io.reactivex.subjects

Class UnicastSubject<T>

java.lang.Object

io.reactivex.Observable<T>

io.reactivex.subjects.Subject<T>

io.reactivex.subjects.UnicastSubject<T>

Type Parameters:

T - the value type received and emitted by this Subject subclass

All Implemented Interfaces:

ObservableSource<T>, Observer<T>

public final class UnicastSubject<T>
extends Subject<T>

Subject that allows only a single Subscriber to subscribe to it during its lifetime.

This subject buffers notifications and replays them to the Subscriber as requested.

This subject holds an unbounded internal buffer.

If more than one Subscriber attempts to subscribe to this Subject, they will receive an IllegalStateException if this Subject hasn't terminated yet, or the Subscribers receive the terminal event (error or completion) if this Subject has terminated.

Since:

2.0

Method Summary

Methods

Modifier and Type	Method and Description
static <T> UnicastSubject<T>	create() Creates an UnicastSubject with an internal buffer capacity hint 16.
static <T> UnicastSubject<T>	create(boolean delayError) Creates an UnicastSubject with an internal buffer capacity hint 16 and given delay error flag.
static <T> UnicastSubject<T>	create(int capacityHint) Creates an UnicastSubject with the given internal buffer capacity hint.
static <T> UnicastSubject<T>	create(int capacityHint, java.lang.Runnable onTerminate) Creates an UnicastSubject with the given internal buffer capacity hint and a callback for the case when the single Subscriber cancels its subscription.
static <T> UnicastSubject<T>	create(int capacityHint, java.lang.Runnable onTerminate, boolean delayError) Creates an UnicastSubject with the given internal buffer capacity hint, delay error flag and a callback for the case when the single Subscriber cancels its subscription.
java.lang.Throwable	getThrowable() Returns the error that caused the Subject to terminate or null if the Subject hasn't terminated yet.
boolean	hasComplete() Returns true if the subject has reached a terminal state through a complete event.
boolean	hasObservers() Returns true if the subject has any Observers.
boolean	hasThrowable() Returns true if the subject has reached a terminal state through an error event.
void	onComplete() Notifies the Observer that the Observable has finished sending push-based notifications.
void	onError(java.lang.Throwable t) Notifies the Observer that the Observable has experienced an error condition.
void	onNext(T t) Provides the Observer with a new item to observe.
void	onSubscribe(Disposable s) Provides the Observer with the means of cancelling (disposing) the connection (channel) with the Observable in both synchronous (from within Observer.onNext(Object)) and asynchronous manner.
protected void	subscribeActual(Observer<? super T> observer) Operator implementations (both source and intermediate) should implement this method that performs the necessary business logic.

