheduler scheduler, boolean delayError) Delays the emission of the success or error signal from the current Single by the specified amount.
Single<T>	delaySubscription(CompletableSource other) Delays the actual subscription to the current Single until the given other CompletableSource completes.
Single<T>	delaySubscription(long time, TimeUnit unit) Delays the actual subscription to the current Single until the given time delay elapsed.
Single<T>	delaySubscription(long time, TimeUnit unit, Scheduler scheduler) Delays the actual subscription to the current Single until the given time delay elapsed.
<U> Single<T>	delaySubscription(ObservableSource<U> other) Delays the actual subscription to the current Single until the given other ObservableSource signals its first value or completes.
<U> Single<T>	delaySubscription(Publisher<U> other) Delays the actual subscription to the current Single until the given other Publisher signals its first value or completes.
<U> Single<T>	delaySubscription(SingleSource<U> other) Delays the actual subscription to the current Single until the given other SingleSource signals success.
<R> Maybe<R>	dematerialize(Function<? super T,Notification<R>> selector) Maps the Notification success value of this Single back into normal onSuccess, onError or onComplete signals as a Maybe source.
Single<T>	doAfterSuccess(Consumer<? super T> onAfterSuccess) Calls the specified consumer with the success item after this item has been emitted to the downstream.
Single<T>	doAfterTerminate(Action onAfterTerminate) Registers an Action to be called after this Single invokes either onSuccess or onError.
Single<T>	doFinally(Action onFinally) Calls the specified action after this Single signals onSuccess or onError or gets disposed by the downstream.
Single<T>	doOnDispose(Action onDispose) Calls the shared Action if a SingleObserver subscribed to the current Single disposes the common Disposable it received via onSubscribe.
Single<T>	doOnError(Consumer<? super Throwable> onError) Calls the shared consumer with the error sent via onError for each SingleObserver that subscribes to the current Single.
Single<T>	doOnEvent(BiConsumer<? super T,? super Throwable> onEvent) Calls the shared consumer with the error sent via onError or the value via onSuccess for each SingleObserver that subscribes to the current Single.
Single<T>	doOnSubscribe(Consumer<? super Disposable> onSubscribe) Calls the shared consumer with the Disposable sent through the onSubscribe for each SingleObserver that subscribes to the current Single.
Single<T>	doOnSuccess(Consumer<? super T> onSuccess) Calls the shared consumer with the success value sent via onSuccess for each SingleObserver that subscribes to the current Single.
Single<T>	doOnTerminate(Action onTerminate) Returns a Single instance that calls the given onTerminate callback just before this Single completes normally or with an exception.
static <T> Single<Boolean>	equals(SingleSource<? extends T> first, SingleSource<? extends T> second) Compares two SingleSources and emits true if they emit the same value (compared via Object.equals).
static <T> Single<T>	error(Supplier<? extends Throwable> errorSupplier) Signals a Throwable returned by the callback function for each individual SingleObserver.
static <T> Single<T>	error(Throwable exception) Returns a Single that invokes a subscriber's onError method when the subscriber subscribes to it.
Maybe<T>	filter(Predicate<? super T> predicate) Filters the success item of the Single via a predicate function and emitting it if the predicate returns true, completing otherwise.
<R> Single<R>	flatMap(Function<? super T,? extends SingleSource<? extends R>> mapper) Returns a Single that is based on applying a specified function to the item emitted by the source Single, where that function returns a SingleSource.
Completable	flatMapCompletable(Function<? super T,? extends CompletableSource> mapper) Returns a Completable that completes based on applying a specified function to the item emitted by the source Single, where that function returns a Completable.
<R> Maybe<R>	flatMapMaybe(Function<? super T,? extends MaybeSource<? extends R>> mapper) Returns a Maybe that is based on applying a specified function to the item emitted by the source Single, where that function returns a MaybeSource.
<R> Observable<R>	flatMapObservable(Function<? super T,? extends ObservableSource<? extends R>> mapper) Returns an Observable that is based on applying a specified function to the item emitted by the source Single, where that function returns an ObservableSource.
<R> Flowable<R>	flatMapPublisher(Function<? super T,? extends Publisher<? extends R>> mapper) Returns a Flowable that emits items based on applying a specified function to the item emitted by the source Single, where that function returns a Publisher.
<U> Flowable<U>	flattenAsFlowable(Function<? super T,? extends Iterable<? extends U>> mapper) Maps the success value of the upstream Single into an Iterable and emits its items as a Flowable sequence.
<U> Observable<U>	flattenAsObservable(Function<? super T,? extends Iterable<? extends U>> mapper) Maps the success value of the upstream Single into an Iterable and emits its items as an Observable sequence.
static <T> Single<T>	fromCallable(Callable<? extends T> callable) Returns a Single that invokes passed function and emits its result for each new SingleObserver that subscribes.
static <T> Single<T>	fromFuture(Future<? extends T> future) Converts a Future into a Single.
static <T> Single<T>	fromFuture(Future<? extends T> future, long timeout, TimeUnit unit) Converts a Future into a Single, with a timeout on the Future.
static <T> Single<T>	fromFuture(Future<? extends T> future, long timeout, TimeUnit unit, Scheduler scheduler) Converts a Future into a Single, with a timeout on the Future.
static <T> Single<T>	fromFuture(Future<? extends T> future, Scheduler scheduler) Converts a Future, operating on a specified Scheduler, into a Single.
static <T> Single<T>	fromObservable(ObservableSource<? extends T> observableSource) Wraps a specific ObservableSource into a Single and signals its single element or error.
static <T> Single<T>	fromPublisher(Publisher<? extends T> publisher) Wraps a specific Publisher into a Single and signals its single element or error.
static <T> Single<T>	fromSupplier(Supplier<? extends T> supplier) Returns a Single that invokes passed supplierfunction and emits its result for each new SingleObserver that subscribes.
Single<T>	hide() Hides the identity of the current Single, including the Disposable that is sent to the downstream via onSubscribe().
Completable	ignoreElement() Returns a Completable that ignores the success value of this Single and signals onComplete instead.
static <T> Single<T>	just(T item) Returns a Single that emits a specified item.
<R> Single<R>	lift(SingleOperator<? extends R,? super T> lift) This method requires advanced knowledge about building operators, please consider other standard composition methods first; Returns a Single which, when subscribed to, invokes the apply(SingleObserver) method of the provided SingleOperator for each individual downstream Single and allows the insertion of a custom operator by accessing the downstream's SingleObserver during this subscription phase and providing a new SingleObserver, containing the custom operator's intended business logic, that will be used in the subscription process going further upstream.
<R> Single<R>	map(Function<? super T,? extends R> mapper) Returns a Single that applies a specified function to the item emitted by the source Single and emits the result of this function application.
Single<Notification<T>>	materialize() Maps the signal types of this Single into a Notification of the same kind and emits it as a single success value to downstream.
static <T> Flowable<T>	merge(Iterable<? extends SingleSource<? extends T>> sources) Merges an Iterable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once.
static <T> Flowable<T>	merge(Publisher<? extends SingleSource<? extends T>> sources) Merges a Flowable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once.
static <T> Single<T>	merge(SingleSource<? extends SingleSource<? extends T>> source) Flattens a Single that emits a Single into a single Single that emits the item emitted by the nested Single, without any transformation.
static <T> Flowable<T>	merge(SingleSource<? extends T> source1, SingleSource<? extends T> source2) Flattens two Singles into a single Flowable, without any transformation.
static <T> Flowable<T>	merge(SingleSource<? extends T> source1, SingleSource<? extends T> source2, SingleSource<? extends T> source3) Flattens three Singles into a single Flowable, without any transformation.
static <T> Flowable<T>	merge(SingleSource<? extends T> source1, SingleSource<? extends T> source2, SingleSource<? extends T> source3, SingleSource<? extends T> source4) Flattens four Singles into a single Flowable, without any transformation.
static <T> Flowable<T>	mergeDelayError(Iterable<? extends SingleSource<? extends T>> sources) Merges an Iterable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once and delaying any error(s) until all sources succeed or fail.
static <T> Flowable<T>	mergeDelayError(Publisher<? extends SingleSource<? extends T>> sources) Merges a Flowable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once and delaying any error(s) until all sources succeed or fail.
static <T> Flowable<T>	mergeDelayError(SingleSource<? extends T> source1, SingleSource<? extends T> source2) Flattens two Singles into a single Flowable, without any transformation, delaying any error(s) until all sources succeed or fail.
static <T> Flowable<T>	mergeDelayError(SingleSource<? extends T> source1, SingleSource<? extends T> source2, SingleSource<? extends T> source3) Flattens three Singles into a single Flowable, without any transformation, delaying any error(s) until all sources succeed or fail.
static <T> Flowable<T>	mergeDelayError(SingleSource<? extends T> source1, SingleSource<? extends T> source2, SingleSource<? extends T> source3, SingleSource<? extends T> source4) Flattens four Singles into a single Flowable, without any transformation, delaying any error(s) until all sources succeed or fail.
Flowable<T>	mergeWith(SingleSource<? extends T> other) Flattens this and another Single into a single Flowable, without any transformation.
static <T> Single<T>	never() Returns a singleton instance of a never-signaling Single (only calls onSubscribe).
Single<T>	observeOn(Scheduler scheduler) Modifies a Single to emit its item (or notify of its error) on a specified Scheduler, asynchronously.
Single<T>	onErrorResumeNext(Function<? super Throwable,? extends SingleSource<? extends T>> resumeFunctionInCaseOfError) Instructs a Single to pass control to another Single rather than invoking SingleObserver.onError(Throwable) if it encounters an error.
Single<T>	onErrorResumeWith(SingleSource<? extends T> resumeSingleInCaseOfError) Instructs a Single to pass control to another Single rather than invoking SingleObserver.onError(Throwable) if it encounters an error.
Single<T>	onErrorReturn(Function<Throwable,? extends T> resumeFunction) Instructs a Single to emit an item (returned by a specified function) rather than invoking onError if it encounters an error.
Single<T>	onErrorReturnItem(T value) Signals the specified value as success in case the current Single signals an error.
Single<T>	onTerminateDetach() Nulls out references to the upstream producer and downstream SingleObserver if the sequence is terminated or downstream calls dispose().
Flowable<T>	repeat() Repeatedly re-subscribes to the current Single and emits each success value.
Flowable<T>	repeat(long times) Re-subscribes to the current Single at most the given number of times and emits each success value.
Flowable<T>	repeatUntil(BooleanSupplier stop) Re-subscribes to the current Single until the given BooleanSupplier returns true.
Flowable<T>	repeatWhen(Function<? super Flowable<Object>,? extends Publisher<?>> handler) Re-subscribes to the current Single if the Publisher returned by the handler function signals a value in response to a value signalled through the Flowable the handle receives.
Single<T>	retry() Repeatedly re-subscribes to the current Single indefinitely if it fails with an onError.
Single<T>	retry(BiPredicate<? super Integer,? super Throwable> predicate) Re-subscribe to the current Single if the given predicate returns true when the Single fails with an onError.
Single<T>	retry(long times) Repeatedly re-subscribe at most the specified times to the current Single if it fails with an onError.
Single<T>	retry(long times, Predicate<? super Throwable> predicate) Repeatedly re-subscribe at most times or until the predicate returns false, whichever happens first if it fails with an onError.
Single<T>	retry(Predicate<? super Throwable> predicate) Re-subscribe to the current Single if the given predicate returns true when the Single fails with an onError.
Single<T>	retryWhen(Function<? super Flowable<Throwable>,? extends Publisher<?>> handler) Re-subscribes to the current Single if and when the Publisher returned by the handler function signals a value.
Disposable	subscribe() Subscribes to a Single but ignore its emission or notification.
Disposable	subscribe(BiConsumer<? super T,? super Throwable> onCallback) Subscribes to a Single and provides a composite callback to handle the item it emits or any error notification it issues.
Disposable	subscribe(Consumer<? super T> onSuccess) Subscribes to a Single and provides a callback to handle the item it emits.
Disposable	subscribe(Consumer<? super T> onSuccess, Consumer<? super Throwable> onError) Subscribes to a Single and provides callbacks to handle the item it emits or any error notification it issues.
void	subscribe(SingleObserver<? super T> observer) Subscribes the given SingleObserver to this SingleSource instance.
protected abstract void	subscribeActual(SingleObserver<? super T> observer) Implement this method in subclasses to handle the incoming SingleObservers.
Single<T>	subscribeOn(Scheduler scheduler) Asynchronously subscribes subscribers to this Single on the specified Scheduler.
<E extends SingleObserver<? super T>> E	subscribeWith(E observer) Subscribes a given SingleObserver (subclass) to this Single and returns the given SingleObserver as is.
Single<T>	takeUntil(CompletableSource other) Returns a Single that emits the item emitted by the source Single until a Completable terminates.
<E> Single<T>	takeUntil(Publisher<E> other) Returns a Single that emits the item emitted by the source Single until a Publisher emits an item.
<E> Single<T>	takeUntil(SingleSource<? extends E> other) Returns a Single that emits the item emitted by the source Single until a second Single emits an item.
TestObserver<T>	test() Creates a TestObserver and subscribes it to this Single.
TestObserver<T>	test(boolean dispose) Creates a TestObserver optionally in cancelled state, then subscribes it to this Single.
Single<T>	timeout(long timeout, TimeUnit unit) Signals a TimeoutException if the current Single doesn't signal a success value within the specified timeout window.
Single<T>	timeout(long timeout, TimeUnit unit, Scheduler scheduler) Signals a TimeoutException if the current Single doesn't signal a success value within the specified timeout window.
Single<T>	timeout(long timeout, TimeUnit unit, Scheduler scheduler, SingleSource<? extends T> other) Runs the current Single and if it doesn't signal within the specified timeout window, it is disposed and the other SingleSource subscribed to.
Single<T>	timeout(long timeout, TimeUnit unit, SingleSource<? extends T> other) Runs the current Single and if it doesn't signal within the specified timeout window, it is disposed and the other SingleSource subscribed to.
static Single<Long>	timer(long delay, TimeUnit unit) Signals success with 0L value after the given delay for each SingleObserver.
static Single<Long>	timer(long delay, TimeUnit unit, Scheduler scheduler) Signals success with 0L value after the given delay for each SingleObserver.
<R> R	to(SingleConverter<T,? extends R> converter) Calls the specified converter function during assembly time and returns its resulting value.
Flowable<T>	toFlowable() Converts this Single into a Flowable.
Future<T>	toFuture() Returns a Future representing the single value emitted by this Single.
Maybe<T>	toMaybe() Converts this Single into a Maybe.
Observable<T>	toObservable() Converts this Single into an Observable.
static <T> Single<T>	unsafeCreate(SingleSource<T> onSubscribe) Advanced use only: creates a Single instance without any safeguards by using a callback that is called with a SingleObserver.
Single<T>	unsubscribeOn(Scheduler scheduler) Returns a Single which makes sure when a SingleObserver disposes the Disposable, that call is propagated up on the specified scheduler.
static <T,U> Single<T>	using(Supplier<U> resourceSupplier, Function<? super U,? extends SingleSource<? extends T>> singleFunction, Consumer<? super U> disposer) Allows using and disposing a resource while running a SingleSource instance generated from that resource (similar to a try-with-resources).
static <T,U> Single<T>	using(Supplier<U> resourceSupplier, Function<? super U,? extends SingleSource<? extends T>> singleFunction, Consumer<? super U> disposer, boolean eager) Allows using and disposing a resource while running a SingleSource instance generated from that resource (similar to a try-with-resources).
static <T> Single<T>	wrap(SingleSource<T> source) Wraps a SingleSource instance into a new Single instance if not already a Single instance.
static <T,R> Single<R>	zip(Iterable<? extends SingleSource<? extends T>> sources, Function<? super Object[],? extends R> zipper) Waits until all SingleSource sources provided by the Iterable sequence signal a success value and calls a zipper function with an array of these values to return a result to be emitted to downstream.
static <T1,T2,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, BiFunction<? super T1,? super T2,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to two items emitted by two other Singles.
static <T1,T2,T3,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, Function3<? super T1,? super T2,? super T3,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to three items emitted by three other Singles.
static <T1,T2,T3,T4,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, SingleSource<? extends T4> source4, Function4<? super T1,? super T2,? super T3,? super T4,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to four items emitted by four other Singles.
static <T1,T2,T3,T4,T5,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, SingleSource<? extends T4> source4, SingleSource<? extends T5> source5, Function5<? super T1,? super T2,? super T3,? super T4,? super T5,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to five items emitted by five other Singles.
static <T1,T2,T3,T4,T5,T6,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, SingleSource<? extends T4> source4, SingleSource<? extends T5> source5, SingleSource<? extends T6> source6, Function6<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to six items emitted by six other Singles.
static <T1,T2,T3,T4,T5,T6,T7,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, SingleSource<? extends T4> source4, SingleSource<? extends T5> source5, SingleSource<? extends T6> source6, SingleSource<? extends T7> source7, Function7<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to seven items emitted by seven other Singles.
static <T1,T2,T3,T4,T5,T6,T7,T8,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, SingleSource<? extends T4> source4, SingleSource<? extends T5> source5, SingleSource<? extends T6> source6, SingleSource<? extends T7> source7, SingleSource<? extends T8> source8, Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to eight items emitted by eight other Singles.
static <T1,T2,T3,T4,T5,T6,T7,T8,T9,R> Single<R>	zip(SingleSource<? extends T1> source1, SingleSource<? extends T2> source2, SingleSource<? extends T3> source3, SingleSource<? extends T4> source4, SingleSource<? extends T5> source5, SingleSource<? extends T6> source6, SingleSource<? extends T7> source7, SingleSource<? extends T8> source8, SingleSource<? extends T9> source9, Function9<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? super T9,? extends R> zipper) Returns a Single that emits the results of a specified combiner function applied to nine items emitted by nine other Singles.
static <T,R> Single<R>	zipArray(Function<? super Object[],? extends R> zipper, SingleSource<? extends T>... sources) Waits until all SingleSource sources provided via an array signal a success value and calls a zipper function with an array of these values to return a result to be emitted to downstream.
<U,R> Single<R>	zipWith(SingleSource<U> other, BiFunction<? super T,? super U,? extends R> zipper) Returns a Single that emits the result of applying a specified function to the pair of items emitted by the source Single and another specified Single.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Single

public Single()

Method Detail

amb

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> amb(Iterable<? extends SingleSource<? extends T>> sources)

Runs multiple SingleSources and signals the events of the first one that signals (disposing the rest).

Scheduler:

amb does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the Iterable sequence of sources. A subscription to each source will occur in the same order as in this Iterable.

Returns:

the new Single instance

Since:

2.0

ambArray

@CheckReturnValue
 @SchedulerSupport(value="none")
public static <T> Single<T> ambArray(SingleSource<? extends T>... sources)

Runs multiple SingleSources and signals the events of the first one that signals (disposing the rest).

Scheduler:

ambArray does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the array of sources. A subscription to each source will occur in the same order as in this array.

Returns:

the new Single instance

Since:

2.0

concat

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
 @BackpressureSupport(value=FULL)
public static <T> Flowable<T> concat(Iterable<? extends SingleSource<? extends T>> sources)

Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by an Iterable sequence.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the Iterable sequence of SingleSource instances

Returns:

the new Flowable instance

Since:

2.0

concat

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Observable<T> concat(ObservableSource<? extends SingleSource<? extends T>> sources)

Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by an Observable sequence.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the ObservableSource of SingleSource instances

Returns:

the new Observable instance

Since:

2.0

concat

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concat(Publisher<? extends SingleSource<? extends T>> sources)

Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by a Publisher sequence.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer and the sources Publisher is expected to honor it as well.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the Publisher of SingleSource instances

Returns:

the new Flowable instance

Since:

2.0

concat

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concat(Publisher<? extends SingleSource<? extends T>> sources,
        int prefetch)

Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided by a Publisher sequence and prefetched by the specified amount.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer and the sources Publisher is expected to honor it as well.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the Publisher of SingleSource instances

prefetch - the number of SingleSources to prefetch from the Publisher

Returns:

the new Flowable instance

Since:

2.0

concat

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concat(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2)

Returns a Flowable that emits the items emitted by two Singles, one after the other.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the common value type

Parameters:

source1 - a Single to be concatenated

source2 - a Single to be concatenated

Returns:

a Flowable that emits items emitted by the two source Singles, one after the other.

See Also:

ReactiveX operators documentation: Concat

concat

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concat(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2,
        SingleSource<? extends T> source3)

Returns a Flowable that emits the items emitted by three Singles, one after the other.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the common value type

Parameters:

source1 - a Single to be concatenated

source2 - a Single to be concatenated

source3 - a Single to be concatenated

Returns:

a Flowable that emits items emitted by the three source Singles, one after the other.

See Also:

ReactiveX operators documentation: Concat

concat

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concat(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2,
        SingleSource<? extends T> source3,
        SingleSource<? extends T> source4)

Returns a Flowable that emits the items emitted by four Singles, one after the other.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

concat does not operate by default on a particular Scheduler.

Type Parameters:

T - the common value type

Parameters:

source1 - a Single to be concatenated

source2 - a Single to be concatenated

source3 - a Single to be concatenated

source4 - a Single to be concatenated

Returns:

a Flowable that emits items emitted by the four source Singles, one after the other.

See Also:

ReactiveX operators documentation: Concat

concatArray

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concatArray(SingleSource<? extends T>... sources)

Concatenate the single values, in a non-overlapping fashion, of the SingleSources provided in an array.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

concatArray does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - the array of SingleSource instances

Returns:

the new Flowable instance

Since:

2.0

concatArrayEager

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concatArrayEager(SingleSource<? extends T>... sources)

Concatenates a sequence of SingleSource eagerly into a single stream of values.

Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the source SingleSources. The operator buffers the value emitted by these SingleSources and then drains them in order, each one after the previous one completes.

Backpressure:

The operator honors backpressure from downstream.

Scheduler:

This method does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - a sequence of Single that need to be eagerly concatenated

Returns:

the new Flowable instance with the specified concatenation behavior

concatEager

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concatEager(Publisher<? extends SingleSource<? extends T>> sources)

Concatenates a Publisher sequence of SingleSources eagerly into a single stream of values.

Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the emitted source Publishers as they are observed. The operator buffers the values emitted by these Publishers and then drains them in order, each one after the previous one completes.

Backpressure:

Backpressure is honored towards the downstream and the outer Publisher is expected to support backpressure. Violating this assumption, the operator will signal MissingBackpressureException.

Scheduler:

This method does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - a sequence of Publishers that need to be eagerly concatenated

Returns:

the new Publisher instance with the specified concatenation behavior

concatEager

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Flowable<T> concatEager(Iterable<? extends SingleSource<? extends T>> sources)

Concatenates a sequence of SingleSources eagerly into a single stream of values.

Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the source SingleSources. The operator buffers the values emitted by these SingleSources and then drains them in order, each one after the previous one completes.

Backpressure:

Backpressure is honored towards the downstream.

Scheduler:

This method does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

sources - a sequence of SingleSource that need to be eagerly concatenated

Returns:

the new Flowable instance with the specified concatenation behavior

create

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> create(SingleOnSubscribe<T> source)

Provides an API (via a cold Single) that bridges the reactive world with the callback-style world.

Example:

 Single.<Event>create(emitter -> {
     Callback listener = new Callback() {
         @Override
         public void onEvent(Event e) {
             emitter.onSuccess(e);
         }

         @Override
         public void onFailure(Exception e) {
             emitter.onError(e);
         }
     };

     AutoCloseable c = api.someMethod(listener);

     emitter.setCancellable(c::close);

 });
 

Whenever a SingleObserver subscribes to the returned Single, the provided SingleOnSubscribe callback is invoked with a fresh instance of a SingleEmitter that will interact only with that specific SingleObserver. If this SingleObserver disposes the flow (making SingleEmitter.isDisposed() return true), other observers subscribed to the same returned Single are not affected.

Scheduler:

create does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

source - the emitter that is called when a SingleObserver subscribes to the returned Single

Returns:

the new Single instance

See Also:

SingleOnSubscribe, Cancellable

defer

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> defer(Supplier<? extends SingleSource<? extends T>> singleSupplier)

Calls a Supplier for each individual SingleObserver to return the actual SingleSource to be subscribed to.

Scheduler:

defer does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

singleSupplier - the Supplier that is called for each individual SingleObserver and returns a SingleSource instance to subscribe to

Returns:

the new Single instance

error

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> error(Supplier<? extends Throwable> errorSupplier)

Signals a Throwable returned by the callback function for each individual SingleObserver.

Scheduler:

error does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

errorSupplier - the Supplier that is called for each individual SingleObserver and returns a Throwable instance to be emitted.

Returns:

the new Single instance

error

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> error(Throwable exception)

Returns a Single that invokes a subscriber's onError method when the subscriber subscribes to it.

Scheduler:

error does not operate by default on a particular Scheduler.

Type Parameters:

T - the type of the item (ostensibly) emitted by the Single

Parameters:

exception - the particular Throwable to pass to onError

Returns:

a Single that invokes the subscriber's onError method when the subscriber subscribes to it

See Also:

ReactiveX operators documentation: Throw

fromCallable

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> fromCallable(Callable<? extends T> callable)

Returns a Single that invokes passed function and emits its result for each new SingleObserver that subscribes.

Allows you to defer execution of passed function until SingleObserver subscribes to the Single. It makes passed function "lazy". Result of the function invocation will be emitted by the Single.

Scheduler:

fromCallable does not operate by default on a particular Scheduler.

Error handling:

If the Callable throws an exception, the respective Throwable is delivered to the downstream via SingleObserver.onError(Throwable), except when the downstream has disposed this Single source. In this latter case, the Throwable is delivered to the global error handler via RxJavaPlugins.onError(Throwable) as an UndeliverableException.

Type Parameters:

T - the type of the item emitted by the Single.

Parameters:

callable - function which execution should be deferred, it will be invoked when SingleObserver will subscribe to the Single.

Returns:

a Single whose SingleObservers' subscriptions trigger an invocation of the given function.

See Also:

defer(Supplier), fromSupplier(Supplier)

fromFuture

@CheckReturnValue
 @SchedulerSupport(value="none")
public static <T> Single<T> fromFuture(Future<? extends T> future)

Converts a Future into a Single.

You can convert any object that supports the Future interface into a Single that emits the return value of the Future.get() method of that object, by passing the object into the from method.

Important note: This Single is blocking; you cannot dispose it.

Scheduler:

fromFuture does not operate by default on a particular Scheduler.

Type Parameters:

T - the type of object that the Future returns, and also the type of item to be emitted by the resulting Single

Parameters:

future - the source Future

Returns:

a Single that emits the item from the source Future

See Also:

ReactiveX operators documentation: From

fromFuture

@CheckReturnValue
 @SchedulerSupport(value="none")
public static <T> Single<T> fromFuture(Future<? extends T> future,
        long timeout,
        TimeUnit unit)

Converts a Future into a Single, with a timeout on the Future.

You can convert any object that supports the Future interface into a Single that emits the return value of the Future.get() method of that object, by passing the object into the from method.

Important note: This Single is blocking; you cannot dispose it.

Scheduler:

fromFuture does not operate by default on a particular Scheduler.

Type Parameters:

T - the type of object that the Future returns, and also the type of item to be emitted by the resulting Single

Parameters:

future - the source Future

timeout - the maximum time to wait before calling get

unit - the TimeUnit of the timeout argument

Returns:

a Single that emits the item from the source Future

See Also:

ReactiveX operators documentation: From

fromFuture

@CheckReturnValue
 @SchedulerSupport(value="custom")
public static <T> Single<T> fromFuture(Future<? extends T> future,
        long timeout,
        TimeUnit unit,
        Scheduler scheduler)

Converts a Future into a Single, with a timeout on the Future.

You can convert any object that supports the Future interface into a Single that emits the return value of the Future.get() method of that object, by passing the object into the from method.

Important note: This Single is blocking; you cannot dispose it.

Scheduler:

You specify the Scheduler where the blocking wait will happen.

Type Parameters:

T - the type of object that the Future returns, and also the type of item to be emitted by the resulting Single

Parameters:

future - the source Future

timeout - the maximum time to wait before calling get

unit - the TimeUnit of the timeout argument

scheduler - the Scheduler to use for the blocking wait

Returns:

a Single that emits the item from the source Future

See Also:

ReactiveX operators documentation: From

fromFuture

@CheckReturnValue
 @SchedulerSupport(value="custom")
public static <T> Single<T> fromFuture(Future<? extends T> future,
        Scheduler scheduler)

Converts a Future, operating on a specified Scheduler, into a Single.

You can convert any object that supports the Future interface into a Single that emits the return value of the Future.get() method of that object, by passing the object into the from method.

Scheduler:

You specify which Scheduler this operator will use.

Type Parameters:

T - the type of object that the Future returns, and also the type of item to be emitted by the resulting Single

Parameters:

future - the source Future

scheduler - the Scheduler to wait for the Future on. Use a Scheduler such as Schedulers.io() that can block and wait on the Future

Returns:

a Single that emits the item from the source Future

See Also:

ReactiveX operators documentation: From

fromPublisher

@BackpressureSupport(value=UNBOUNDED_IN)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> fromPublisher(Publisher<? extends T> publisher)

Wraps a specific Publisher into a Single and signals its single element or error.

If the source Publisher is empty, a NoSuchElementException is signalled. If the source has more than one element, an IndexOutOfBoundsException is signalled.

The Publisher must follow the Reactive-Streams specification. Violating the specification may result in undefined behavior.

If possible, use create(SingleOnSubscribe) to create a source-like Single instead.

Note that even though Publisher appears to be a functional interface, it is not recommended to implement it through a lambda as the specification requires state management that is not achievable with a stateless lambda.

Backpressure:

The publisher is consumed in an unbounded fashion but will be cancelled if it produced more than one item.

Scheduler:

fromPublisher does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

publisher - the source Publisher instance, not null

Returns:

the new Single instance

See Also:

create(SingleOnSubscribe)

fromObservable

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> fromObservable(ObservableSource<? extends T> observableSource)

Wraps a specific ObservableSource into a Single and signals its single element or error.

If the ObservableSource is empty, a NoSuchElementException is signalled. If the source has more than one element, an IndexOutOfBoundsException is signalled.

Scheduler:

fromObservable does not operate by default on a particular Scheduler.

Type Parameters:

T - the type of the item emitted by the Single.

Parameters:

observableSource - the source Observable, not null

Returns:

the new Single instance

fromSupplier

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> fromSupplier(Supplier<? extends T> supplier)

Returns a Single that invokes passed supplierfunction and emits its result for each new SingleObserver that subscribes.

Allows you to defer execution of passed function until SingleObserver subscribes to the Single. It makes passed function "lazy". Result of the function invocation will be emitted by the Single.

Scheduler:

fromSupplier does not operate by default on a particular Scheduler.

Error handling:

If the Supplier throws an exception, the respective Throwable is delivered to the downstream via SingleObserver.onError(Throwable), except when the downstream has disposed this Single source. In this latter case, the Throwable is delivered to the global error handler via RxJavaPlugins.onError(Throwable) as an UndeliverableException.

Type Parameters:

T - the type of the item emitted by the Single.

Parameters:

supplier - function which execution should be deferred, it will be invoked when SingleObserver will subscribe to the Single.

Returns:

a Single whose SingleObservers' subscriptions trigger an invocation of the given function.

Since:

3.0.0

See Also:

defer(Supplier), fromCallable(Callable)

just

@CheckReturnValue
 @SchedulerSupport(value="none")
 @NonNull
public static <T> Single<T> just(T item)

Returns a Single that emits a specified item.

To convert any object into a Single that emits that object, pass that object into the just method.

Scheduler:

just does not operate by default on a particular Scheduler.

Type Parameters:

T - the type of that item

Parameters:

item - the item to emit

Returns:

a Single that emits item

See Also:

ReactiveX operators documentation: Just

merge

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> merge(Iterable<? extends SingleSource<? extends T>> sources)

Merges an Iterable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

merge does not operate by default on a particular Scheduler.

Error handling:

If any of the source SingleSources signal a Throwable via onError, the resulting Flowable terminates with that Throwable and all other source SingleSources are disposed. If more than one SingleSource signals an error, the resulting Flowable may terminate with the first one's error or, depending on the concurrency of the sources, may terminate with a CompositeException containing two or more of the various error signals. Throwables that didn't make into the composite will be sent (individually) to the global error handler via RxJavaPlugins.onError(Throwable) method as UndeliverableException errors. Similarly, Throwables signaled by source(s) after the returned Flowable has been cancelled or terminated with a (composite) error will be sent to the same global error handler. Use mergeDelayError(Iterable) to merge sources and terminate only when all source SingleSources have completed or failed with an error.

Type Parameters:

T - the common and resulting value type

Parameters:

sources - the Iterable sequence of SingleSource sources

Returns:

the new Flowable instance

Since:

2.0

See Also:

mergeDelayError(Iterable)

merge

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> merge(Publisher<? extends SingleSource<? extends T>> sources)

Merges a Flowable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

merge does not operate by default on a particular Scheduler.

Error handling:

If any of the source SingleSources signal a Throwable via onError, the resulting Flowable terminates with that Throwable and all other source SingleSources are disposed. If more than one SingleSource signals an error, the resulting Flowable may terminate with the first one's error or, depending on the concurrency of the sources, may terminate with a CompositeException containing two or more of the various error signals. Throwables that didn't make into the composite will be sent (individually) to the global error handler via RxJavaPlugins.onError(Throwable) method as UndeliverableException errors. Similarly, Throwables signaled by source(s) after the returned Flowable has been cancelled or terminated with a (composite) error will be sent to the same global error handler. Use mergeDelayError(Publisher) to merge sources and terminate only when all source SingleSources have completed or failed with an error.

Type Parameters:

T - the common and resulting value type

Parameters:

sources - the Flowable sequence of SingleSource sources

Returns:

the new Flowable instance

Since:

2.0

See Also:

mergeDelayError(Publisher)

merge

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> merge(SingleSource<? extends SingleSource<? extends T>> source)

Flattens a Single that emits a Single into a single Single that emits the item emitted by the nested Single, without any transformation.

Scheduler:

merge does not operate by default on a particular Scheduler.

The resulting Single emits the outer source's or the inner SingleSource's Throwable as is. Unlike the other merge() operators, this operator won't and can't produce a CompositeException because there is only one possibility for the outer or the inner SingleSource to emit an onError signal. Therefore, there is no need for a mergeDelayError(SingleSource<SingleSource<T>>) operator.

Type Parameters:

T - the value type of the sources and the output

Parameters:

source - a Single that emits a Single

Returns:

a Single that emits the item that is the result of flattening the Single emitted by source

See Also:

ReactiveX operators documentation: Merge

merge

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> merge(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2)

Flattens two Singles into a single Flowable, without any transformation.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the merge method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

merge does not operate by default on a particular Scheduler.

Error handling:

If any of the source SingleSources signal a Throwable via onError, the resulting Flowable terminates with that Throwable and all other source SingleSources are disposed. If more than one SingleSource signals an error, the resulting Flowable may terminate with the first one's error or, depending on the concurrency of the sources, may terminate with a CompositeException containing two or more of the various error signals. Throwables that didn't make into the composite will be sent (individually) to the global error handler via RxJavaPlugins.onError(Throwable) method as UndeliverableException errors. Similarly, Throwables signaled by source(s) after the returned Flowable has been cancelled or terminated with a (composite) error will be sent to the same global error handler. Use mergeDelayError(SingleSource, SingleSource) to merge sources and terminate only when all source SingleSources have completed or failed with an error.

Type Parameters:

T - the common value type

Parameters:

source1 - a SingleSource to be merged

source2 - a SingleSource to be merged

Returns:

a Flowable that emits all of the items emitted by the source Singles

See Also:

ReactiveX operators documentation: Merge, mergeDelayError(SingleSource, SingleSource)

merge

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> merge(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2,
        SingleSource<? extends T> source3)

Flattens three Singles into a single Flowable, without any transformation.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the merge method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

merge does not operate by default on a particular Scheduler.

Error handling:

If any of the source SingleSources signal a Throwable via onError, the resulting Flowable terminates with that Throwable and all other source SingleSources are disposed. If more than one SingleSource signals an error, the resulting Flowable may terminate with the first one's error or, depending on the concurrency of the sources, may terminate with a CompositeException containing two or more of the various error signals. Throwables that didn't make into the composite will be sent (individually) to the global error handler via RxJavaPlugins.onError(Throwable) method as UndeliverableException errors. Similarly, Throwables signaled by source(s) after the returned Flowable has been cancelled or terminated with a (composite) error will be sent to the same global error handler. Use mergeDelayError(SingleSource, SingleSource, SingleSource) to merge sources and terminate only when all source SingleSources have completed or failed with an error.

Type Parameters:

T - the common value type

Parameters:

source1 - a SingleSource to be merged

source2 - a SingleSource to be merged

source3 - a SingleSource to be merged

Returns:

a Flowable that emits all of the items emitted by the source Singles

See Also:

ReactiveX operators documentation: Merge, mergeDelayError(SingleSource, SingleSource, SingleSource)

merge

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> merge(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2,
        SingleSource<? extends T> source3,
        SingleSource<? extends T> source4)

Flattens four Singles into a single Flowable, without any transformation.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the merge method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

merge does not operate by default on a particular Scheduler.

Error handling:

If any of the source SingleSources signal a Throwable via onError, the resulting Flowable terminates with that Throwable and all other source SingleSources are disposed. If more than one SingleSource signals an error, the resulting Flowable may terminate with the first one's error or, depending on the concurrency of the sources, may terminate with a CompositeException containing two or more of the various error signals. Throwables that didn't make into the composite will be sent (individually) to the global error handler via RxJavaPlugins.onError(Throwable) method as UndeliverableException errors. Similarly, Throwables signaled by source(s) after the returned Flowable has been cancelled or terminated with a (composite) error will be sent to the same global error handler. Use mergeDelayError(SingleSource, SingleSource, SingleSource, SingleSource) to merge sources and terminate only when all source SingleSources have completed or failed with an error.

Type Parameters:

T - the common value type

Parameters:

source1 - a SingleSource to be merged

source2 - a SingleSource to be merged

source3 - a SingleSource to be merged

source4 - a SingleSource to be merged

Returns:

a Flowable that emits all of the items emitted by the source Singles

See Also:

ReactiveX operators documentation: Merge, mergeDelayError(SingleSource, SingleSource, SingleSource, SingleSource)

mergeDelayError

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> mergeDelayError(Iterable<? extends SingleSource<? extends T>> sources)

Merges an Iterable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once and delaying any error(s) until all sources succeed or fail.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

mergeDelayError does not operate by default on a particular Scheduler.

History: 2.1.9 - experimental

Type Parameters:

T - the common and resulting value type

Parameters:

sources - the Iterable sequence of SingleSource sources

Returns:

the new Flowable instance

Since:

2.2

See Also:

merge(Iterable)

mergeDelayError

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> mergeDelayError(Publisher<? extends SingleSource<? extends T>> sources)

Merges a Flowable sequence of SingleSource instances into a single Flowable sequence, running all SingleSources at once and delaying any error(s) until all sources succeed or fail.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

mergeDelayError does not operate by default on a particular Scheduler.

History: 2.1.9 - experimental

Type Parameters:

T - the common and resulting value type

Parameters:

sources - the Flowable sequence of SingleSource sources

Returns:

the new Flowable instance

Since:

2.2

See Also:

merge(Publisher)

mergeDelayError

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> mergeDelayError(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2)

Flattens two Singles into a single Flowable, without any transformation, delaying any error(s) until all sources succeed or fail.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the mergeDelayError method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

mergeDelayError does not operate by default on a particular Scheduler.

History: 2.1.9 - experimental

Type Parameters:

T - the common value type

Parameters:

source1 - a SingleSource to be merged

source2 - a SingleSource to be merged

Returns:

a Flowable that emits all of the items emitted by the source Singles

Since:

2.2

See Also:

ReactiveX operators documentation: Merge, merge(SingleSource, SingleSource)

mergeDelayError

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> mergeDelayError(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2,
        SingleSource<? extends T> source3)

Flattens three Singles into a single Flowable, without any transformation, delaying any error(s) until all sources succeed or fail.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the mergeDelayError method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

mergeDelayError does not operate by default on a particular Scheduler.

History: 2.1.9 - experimental

Type Parameters:

T - the common value type

Parameters:

source1 - a SingleSource to be merged

source2 - a SingleSource to be merged

source3 - a SingleSource to be merged

Returns:

a Flowable that emits all of the items emitted by the source Singles

Since:

2.2

See Also:

ReactiveX operators documentation: Merge, merge(SingleSource, SingleSource, SingleSource)

mergeDelayError

@CheckReturnValue
 @NonNull
 @BackpressureSupport(value=FULL)
 @SchedulerSupport(value="none")
public static <T> Flowable<T> mergeDelayError(SingleSource<? extends T> source1,
        SingleSource<? extends T> source2,
        SingleSource<? extends T> source3,
        SingleSource<? extends T> source4)

Flattens four Singles into a single Flowable, without any transformation, delaying any error(s) until all sources succeed or fail.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the mergeDelayError method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

mergeDelayError does not operate by default on a particular Scheduler.

History: 2.1.9 - experimental

Type Parameters:

T - the common value type

Parameters:

source1 - a SingleSource to be merged

source2 - a SingleSource to be merged

source3 - a SingleSource to be merged

source4 - a SingleSource to be merged

Returns:

a Flowable that emits all of the items emitted by the source Singles

Since:

2.2

See Also:

ReactiveX operators documentation: Merge, merge(SingleSource, SingleSource, SingleSource, SingleSource)

never

@CheckReturnValue
 @SchedulerSupport(value="none")
public static <T> Single<T> never()

Returns a singleton instance of a never-signaling Single (only calls onSubscribe).

Scheduler:

never does not operate by default on a particular Scheduler.

Type Parameters:

T - the target value type

Returns:

the singleton never instance

Since:

2.0

timer

@CheckReturnValue
 @SchedulerSupport(value="io.reactivex:computation")
public static Single<Long> timer(long delay,
        TimeUnit unit)

Signals success with 0L value after the given delay for each SingleObserver.

Scheduler:

timer operates by default on the computation Scheduler.

Parameters:

delay - the delay amount

unit - the time unit of the delay

Returns:

the new Single instance

Since:

2.0

timer

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="custom")
public static Single<Long> timer(long delay,
        TimeUnit unit,
        Scheduler scheduler)

Signals success with 0L value after the given delay for each SingleObserver.

Scheduler:

you specify the Scheduler to signal on.

Parameters:

delay - the delay amount

unit - the time unit of the delay

scheduler - the scheduler where the single 0L will be emitted

Returns:

the new Single instance

Throws:

NullPointerException - if unit is null, or if scheduler is null

Since:

2.0

equals

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<Boolean> equals(SingleSource<? extends T> first,
        SingleSource<? extends T> second)

Compares two SingleSources and emits true if they emit the same value (compared via Object.equals).

Scheduler:

equals does not operate by default on a particular Scheduler.

Type Parameters:

T - the common value type

Parameters:

first - the first SingleSource instance

second - the second SingleSource instance

Returns:

the new Single instance

Since:

2.0

unsafeCreate

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> unsafeCreate(SingleSource<T> onSubscribe)

Advanced use only: creates a Single instance without any safeguards by using a callback that is called with a SingleObserver.

Scheduler:

unsafeCreate does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

onSubscribe - the function that is called with the subscribing SingleObserver

Returns:

the new Single instance

Throws:

IllegalArgumentException - if source is a subclass of Single; such instances don't need conversion and is possibly a port remnant from 1.x or one should use hide() instead.

Since:

2.0

using

@CheckReturnValue
 @SchedulerSupport(value="none")
public static <T,U> Single<T> using(Supplier<U> resourceSupplier,
        Function<? super U,? extends SingleSource<? extends T>> singleFunction,
        Consumer<? super U> disposer)

Allows using and disposing a resource while running a SingleSource instance generated from that resource (similar to a try-with-resources).

Scheduler:

using does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type of the SingleSource generated

U - the resource type

Parameters:

resourceSupplier - the Supplier called for each SingleObserver to generate a resource Object

singleFunction - the function called with the returned resource Object from resourceSupplier and should return a SingleSource instance to be run by the operator

disposer - the consumer of the generated resource that is called exactly once for that particular resource when the generated SingleSource terminates (successfully or with an error) or gets disposed.

Returns:

the new Single instance

Since:

2.0

using

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T,U> Single<T> using(Supplier<U> resourceSupplier,
        Function<? super U,? extends SingleSource<? extends T>> singleFunction,
        Consumer<? super U> disposer,
        boolean eager)

Allows using and disposing a resource while running a SingleSource instance generated from that resource (similar to a try-with-resources).

Scheduler:

using does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type of the SingleSource generated

U - the resource type

Parameters:

resourceSupplier - the Supplier called for each SingleObserver to generate a resource Object

singleFunction - the function called with the returned resource Object from resourceSupplier and should return a SingleSource instance to be run by the operator

disposer - the consumer of the generated resource that is called exactly once for that particular resource when the generated SingleSource terminates (successfully or with an error) or gets disposed.

eager - If true then resource disposal will happen either on a dispose() call before the upstream is disposed or just before the emission of a terminal event (onSuccess or onError). If false the resource disposal will happen either on a dispose() call after the upstream is disposed or just after the emission of a terminal event (onSuccess or onError).

Returns:

the new Single instance

Since:

2.0

wrap

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T> Single<T> wrap(SingleSource<T> source)

Wraps a SingleSource instance into a new Single instance if not already a Single instance.

Scheduler:

wrap does not operate by default on a particular Scheduler.

Type Parameters:

T - the value type

Parameters:

source - the source to wrap

Returns:

the Single wrapper or the source cast to Single (if possible)

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T,R> Single<R> zip(Iterable<? extends SingleSource<? extends T>> sources,
        Function<? super Object[],? extends R> zipper)

Waits until all SingleSource sources provided by the Iterable sequence signal a success value and calls a zipper function with an array of these values to return a result to be emitted to downstream.

If the Iterable of SingleSources is empty a NoSuchElementException error is signalled after subscription.

Note on method signature: since Java doesn't allow creating a generic array with new T[], the implementation of this operator has to create an Object[] instead. Unfortunately, a Function<Integer[], R> passed to the method would trigger a ClassCastException.

If any of the SingleSources signal an error, all other SingleSources get disposed and the error emitted to downstream immediately.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T - the common value type

R - the result value type

Parameters:

sources - the Iterable sequence of SingleSource instances. An empty sequence will result in an onError signal of NoSuchElementException.

zipper - the function that receives an array with values from each SingleSource and should return a value to be emitted to downstream

Returns:

the new Single instance

Since:

2.0

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        BiFunction<? super T1,? super T2,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to two items emitted by two other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        Function3<? super T1,? super T2,? super T3,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to three items emitted by three other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,T4,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        SingleSource<? extends T4> source4,
        Function4<? super T1,? super T2,? super T3,? super T4,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to four items emitted by four other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

T4 - the fourth source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

source4 - a fourth source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,T4,T5,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        SingleSource<? extends T4> source4,
        SingleSource<? extends T5> source5,
        Function5<? super T1,? super T2,? super T3,? super T4,? super T5,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to five items emitted by five other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

T4 - the fourth source Single's value type

T5 - the fifth source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

source4 - a fourth source Single

source5 - a fifth source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,T4,T5,T6,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        SingleSource<? extends T4> source4,
        SingleSource<? extends T5> source5,
        SingleSource<? extends T6> source6,
        Function6<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to six items emitted by six other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

T4 - the fourth source Single's value type

T5 - the fifth source Single's value type

T6 - the sixth source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

source4 - a fourth source Single

source5 - a fifth source Single

source6 - a sixth source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,T4,T5,T6,T7,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        SingleSource<? extends T4> source4,
        SingleSource<? extends T5> source5,
        SingleSource<? extends T6> source6,
        SingleSource<? extends T7> source7,
        Function7<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to seven items emitted by seven other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

T4 - the fourth source Single's value type

T5 - the fifth source Single's value type

T6 - the sixth source Single's value type

T7 - the seventh source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

source4 - a fourth source Single

source5 - a fifth source Single

source6 - a sixth source Single

source7 - a seventh source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,T4,T5,T6,T7,T8,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        SingleSource<? extends T4> source4,
        SingleSource<? extends T5> source5,
        SingleSource<? extends T6> source6,
        SingleSource<? extends T7> source7,
        SingleSource<? extends T8> source8,
        Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to eight items emitted by eight other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

T4 - the fourth source Single's value type

T5 - the fifth source Single's value type

T6 - the sixth source Single's value type

T7 - the seventh source Single's value type

T8 - the eighth source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

source4 - a fourth source Single

source5 - a fifth source Single

source6 - a sixth source Single

source7 - a seventh source Single

source8 - an eighth source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zip

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T1,T2,T3,T4,T5,T6,T7,T8,T9,R> Single<R> zip(SingleSource<? extends T1> source1,
        SingleSource<? extends T2> source2,
        SingleSource<? extends T3> source3,
        SingleSource<? extends T4> source4,
        SingleSource<? extends T5> source5,
        SingleSource<? extends T6> source6,
        SingleSource<? extends T7> source7,
        SingleSource<? extends T8> source8,
        SingleSource<? extends T9> source9,
        Function9<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? super T9,? extends R> zipper)

Returns a Single that emits the results of a specified combiner function applied to nine items emitted by nine other Singles.

Scheduler:

zip does not operate by default on a particular Scheduler.

Type Parameters:

T1 - the first source Single's value type

T2 - the second source Single's value type

T3 - the third source Single's value type

T4 - the fourth source Single's value type

T5 - the fifth source Single's value type

T6 - the sixth source Single's value type

T7 - the seventh source Single's value type

T8 - the eighth source Single's value type

T9 - the ninth source Single's value type

R - the result value type

Parameters:

source1 - the first source Single

source2 - a second source Single

source3 - a third source Single

source4 - a fourth source Single

source5 - a fifth source Single

source6 - a sixth source Single

source7 - a seventh source Single

source8 - an eighth source Single

source9 - a ninth source Single

zipper - a function that, when applied to the item emitted by each of the source Singles, results in an item that will be emitted by the resulting Single

Returns:

a Single that emits the zipped results

See Also:

ReactiveX operators documentation: Zip

zipArray

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public static <T,R> Single<R> zipArray(Function<? super Object[],? extends R> zipper,
        SingleSource<? extends T>... sources)

Waits until all SingleSource sources provided via an array signal a success value and calls a zipper function with an array of these values to return a result to be emitted to downstream.

If the array of SingleSources is empty a NoSuchElementException error is signalled immediately.

Note on method signature: since Java doesn't allow creating a generic array with new T[], the implementation of this operator has to create an Object[] instead. Unfortunately, a Function<Integer[], R> passed to the method would trigger a ClassCastException.

If any of the SingleSources signal an error, all other SingleSources get disposed and the error emitted to downstream immediately.

Scheduler:

zipArray does not operate by default on a particular Scheduler.

Type Parameters:

T - the common value type

R - the result value type

Parameters:

sources - the array of SingleSource instances. An empty sequence will result in an onError signal of NoSuchElementException.

zipper - the function that receives an array with values from each SingleSource and should return a value to be emitted to downstream

Returns:

the new Single instance

Since:

2.0

ambWith

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> ambWith(SingleSource<? extends T> other)

Signals the event of this or the other SingleSource whichever signals first.

Scheduler:

ambWith does not operate by default on a particular Scheduler.

Parameters:

other - the other SingleSource to race for the first emission of success or error

Returns:

the new Single instance. A subscription to this provided source will occur after subscribing to the current source.

Since:

2.0

hide

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> hide()

Hides the identity of the current Single, including the Disposable that is sent to the downstream via onSubscribe().

Scheduler:

hide does not operate by default on a particular Scheduler.

Returns:

the new Single instance

Since:

2.0

compose

@CheckReturnValue
 @SchedulerSupport(value="none")
public final <R> Single<R> compose(SingleTransformer<? super T,? extends R> transformer)

Transform a Single by applying a particular Transformer function to it.

This method operates on the Single itself whereas lift(io.reactivex.rxjava3.core.SingleOperator<? extends R, ? super T>) operates on the Single's SingleObservers.

If the operator you are creating is designed to act on the individual item emitted by a Single, use lift(io.reactivex.rxjava3.core.SingleOperator<? extends R, ? super T>). If your operator is designed to transform the source Single as a whole (for instance, by applying a particular set of existing RxJava operators to it) use compose.

Scheduler:

compose does not operate by default on a particular Scheduler.

Type Parameters:

R - the value type of the single returned by the transformer function

Parameters:

transformer - the transformer function, not null

Returns:

the source Single, transformed by the transformer function

See Also:

RxJava wiki: Implementing Your Own Operators

cache

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> cache()

Stores the success value or exception from the current Single and replays it to late SingleObservers.

The returned Single subscribes to the current Single when the first SingleObserver subscribes.

Scheduler:

cache does not operate by default on a particular Scheduler.

Returns:

the new Single instance

Since:

2.0

cast

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <U> Single<U> cast(Class<? extends U> clazz)

Casts the success value of the current Single into the target type or signals a ClassCastException if not compatible.

Scheduler:

cast does not operate by default on a particular Scheduler.

Type Parameters:

U - the target type

Parameters:

clazz - the type token to use for casting the success result from the current Single

Returns:

the new Single instance

Since:

2.0

concatWith

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> concatWith(SingleSource<? extends T> other)

Returns a Flowable that emits the item emitted by the source Single, then the item emitted by the specified Single.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

concatWith does not operate by default on a particular Scheduler.

Parameters:

other - a Single to be concatenated after the current

Returns:

a Flowable that emits the item emitted by the source Single, followed by the item emitted by t1

See Also:

ReactiveX operators documentation: Concat

delay

@CheckReturnValue
 @SchedulerSupport(value="io.reactivex:computation")
public final Single<T> delay(long time,
        TimeUnit unit)

Delays the emission of the success signal from the current Single by the specified amount. An error signal will not be delayed.

Scheduler:

delay operates by default on the computation Scheduler.

Parameters:

time - the amount of time the success signal should be delayed for

unit - the time unit

Returns:

the new Single instance

Since:

2.0

delay

@CheckReturnValue
 @SchedulerSupport(value="io.reactivex:computation")
public final Single<T> delay(long time,
        TimeUnit unit,
        boolean delayError)

Delays the emission of the success or error signal from the current Single by the specified amount.

Scheduler:

delay operates by default on the computation Scheduler.

History: 2.1.5 - experimental

Parameters:

time - the amount of time the success or error signal should be delayed for

unit - the time unit

delayError - if true, both success and error signals are delayed. if false, only success signals are delayed.

Returns:

the new Single instance

Since:

2.2

delay

@CheckReturnValue
 @SchedulerSupport(value="custom")
public final Single<T> delay(long time,
        TimeUnit unit,
        Scheduler scheduler)

Delays the emission of the success signal from the current Single by the specified amount. An error signal will not be delayed.

Scheduler:

you specify the Scheduler where the non-blocking wait and emission happens

Parameters:

time - the amount of time the success signal should be delayed for

unit - the time unit

scheduler - the target scheduler to use for the non-blocking wait and emission

Returns:

the new Single instance

Throws:

NullPointerException - if unit is null, or if scheduler is null

Since:

2.0

delay

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="custom")
public final Single<T> delay(long time,
        TimeUnit unit,
        Scheduler scheduler,
        boolean delayError)

Delays the emission of the success or error signal from the current Single by the specified amount.

Scheduler:

you specify the Scheduler where the non-blocking wait and emission happens

History: 2.1.5 - experimental

Parameters:

time - the amount of time the success or error signal should be delayed for

unit - the time unit

scheduler - the target scheduler to use for the non-blocking wait and emission

delayError - if true, both success and error signals are delayed. if false, only success signals are delayed.

Returns:

the new Single instance

Throws:

NullPointerException - if unit is null, or if scheduler is null

Since:

2.2

delaySubscription

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> delaySubscription(CompletableSource other)

Delays the actual subscription to the current Single until the given other CompletableSource completes.

If the delaying source signals an error, that error is re-emitted and no subscription to the current Single happens.

Scheduler:

delaySubscription does not operate by default on a particular Scheduler.

Parameters:

other - the CompletableSource that has to complete before the subscription to the current Single happens

Returns:

the new Single instance

Since:

2.0

delaySubscription

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <U> Single<T> delaySubscription(SingleSource<U> other)

Delays the actual subscription to the current Single until the given other SingleSource signals success.

If the delaying source signals an error, that error is re-emitted and no subscription to the current Single happens.

Scheduler:

delaySubscription does not operate by default on a particular Scheduler.

Type Parameters:

U - the element type of the other source

Parameters:

other - the SingleSource that has to complete before the subscription to the current Single happens

Returns:

the new Single instance

Since:

2.0

delaySubscription

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <U> Single<T> delaySubscription(ObservableSource<U> other)

Delays the actual subscription to the current Single until the given other ObservableSource signals its first value or completes.

If the delaying source signals an error, that error is re-emitted and no subscription to the current Single happens.

Scheduler:

delaySubscription does not operate by default on a particular Scheduler.

Type Parameters:

U - the element type of the other source

Parameters:

other - the ObservableSource that has to signal a value or complete before the subscription to the current Single happens

Returns:

the new Single instance

Since:

2.0

delaySubscription

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <U> Single<T> delaySubscription(Publisher<U> other)

Delays the actual subscription to the current Single until the given other Publisher signals its first value or completes.

If the delaying source signals an error, that error is re-emitted and no subscription to the current Single happens.

The other source is consumed in an unbounded manner (requesting Long.MAX_VALUE from it).

Backpressure:

The other publisher is consumed in an unbounded fashion but will be cancelled after the first item it produced.

Scheduler:

delaySubscription does not operate by default on a particular Scheduler.

Type Parameters:

U - the element type of the other source

Parameters:

other - the Publisher that has to signal a value or complete before the subscription to the current Single happens

Returns:

the new Single instance

Since:

2.0

delaySubscription

@CheckReturnValue
 @SchedulerSupport(value="io.reactivex:computation")
public final Single<T> delaySubscription(long time,
        TimeUnit unit)

Delays the actual subscription to the current Single until the given time delay elapsed.

Scheduler:

delaySubscription does by default subscribe to the current Single on the computation Scheduler after the delay.

Parameters:

time - the time amount to wait with the subscription

unit - the time unit of the waiting

Returns:

the new Single instance

Since:

2.0

delaySubscription

@CheckReturnValue
 @SchedulerSupport(value="custom")
public final Single<T> delaySubscription(long time,
        TimeUnit unit,
        Scheduler scheduler)

Delays the actual subscription to the current Single until the given time delay elapsed.

Scheduler:

delaySubscription does by default subscribe to the current Single on the Scheduler you provided, after the delay.

Parameters:

time - the time amount to wait with the subscription

unit - the time unit of the waiting

scheduler - the scheduler to wait on and subscribe on to the current Single

Returns:

the new Single instance

Since:

2.0

dematerialize

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Maybe<R> dematerialize(Function<? super T,Notification<R>> selector)

Maps the Notification success value of this Single back into normal onSuccess, onError or onComplete signals as a Maybe source.

The intended use of the selector function is to perform a type-safe identity mapping (see example) on a source that is already of type Notification<T>. The Java language doesn't allow limiting instance methods to a certain generic argument shape, therefore, a function is used to ensure the conversion remains type safe.

Scheduler:

dematerialize does not operate by default on a particular Scheduler.

Example:

 Single.just(Notification.createOnNext(1))
 .dematerialize(notification -> notification)
 .test()
 .assertResult(1);
 

History: 2.2.4 - experimental

Type Parameters:

R - the result type

Parameters:

selector - the function called with the success item and should return a Notification instance.

Returns:

the new Maybe instance

Since:

3.0.0

See Also:

materialize()

doAfterSuccess

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doAfterSuccess(Consumer<? super T> onAfterSuccess)

Calls the specified consumer with the success item after this item has been emitted to the downstream.

Note that the doAfterSuccess action is shared between subscriptions and as such should be thread-safe.

Scheduler:

doAfterSuccess does not operate by default on a particular Scheduler.

History: 2.0.1 - experimental

Parameters:

onAfterSuccess - the Consumer that will be called after emitting an item from upstream to the downstream

Returns:

the new Single instance

Since:

2.1

doAfterTerminate

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doAfterTerminate(Action onAfterTerminate)

Registers an Action to be called after this Single invokes either onSuccess or onError.

Note that the doAfterTerminate action is shared between subscriptions and as such should be thread-safe.

Scheduler:

doAfterTerminate does not operate by default on a particular Scheduler.

History: 2.0.6 - experimental

Parameters:

onAfterTerminate - an Action to be invoked when the source Single finishes

Returns:

a Single that emits the same items as the source Single, then invokes the Action

Since:

2.1

See Also:

ReactiveX operators documentation: Do

doFinally

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doFinally(Action onFinally)

Calls the specified action after this Single signals onSuccess or onError or gets disposed by the downstream.

In case of a race between a terminal event and a dispose call, the provided onFinally action is executed once per subscription.

Note that the onFinally action is shared between subscriptions and as such should be thread-safe.

Scheduler:

doFinally does not operate by default on a particular Scheduler.

History: 2.0.1 - experimental

Parameters:

onFinally - the action called when this Single terminates or gets disposed

Returns:

the new Single instance

Since:

2.1

doOnSubscribe

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doOnSubscribe(Consumer<? super Disposable> onSubscribe)

Calls the shared consumer with the Disposable sent through the onSubscribe for each SingleObserver that subscribes to the current Single.

Scheduler:

doOnSubscribe does not operate by default on a particular Scheduler.

Parameters:

onSubscribe - the consumer called with the Disposable sent via onSubscribe

Returns:

the new Single instance

Since:

2.0

doOnTerminate

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doOnTerminate(Action onTerminate)

Returns a Single instance that calls the given onTerminate callback just before this Single completes normally or with an exception.

This differs from doAfterTerminate in that this happens before the onSuccess or onError notification.

Scheduler:

doOnTerminate does not operate by default on a particular Scheduler.

History: 2.2.7 - experimental

Parameters:

onTerminate - the action to invoke when the consumer calls onSuccess or onError

Returns:

the new Single instance

Since:

3.0.0

See Also:

ReactiveX operators documentation: Do, doOnTerminate(Action)

doOnSuccess

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doOnSuccess(Consumer<? super T> onSuccess)

Calls the shared consumer with the success value sent via onSuccess for each SingleObserver that subscribes to the current Single.

Scheduler:

doOnSuccess does not operate by default on a particular Scheduler.

Parameters:

onSuccess - the consumer called with the success value of onSuccess

Returns:

the new Single instance

Since:

2.0

doOnEvent

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doOnEvent(BiConsumer<? super T,? super Throwable> onEvent)

Calls the shared consumer with the error sent via onError or the value via onSuccess for each SingleObserver that subscribes to the current Single.

Scheduler:

doOnEvent does not operate by default on a particular Scheduler.

Parameters:

onEvent - the consumer called with the success value of onEvent

Returns:

the new Single instance

Since:

2.0

doOnError

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doOnError(Consumer<? super Throwable> onError)

Calls the shared consumer with the error sent via onError for each SingleObserver that subscribes to the current Single.

Scheduler:

doOnError does not operate by default on a particular Scheduler.

Parameters:

onError - the consumer called with the success value of onError

Returns:

the new Single instance

Since:

2.0

doOnDispose

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> doOnDispose(Action onDispose)

Calls the shared Action if a SingleObserver subscribed to the current Single disposes the common Disposable it received via onSubscribe.

Scheduler:

doOnDispose does not operate by default on a particular Scheduler.

Parameters:

onDispose - the action called when the subscription is disposed

Returns:

the new Single instance

Throws:

NullPointerException - if onDispose is null

Since:

2.0

filter

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Maybe<T> filter(Predicate<? super T> predicate)

Filters the success item of the Single via a predicate function and emitting it if the predicate returns true, completing otherwise.

Scheduler:

filter does not operate by default on a particular Scheduler.

Parameters:

predicate - a function that evaluates the item emitted by the source Maybe, returning true if it passes the filter

Returns:

a Maybe that emit the item emitted by the source Maybe that the filter evaluates as true

See Also:

ReactiveX operators documentation: Filter

flatMap

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Single<R> flatMap(Function<? super T,? extends SingleSource<? extends R>> mapper)

Returns a Single that is based on applying a specified function to the item emitted by the source Single, where that function returns a SingleSource.

Scheduler:

flatMap does not operate by default on a particular Scheduler.

Type Parameters:

R - the result value type

Parameters:

mapper - a function that, when applied to the item emitted by the source Single, returns a SingleSource

Returns:

the Single returned from mapper when applied to the item emitted by the source Single

See Also:

ReactiveX operators documentation: FlatMap

flatMapMaybe

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Maybe<R> flatMapMaybe(Function<? super T,? extends MaybeSource<? extends R>> mapper)

Returns a Maybe that is based on applying a specified function to the item emitted by the source Single, where that function returns a MaybeSource.

Scheduler:

flatMapMaybe does not operate by default on a particular Scheduler.

Type Parameters:

R - the result value type

Parameters:

mapper - a function that, when applied to the item emitted by the source Single, returns a MaybeSource

Returns:

the Maybe returned from mapper when applied to the item emitted by the source Single

See Also:

ReactiveX operators documentation: FlatMap

flatMapPublisher

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Flowable<R> flatMapPublisher(Function<? super T,? extends Publisher<? extends R>> mapper)

Returns a Flowable that emits items based on applying a specified function to the item emitted by the source Single, where that function returns a Publisher.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer and the Publisher returned by the mapper function is expected to honor it as well.

Scheduler:

flatMapPublisher does not operate by default on a particular Scheduler.

Type Parameters:

R - the result value type

Parameters:

mapper - a function that, when applied to the item emitted by the source Single, returns a Flowable

Returns:

the Flowable returned from func when applied to the item emitted by the source Single

See Also:

ReactiveX operators documentation: FlatMap

flattenAsFlowable

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <U> Flowable<U> flattenAsFlowable(Function<? super T,? extends Iterable<? extends U>> mapper)

Maps the success value of the upstream Single into an Iterable and emits its items as a Flowable sequence.

Backpressure:

The operator honors backpressure from downstream.

Scheduler:

flattenAsFlowable does not operate by default on a particular Scheduler.

Type Parameters:

U - the type of item emitted by the resulting Iterable

Parameters:

mapper - a function that returns an Iterable sequence of values for when given an item emitted by the source Single

Returns:

the new Flowable instance

See Also:

ReactiveX operators documentation: FlatMap

flattenAsObservable

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <U> Observable<U> flattenAsObservable(Function<? super T,? extends Iterable<? extends U>> mapper)

Maps the success value of the upstream Single into an Iterable and emits its items as an Observable sequence.

Scheduler:

flattenAsObservable does not operate by default on a particular Scheduler.

Type Parameters:

U - the type of item emitted by the resulting Iterable

Parameters:

mapper - a function that returns an Iterable sequence of values for when given an item emitted by the source Single

Returns:

the new Observable instance

See Also:

ReactiveX operators documentation: FlatMap

flatMapObservable

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Observable<R> flatMapObservable(Function<? super T,? extends ObservableSource<? extends R>> mapper)

Returns an Observable that is based on applying a specified function to the item emitted by the source Single, where that function returns an ObservableSource.

Scheduler:

flatMapObservable does not operate by default on a particular Scheduler.

Type Parameters:

R - the result value type

Parameters:

mapper - a function that, when applied to the item emitted by the source Single, returns an ObservableSource

Returns:

the Observable returned from func when applied to the item emitted by the source Single

See Also:

ReactiveX operators documentation: FlatMap

flatMapCompletable

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Completable flatMapCompletable(Function<? super T,? extends CompletableSource> mapper)

Returns a Completable that completes based on applying a specified function to the item emitted by the source Single, where that function returns a Completable.

Scheduler:

flatMapCompletable does not operate by default on a particular Scheduler.

Parameters:

mapper - a function that, when applied to the item emitted by the source Single, returns a Completable

Returns:

the Completable returned from func when applied to the item emitted by the source Single

Since:

2.0

See Also:

ReactiveX operators documentation: FlatMap

blockingGet

@CheckReturnValue
 @SchedulerSupport(value="none")
public final T blockingGet()

Waits in a blocking fashion until the current Single signals a success value (which is returned) or an exception (which is propagated).

Scheduler:

blockingGet does not operate by default on a particular Scheduler.

Error handling:

If the source signals an error, the operator wraps a checked Exception into RuntimeException and throws that. Otherwise, RuntimeExceptions and Errors are rethrown as they are.

Returns:

the success value

lift

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Single<R> lift(SingleOperator<? extends R,? super T> lift)

This method requires advanced knowledge about building operators, please consider other standard composition methods first; Returns a Single which, when subscribed to, invokes the apply(SingleObserver) method of the provided SingleOperator for each individual downstream Single and allows the insertion of a custom operator by accessing the downstream's SingleObserver during this subscription phase and providing a new SingleObserver, containing the custom operator's intended business logic, that will be used in the subscription process going further upstream.

Generally, such a new SingleObserver will wrap the downstream's SingleObserver and forwards the onSuccess and onError events from the upstream directly or according to the emission pattern the custom operator's business logic requires. In addition, such operator can intercept the flow control calls of dispose and isDisposed that would have traveled upstream and perform additional actions depending on the same business logic requirements.

Example:

 // Step 1: Create the consumer type that will be returned by the SingleOperator.apply():

 public final class CustomSingleObserver<T> implements SingleObserver<T>, Disposable {

     // The downstream's SingleObserver that will receive the onXXX events
     final SingleObserver<? super String> downstream;

     // The connection to the upstream source that will call this class' onXXX methods
     Disposable upstream;

     // The constructor takes the downstream subscriber and usually any other parameters
     public CustomSingleObserver(SingleObserver<? super String> downstream) {
         this.downstream = downstream;
     }

     // In the subscription phase, the upstream sends a Disposable to this class
     // and subsequently this class has to send a Disposable to the downstream.
     // Note that relaying the upstream's Disposable directly is not allowed in RxJava
     @Override
     public void onSubscribe(Disposable d) {
         if (upstream != null) {
             d.dispose();
         } else {
             upstream = d;
             downstream.onSubscribe(this);
         }
     }

     // The upstream calls this with the next item and the implementation's
     // responsibility is to emit an item to the downstream based on the intended
     // business logic, or if it can't do so for the particular item,
        // request more from the upstream
     @Override
     public void onSuccess(T item) {
         String str = item.toString();
         if (str.length() < 2) {
             downstream.onSuccess(str);
         } else {
             // Single is usually expected to produce one of the onXXX events
             downstream.onError(new NoSuchElementException());
         }
     }

     // Some operators may handle the upstream's error while others
     // could just forward it to the downstream.
     @Override
     public void onError(Throwable throwable) {
         downstream.onError(throwable);
     }

     // Some operators may use their own resources which should be cleaned up if
     // the downstream disposes the flow before it completed. Operators without
     // resources can simply forward the dispose to the upstream.
     // In some cases, a disposed flag may be set by this method so that other parts
     // of this class may detect the dispose and stop sending events
     // to the downstream.
     @Override
     public void dispose() {
         upstream.dispose();
     }

     // Some operators may simply forward the call to the upstream while others
     // can return the disposed flag set in dispose().
     @Override
     public boolean isDisposed() {
         return upstream.isDisposed();
     }
 }

 // Step 2: Create a class that implements the SingleOperator interface and
 //         returns the custom consumer type from above in its apply() method.
 //         Such class may define additional parameters to be submitted to
 //         the custom consumer type.

 final class CustomSingleOperator<T> implements SingleOperator<String> {
     @Override
     public SingleObserver<? super String> apply(SingleObserver<? super T> upstream) {
         return new CustomSingleObserver<T>(upstream);
     }
 }

 // Step 3: Apply the custom operator via lift() in a flow by creating an instance of it
 //         or reusing an existing one.

 Single.just(5)
 .lift(new CustomSingleOperator<Integer>())
 .test()
 .assertResult("5");

 Single.just(15)
 .lift(new CustomSingleOperator<Integer>())
 .test()
 .assertFailure(NoSuchElementException.class);
 

Creating custom operators can be complicated and it is recommended one consults the RxJava wiki: Writing operators page about the tools, requirements, rules, considerations and pitfalls of implementing them.

Note that implementing custom operators via this lift() method adds slightly more overhead by requiring an additional allocation and indirection per assembled flows. Instead, extending the abstract Single class and creating a SingleTransformer with it is recommended.

Note also that it is not possible to stop the subscription phase in lift() as the apply() method requires a non-null SingleObserver instance to be returned, which is then unconditionally subscribed to the upstream Single. For example, if the operator decided there is no reason to subscribe to the upstream source because of some optimization possibility or a failure to prepare the operator, it still has to return a SingleObserver that should immediately dispose the upstream's Disposable in its onSubscribe method. Again, using a SingleTransformer and extending the Single is a better option as subscribeActual(io.reactivex.rxjava3.core.SingleObserver<? super T>) can decide to not subscribe to its upstream after all.

Scheduler:

lift does not operate by default on a particular Scheduler, however, the SingleOperator may use a Scheduler to support its own asynchronous behavior.

Type Parameters:

R - the output value type

Parameters:

lift - the SingleOperator that receives the downstream's SingleObserver and should return a SingleObserver with custom behavior to be used as the consumer for the current Single.

Returns:

the new Single instance

See Also:

RxJava wiki: Writing operators, compose(SingleTransformer)

map

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <R> Single<R> map(Function<? super T,? extends R> mapper)

Returns a Single that applies a specified function to the item emitted by the source Single and emits the result of this function application.

Scheduler:

map does not operate by default on a particular Scheduler.

Type Parameters:

R - the result value type

Parameters:

mapper - a function to apply to the item emitted by the Single

Returns:

a Single that emits the item from the source Single, transformed by the specified function

See Also:

ReactiveX operators documentation: Map

materialize

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<Notification<T>> materialize()

Maps the signal types of this Single into a Notification of the same kind and emits it as a single success value to downstream.

Scheduler:

materialize does not operate by default on a particular Scheduler.

History: 2.2.4 - experimental

Returns:

the new Single instance

Since:

3.0.0

See Also:

dematerialize(Function)

contains

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<Boolean> contains(Object value)

Signals true if the current Single signals a success value that is Object-equals with the value provided.

Scheduler:

contains does not operate by default on a particular Scheduler.

Parameters:

value - the value to compare against the success value of this Single

Returns:

the new Single instance

Since:

2.0

contains

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<Boolean> contains(Object value,
        BiPredicate<Object,Object> comparer)

Signals true if the current Single signals a success value that is equal with the value provided by calling a bi-predicate.

Scheduler:

contains does not operate by default on a particular Scheduler.

Parameters:

value - the value to compare against the success value of this Single

comparer - the function that receives the success value of this Single, the value provided and should return true if they are considered equal

Returns:

the new Single instance

Since:

2.0

mergeWith

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> mergeWith(SingleSource<? extends T> other)

Flattens this and another Single into a single Flowable, without any transformation.

You can combine items emitted by multiple Singles so that they appear as a single Flowable, by using the mergeWith method.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

mergeWith does not operate by default on a particular Scheduler.

Parameters:

other - a SingleSource to be merged

Returns:

that emits all of the items emitted by the source Singles

See Also:

ReactiveX operators documentation: Merge

observeOn

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="custom")
public final Single<T> observeOn(Scheduler scheduler)

Modifies a Single to emit its item (or notify of its error) on a specified Scheduler, asynchronously.

Scheduler:

you specify which Scheduler this operator will use.

Parameters:

scheduler - the Scheduler to notify subscribers on

Returns:

the source Single modified so that its subscribers are notified on the specified Scheduler

Throws:

NullPointerException - if scheduler is null

See Also:

ReactiveX operators documentation: ObserveOn, RxJava Threading Examples, subscribeOn(io.reactivex.rxjava3.core.Scheduler)

onErrorReturn

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> onErrorReturn(Function<Throwable,? extends T> resumeFunction)

Instructs a Single to emit an item (returned by a specified function) rather than invoking onError if it encounters an error.

By default, when a Single encounters an error that prevents it from emitting the expected item to its subscriber, the Single invokes its subscriber's SingleObserver.onError(java.lang.Throwable) method, and then quits without invoking any more of its subscriber's methods. The onErrorReturn method changes this behavior. If you pass a function (resumeFunction) to a Single's onErrorReturn method, if the original Single encounters an error, instead of invoking its subscriber's SingleObserver.onError(java.lang.Throwable) method, it will instead emit the return value of resumeFunction.

You can use this to prevent errors from propagating or to supply fallback data should errors be encountered.

Scheduler:

onErrorReturn does not operate by default on a particular Scheduler.

Parameters:

resumeFunction - a function that returns an item that the new Single will emit if the source Single encounters an error

Returns:

the original Single with appropriately modified behavior

See Also:

ReactiveX operators documentation: Catch

onErrorReturnItem

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> onErrorReturnItem(T value)

Signals the specified value as success in case the current Single signals an error.

Scheduler:

onErrorReturnItem does not operate by default on a particular Scheduler.

Parameters:

value - the value to signal if the current Single fails

Returns:

the new Single instance

Since:

2.0

onErrorResumeWith

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> onErrorResumeWith(SingleSource<? extends T> resumeSingleInCaseOfError)

Instructs a Single to pass control to another Single rather than invoking SingleObserver.onError(Throwable) if it encounters an error.

By default, when a Single encounters an error that prevents it from emitting the expected item to its SingleObserver, the Single invokes its SingleObserver's onError method, and then quits without invoking any more of its SingleObserver's methods. The onErrorResumeWith method changes this behavior. If you pass another Single (resumeSingleInCaseOfError) to a Single's onErrorResumeWith method, if the original Single encounters an error, instead of invoking its SingleObserver's onError method, it will instead relinquish control to resumeSingleInCaseOfError which will invoke the SingleObserver's onSuccess method if it is able to do so. In such a case, because no Single necessarily invokes onError, the SingleObserver may never know that an error happened.

You can use this to prevent errors from propagating or to supply fallback data should errors be encountered.

Scheduler:

onErrorResumeWith does not operate by default on a particular Scheduler.

Parameters:

resumeSingleInCaseOfError - a Single that will take control if source Single encounters an error.

Returns:

the original Single, with appropriately modified behavior.

See Also:

ReactiveX operators documentation: Catch

onErrorResumeNext

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> onErrorResumeNext(Function<? super Throwable,? extends SingleSource<? extends T>> resumeFunctionInCaseOfError)

Instructs a Single to pass control to another Single rather than invoking SingleObserver.onError(Throwable) if it encounters an error.

By default, when a Single encounters an error that prevents it from emitting the expected item to its SingleObserver, the Single invokes its SingleObserver's onError method, and then quits without invoking any more of its SingleObserver's methods. The onErrorResumeNext method changes this behavior. If you pass a function that will return another Single (resumeFunctionInCaseOfError) to a Single's onErrorResumeNext method, if the original Single encounters an error, instead of invoking its SingleObserver's onError method, it will instead relinquish control to resumeSingleInCaseOfError which will invoke the SingleObserver's onSuccess method if it is able to do so. In such a case, because no Single necessarily invokes onError, the SingleObserver may never know that an error happened.

You can use this to prevent errors from propagating or to supply fallback data should errors be encountered.

Scheduler:

onErrorResumeNext does not operate by default on a particular Scheduler.

Parameters:

resumeFunctionInCaseOfError - a function that returns a Single that will take control if source Single encounters an error.

Returns:

the original Single, with appropriately modified behavior.

Since:

.20

See Also:

ReactiveX operators documentation: Catch

onTerminateDetach

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> onTerminateDetach()

Nulls out references to the upstream producer and downstream SingleObserver if the sequence is terminated or downstream calls dispose().

Scheduler:

onTerminateDetach does not operate by default on a particular Scheduler.

History: 2.1.5 - experimental

Returns:

a Single which nulls out references to the upstream producer and downstream SingleObserver if the sequence is terminated or downstream calls dispose()

Since:

2.2

repeat

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> repeat()

Repeatedly re-subscribes to the current Single and emits each success value.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

repeat does not operate by default on a particular Scheduler.

Returns:

the new Flowable instance

Since:

2.0

repeat

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> repeat(long times)

Re-subscribes to the current Single at most the given number of times and emits each success value.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

repeat does not operate by default on a particular Scheduler.

Parameters:

times - the number of times to re-subscribe to the current Single

Returns:

the new Flowable instance

Since:

2.0

repeatWhen

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> repeatWhen(Function<? super Flowable<Object>,? extends Publisher<?>> handler)

Re-subscribes to the current Single if the Publisher returned by the handler function signals a value in response to a value signalled through the Flowable the handle receives.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer. The Publisher returned by the handler function is expected to honor backpressure as well.

Scheduler:

repeatWhen does not operate by default on a particular Scheduler.

Parameters:

handler - the function that is called with a Flowable that signals a value when the Single signalled a success value and returns a Publisher that has to signal a value to trigger a resubscription to the current Single, otherwise the terminal signal of the Publisher will be the terminal signal of the sequence as well.

Returns:

the new Flowable instance

Since:

2.0

repeatUntil

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> repeatUntil(BooleanSupplier stop)

Re-subscribes to the current Single until the given BooleanSupplier returns true.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

repeatUntil does not operate by default on a particular Scheduler.

Parameters:

stop - the BooleanSupplier called after the current Single succeeds and if returns false, the Single is re-subscribed; otherwise the sequence completes.

Returns:

the new Flowable instance

Since:

2.0

retry

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> retry()

Repeatedly re-subscribes to the current Single indefinitely if it fails with an onError.

Scheduler:

retry does not operate by default on a particular Scheduler.

Returns:

the new Single instance

Since:

2.0

retry

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> retry(long times)

Repeatedly re-subscribe at most the specified times to the current Single if it fails with an onError.

Scheduler:

retry does not operate by default on a particular Scheduler.

Parameters:

times - the number of times to resubscribe if the current Single fails

Returns:

the new Single instance

Since:

2.0

retry

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> retry(BiPredicate<? super Integer,? super Throwable> predicate)

Re-subscribe to the current Single if the given predicate returns true when the Single fails with an onError.

Scheduler:

retry does not operate by default on a particular Scheduler.

Parameters:

predicate - the predicate called with the resubscription count and the failure Throwable and should return true if a resubscription should happen

Returns:

the new Single instance

Since:

2.0

retry

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> retry(long times,
        Predicate<? super Throwable> predicate)

Repeatedly re-subscribe at most times or until the predicate returns false, whichever happens first if it fails with an onError.

Scheduler:

retry does not operate by default on a particular Scheduler.

History: 2.1.8 - experimental

Parameters:

times - the number of times to resubscribe if the current Single fails

predicate - the predicate called with the failure Throwable and should return true if a resubscription should happen

Returns:

the new Single instance

Since:

2.2

retry

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> retry(Predicate<? super Throwable> predicate)

Re-subscribe to the current Single if the given predicate returns true when the Single fails with an onError.

Scheduler:

retry does not operate by default on a particular Scheduler.

Parameters:

predicate - the predicate called with the failure Throwable and should return true if a resubscription should happen

Returns:

the new Single instance

Since:

2.0

retryWhen

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Single<T> retryWhen(Function<? super Flowable<Throwable>,? extends Publisher<?>> handler)

Re-subscribes to the current Single if and when the Publisher returned by the handler function signals a value.

If the Publisher signals an onComplete, the resulting Single will signal a NoSuchElementException.

Note that the inner Publisher returned by the handler function should signal either onNext, onError or onComplete in response to the received Throwable to indicate the operator should retry or terminate. If the upstream to the operator is asynchronous, signaling onNext followed by onComplete immediately may result in the sequence to be completed immediately. Similarly, if this inner Publisher signals onError or onComplete while the upstream is active, the sequence is terminated with the same signal immediately.

The following example demonstrates how to retry an asynchronous source with a delay:

 Single.timer(1, TimeUnit.SECONDS)
     .doOnSubscribe(s -> System.out.println("subscribing"))
     .map(v -> { throw new RuntimeException(); })
     .retryWhen(errors -> {
         AtomicInteger counter = new AtomicInteger();
         return errors
                   .takeWhile(e -> counter.getAndIncrement() != 3)
                   .flatMap(e -> {
                       System.out.println("delay retry by " + counter.get() + " second(s)");
                       return Flowable.timer(counter.get(), TimeUnit.SECONDS);
                   });
     })
     .blockingGet();
 

Scheduler:

retryWhen does not operate by default on a particular Scheduler.

Parameters:

handler - the function that receives a Flowable of the error the Single emits and should return a Publisher that should signal a normal value (in response to the throwable the Flowable emits) to trigger a resubscription or signal an error to be the output of the resulting Single

Returns:

the new Single instance

subscribe

@SchedulerSupport(value="none")
public final Disposable subscribe()

Subscribes to a Single but ignore its emission or notification.

If the Single emits an error, it is wrapped into an OnErrorNotImplementedException and routed to the RxJavaPlugins.onError handler.

Scheduler:

subscribe does not operate by default on a particular Scheduler.

Returns:

a Disposable reference can request the Single stop work.

See Also:

ReactiveX operators documentation: Subscribe

subscribe

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Disposable subscribe(BiConsumer<? super T,? super Throwable> onCallback)

Subscribes to a Single and provides a composite callback to handle the item it emits or any error notification it issues.

Scheduler:

subscribe does not operate by default on a particular Scheduler.

Parameters:

onCallback - the callback that receives either the success value or the failure Throwable (whichever is not null)

Returns:

a Disposable reference can request the Single stop work.

Throws:

NullPointerException - if onCallback is null

See Also:

ReactiveX operators documentation: Subscribe

subscribe

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Disposable subscribe(Consumer<? super T> onSuccess)

Subscribes to a Single and provides a callback to handle the item it emits.

If the Single emits an error, it is wrapped into an OnErrorNotImplementedException and routed to the RxJavaPlugins.onError handler.

Scheduler:

subscribe does not operate by default on a particular Scheduler.

Parameters:

onSuccess - the Consumer<T> you have designed to accept the emission from the Single

Returns:

a Disposable reference can request the Single stop work.

Throws:

NullPointerException - if onSuccess is null

See Also:

ReactiveX operators documentation: Subscribe

subscribe

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Disposable subscribe(Consumer<? super T> onSuccess,
        Consumer<? super Throwable> onError)

Subscribes to a Single and provides callbacks to handle the item it emits or any error notification it issues.

Scheduler:

subscribe does not operate by default on a particular Scheduler.

Parameters:

onSuccess - the Consumer<T> you have designed to accept the emission from the Single

onError - the Consumer<Throwable> you have designed to accept any error notification from the Single

Returns:

a Disposable reference can request the Single stop work.

Throws:

NullPointerException - if onSuccess is null, or if onError is null

See Also:

ReactiveX operators documentation: Subscribe

subscribe

@SchedulerSupport(value="none")
public final void subscribe(SingleObserver<? super T> observer)

Description copied from interface: SingleSource

Subscribes the given SingleObserver to this SingleSource instance.

Specified by:

subscribe in interface SingleSource<T>

Parameters:

observer - the SingleObserver, not null

subscribeActual

protected abstract void subscribeActual(@NonNull SingleObserver<? super T> observer)

Implement this method in subclasses to handle the incoming SingleObservers.

There is no need to call any of the plugin hooks on the current Single instance or the SingleObserver; all hooks and basic safeguards have been applied by subscribe(SingleObserver) before this method gets called.

Parameters:

observer - the SingleObserver to handle, not null

subscribeWith

@CheckReturnValue
 @SchedulerSupport(value="none")
public final <E extends SingleObserver<? super T>> E subscribeWith(E observer)

Subscribes a given SingleObserver (subclass) to this Single and returns the given SingleObserver as is.

Usage example:

 Single<Integer> source = Single.just(1);
 CompositeDisposable composite = new CompositeDisposable();

 DisposableSingleObserver<Integer> ds = new DisposableSingleObserver<>() {
     // ...
 };

 composite.add(source.subscribeWith(ds));
 

Scheduler:

subscribeWith does not operate by default on a particular Scheduler.

Type Parameters:

E - the type of the SingleObserver to use and return

Parameters:

observer - the SingleObserver (subclass) to use and return, not null

Returns:

the input observer

Throws:

NullPointerException - if observer is null

Since:

2.0

subscribeOn

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="custom")
public final Single<T> subscribeOn(Scheduler scheduler)

Asynchronously subscribes subscribers to this Single on the specified Scheduler.

Scheduler:

You specify which Scheduler this operator will use.

Parameters:

scheduler - the Scheduler to perform subscription actions on

Returns:

the source Single modified so that its subscriptions happen on the specified Scheduler

See Also:

ReactiveX operators documentation: SubscribeOn, RxJava Threading Examples, observeOn(io.reactivex.rxjava3.core.Scheduler)

takeUntil

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final Single<T> takeUntil(CompletableSource other)

Returns a Single that emits the item emitted by the source Single until a Completable terminates. Upon termination of other, this will emit a CancellationException rather than go to SingleObserver.onSuccess(Object).

Scheduler:

takeUntil does not operate by default on a particular Scheduler.

Parameters:

other - the Completable whose termination will cause takeUntil to emit the item from the source Single

Returns:

a Single that emits the item emitted by the source Single until such time as other terminates.

See Also:

ReactiveX operators documentation: TakeUntil

takeUntil

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <E> Single<T> takeUntil(Publisher<E> other)

Returns a Single that emits the item emitted by the source Single until a Publisher emits an item. Upon emission of an item from other, this will emit a CancellationException rather than go to SingleObserver.onSuccess(Object).

Backpressure:

The other publisher is consumed in an unbounded fashion but will be cancelled after the first item it produced.

Scheduler:

takeUntil does not operate by default on a particular Scheduler.

Type Parameters:

E - the type of items emitted by other

Parameters:

other - the Publisher whose first emitted item will cause takeUntil to emit the item from the source Single

Returns:

a Single that emits the item emitted by the source Single until such time as other emits its first item

See Also:

ReactiveX operators documentation: TakeUntil

takeUntil

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="none")
public final <E> Single<T> takeUntil(SingleSource<? extends E> other)

Returns a Single that emits the item emitted by the source Single until a second Single emits an item. Upon emission of an item from other, this will emit a CancellationException rather than go to SingleObserver.onSuccess(Object).

Scheduler:

takeUntil does not operate by default on a particular Scheduler.

Type Parameters:

E - the type of item emitted by other

Parameters:

other - the Single whose emitted item will cause takeUntil to emit the item from the source Single

Returns:

a Single that emits the item emitted by the source Single until such time as other emits its item

See Also:

ReactiveX operators documentation: TakeUntil

timeout

@CheckReturnValue
 @SchedulerSupport(value="io.reactivex:computation")
public final Single<T> timeout(long timeout,
        TimeUnit unit)

Signals a TimeoutException if the current Single doesn't signal a success value within the specified timeout window.

Scheduler:

timeout signals the TimeoutException on the computation Scheduler.

Parameters:

timeout - the timeout amount

unit - the time unit

Returns:

the new Single instance

Since:

2.0

timeout

@CheckReturnValue
 @SchedulerSupport(value="custom")
public final Single<T> timeout(long timeout,
        TimeUnit unit,
        Scheduler scheduler)

Signals a TimeoutException if the current Single doesn't signal a success value within the specified timeout window.

Scheduler:

timeout signals the TimeoutException on the Scheduler you specify.

Parameters:

timeout - the timeout amount

unit - the time unit

scheduler - the target scheduler where the timeout is awaited and the TimeoutException signalled

Returns:

the new Single instance

Since:

2.0

timeout

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="custom")
public final Single<T> timeout(long timeout,
        TimeUnit unit,
        Scheduler scheduler,
        SingleSource<? extends T> other)

Runs the current Single and if it doesn't signal within the specified timeout window, it is disposed and the other SingleSource subscribed to.

Scheduler:

timeout subscribes to the other SingleSource on the Scheduler you specify.

Parameters:

timeout - the timeout amount

unit - the time unit

scheduler - the scheduler where the timeout is awaited and the subscription to other happens

other - the other SingleSource that gets subscribed to if the current Single times out

Returns:

the new Single instance

Since:

2.0

timeout

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="io.reactivex:computation")
public final Single<T> timeout(long timeout,
        TimeUnit unit,
        SingleSource<? extends T> other)

Runs the current Single and if it doesn't signal within the specified timeout window, it is disposed and the other SingleSource subscribed to.

Scheduler:

timeout subscribes to the other SingleSource on the computation Scheduler.

Parameters:

timeout - the timeout amount

unit - the time unit

other - the other SingleSource that gets subscribed to if the current Single times out

Returns:

the new Single instance

Throws:

NullPointerException - if other is null, or if unit is null, or if scheduler is null

Since:

2.0

to

@CheckReturnValue
 @SchedulerSupport(value="none")
public final <R> R to(@NonNull SingleConverter<T,? extends R> converter)

Calls the specified converter function during assembly time and returns its resulting value.

This allows fluent conversion to any other type.

Scheduler:

to does not operate by default on a particular Scheduler.

History: 2.1.7 - experimental

Type Parameters:

R - the resulting object type

Parameters:

converter - the function that receives the current Single instance and returns a value

Returns:

the converted value

Throws:

NullPointerException - if converter is null

Since:

2.2

ignoreElement

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Completable ignoreElement()

Returns a Completable that ignores the success value of this Single and signals onComplete instead.

Scheduler:

ignoreElement does not operate by default on a particular Scheduler.

Returns:

a Completable that signals onComplete on it's observer when the source Single calls onSuccess.

Since:

2.1.13

toFlowable

@BackpressureSupport(value=FULL)
 @CheckReturnValue
 @SchedulerSupport(value="none")
public final Flowable<T> toFlowable()

Converts this Single into a Flowable.

Backpressure:

The returned Flowable honors the backpressure of the downstream consumer.

Scheduler:

toFlowable does not operate by default on a particular Scheduler.

Returns:

a Flowable that emits a single item T or an error.

toFuture

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Future<T> toFuture()

Returns a Future representing the single value emitted by this Single.

Scheduler:

toFuture does not operate by default on a particular Scheduler.

Returns:

a Future that expects a single item to be emitted by this Single

See Also:

ReactiveX documentation: To

toMaybe

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Maybe<T> toMaybe()

Converts this Single into a Maybe.

Scheduler:

toMaybe does not operate by default on a particular Scheduler.

Returns:

a Maybe that emits a single item T or an error.

toObservable

@CheckReturnValue
 @SchedulerSupport(value="none")
public final Observable<T> toObservable()

Converts this Single into an Observable.

Scheduler:

toObservable does not operate by default on a particular Scheduler.

Returns:

an Observable that emits a single item T or an error.

unsubscribeOn

@CheckReturnValue
 @NonNull
 @SchedulerSupport(value="custom")
public final Single<T> unsubscribeOn(Scheduler scheduler)

Returns a Single which makes sure when a SingleObserver disposes the Disposable, that call is propagated up on the specified scheduler.

Scheduler:

unsubscribeOn calls dispose() of the upstream on the Scheduler you specify.

History: 2.0.9 - experimental

Parameters:

scheduler - the target scheduler where to execute the disposal

Returns:

the new Single instance

Throws:

NullPointerException - if scheduler is null

Since:

2.2

zipWith

@CheckReturnValue
 @SchedulerSupport(value="none")
public final <U,R> Single<R> zipWith(SingleSource<U> other,
        BiFunction<? super T,? super U,? extends R> zipper)

Returns a Single that emits the result of applying a specified function to the pair of items emitted by the source Single and another specified Single.

Scheduler:

zipWith does not operate by default on a particular Scheduler.

Type Parameters:

U - the type of items emitted by the other Single

R - the type of items emitted by the resulting Single

Parameters:

other - the other SingleSource

zipper - a function that combines the pairs of items from the two SingleSources to generate the items to be emitted by the resulting Single

Returns:

a Single that pairs up values from the source Single and the other SingleSource and emits the results of zipFunction applied to these pairs

See Also:

ReactiveX operators documentation: Zip

test

@CheckReturnValue
 @SchedulerSupport(value="none")
public final TestObserver<T> test()

Creates a TestObserver and subscribes it to this Single.

Scheduler:

test does not operate by default on a particular Scheduler.

Returns:

the new TestObserver instance

Since:

2.0

test

@CheckReturnValue
 @SchedulerSupport(value="none")
public final TestObserver<T> test(boolean dispose)

Creates a TestObserver optionally in cancelled state, then subscribes it to this Single.

Scheduler:

test does not operate by default on a particular Scheduler.

Parameters:

dispose - if true, the TestObserver will be cancelled before subscribing to this Single.

Returns:

the new TestObserver instance

Since:

2.0