Methods inherited from class io.reactivex.subjects.Subject

toSerialized

Methods inherited from class io.reactivex.Observable

all, amb, ambArray, ambWith, any, blockingFirst, blockingFirst, blockingForEach, blockingIterable, blockingIterable, blockingLast, blockingLast, blockingLatest, blockingMostRecent, blockingNext, blockingSingle, blockingSingle, blockingSubscribe, blockingSubscribe, blockingSubscribe, blockingSubscribe, blockingSubscribe, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, bufferSize, cache, cacheWithInitialCapacity, cast, collect, collectInto, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatestDelayError, combineLatestDelayError, combineLatestDelayError, combineLatestDelayError, combineLatestDelayError, compose, concat, concat, concat, concat, concat, concat, concatArray, concatArrayDelayError, concatArrayEager, concatArrayEager, concatDelayError, concatDelayError, concatDelayError, concatEager, concatEager, concatEager, concatEager, concatMap, concatMap, concatMapDelayError, concatMapDelayError, concatMapEager, concatMapEager, concatMapEagerDelayError, concatMapEagerDelayError, concatMapIterable, concatMapIterable, concatWith, contains, count, create, debounce, debounce, debounce, defaultIfEmpty, defer, delay, delay, delay, delay, delay, delay, delaySubscription, delaySubscription, delaySubscription, dematerialize, distinct, distinct, distinct, distinctUntilChanged, distinctUntilChanged, distinctUntilChanged, doAfterNext, doAfterTerminate, doFinally, doOnComplete, doOnDispose, doOnEach, doOnEach, doOnError, doOnLifecycle, doOnNext, doOnSubscribe, doOnTerminate, elementAt, elementAt, elementAtOrError, empty, error, error, filter, first, firstElement, firstOrError, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMapCompletable, flatMapCompletable, flatMapIterable, flatMapIterable, flatMapMaybe, flatMapMaybe, flatMapSingle, flatMapSingle, forEach, forEachWhile, forEachWhile, forEachWhile, fromArray, fromCallable, fromFuture, fromFuture, fromFuture, fromFuture, fromIterable, fromPublisher, generate, generate, generate, generate, generate, groupBy, groupBy, groupBy, groupBy, groupBy, groupJoin, hide, ignoreElements, interval, interval, interval, interval, intervalRange, intervalRange, isEmpty, join, just, just, just, just, just, just, just, just, just, just, last, lastElement, lastOrError, lift, map, materialize, merge, merge, merge, merge, merge, merge, merge, merge, mergeArray, mergeArray, mergeArrayDelayError, mergeArrayDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeWith, never, observeOn, observeOn, observeOn, ofType, onErrorResumeNext, onErrorResumeNext, onErrorReturn, onErrorReturnItem, onExceptionResumeNext, onTerminateDetach, publish, publish, range, rangeLong, reduce, reduce, reduceWith, repeat, repeat, repeatUntil, repeatWhen, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, retry, retry, retry, retry, retry, retryUntil, retryWhen, safeSubscribe, sample, sample, sample, sample, sample, sample, scan, scan, scanWith, sequenceEqual, sequenceEqual, sequenceEqual, sequenceEqual, serialize, share, single, singleElement, singleOrError, skip, skip, skip, skipLast, skipLast, skipLast, skipLast, skipLast, skipLast, skipUntil, skipWhile, sorted, sorted, startWith, startWith, startWith, startWithArray, subscribe, subscribe, subscribe, subscribe, subscribe, subscribe, subscribeOn, subscribeWith, switchIfEmpty, switchMap, switchMap, switchMapDelayError, switchMapDelayError, switchMapSingle, switchMapSingleDelayError, switchOnNext, switchOnNext, switchOnNextDelayError, switchOnNextDelayError, take, take, take, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeUntil, takeUntil, takeWhile, test, test, throttleFirst, throttleFirst, throttleLast, throttleLast, throttleWithTimeout, throttleWithTimeout, timeInterval, timeInterval, timeInterval, timeInterval, timeout, timeout, timeout, timeout, timeout, timeout, timeout, timeout, timer, timer, timestamp, timestamp, timestamp, timestamp, to, toFlowable, toFuture, toList, toList, toList, toMap, toMap, toMap, toMultimap, toMultimap, toMultimap, toMultimap, toSortedList, toSortedList, toSortedList, toSortedList, unsafeCreate, unsubscribeOn, using, using, window, window, window, window, window, window, window, window, window, window, window, window, window, window, window, window, window, window, window, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, wrap, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zipArray, zipIterable, zipWith, zipWith, zipWith, zipWith

Methods inherited from class java.lang.Object

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

Method Detail

create

@CheckReturnValue
public static <T> UnicastSubject<T> create()

Creates an UnicastSubject with an internal buffer capacity hint 16.

Type Parameters:

T - the value type

Returns:

an UnicastSubject instance

create

@CheckReturnValue
public static <T> UnicastSubject<T> create(int capacityHint)

Creates an UnicastSubject with the given internal buffer capacity hint.

Type Parameters:

T - the value type

Parameters:

capacityHint - the hint to size the internal unbounded buffer

Returns:

an UnicastSubject instance

create

@CheckReturnValue
public static <T> UnicastSubject<T> create(int capacityHint,
                                            java.lang.Runnable onTerminate)

Creates an UnicastSubject with the given internal buffer capacity hint and a callback for the case when the single Subscriber cancels its subscription.

The callback, if not null, is called exactly once and non-overlapped with any active replay.

Type Parameters:

T - the value type

Parameters:

capacityHint - the hint to size the internal unbounded buffer

onTerminate - the callback to run when the Subject is terminated or cancelled, null not allowed

Returns:

an UnicastSubject instance

create

@CheckReturnValue
public static <T> UnicastSubject<T> create(int capacityHint,
                                            java.lang.Runnable onTerminate,
                                            boolean delayError)

Creates an UnicastSubject with the given internal buffer capacity hint, delay error flag and a callback for the case when the single Subscriber cancels its subscription.

The callback, if not null, is called exactly once and non-overlapped with any active replay.

Type Parameters:

T - the value type

Parameters:

capacityHint - the hint to size the internal unbounded buffer

onTerminate - the callback to run when the Subject is terminated or cancelled, null not allowed

delayError - deliver pending onNext events before onError

Returns:

an UnicastSubject instance

Since:

2.0.8 - experimental

create

@CheckReturnValue
public static <T> UnicastSubject<T> create(boolean delayError)

Creates an UnicastSubject with an internal buffer capacity hint 16 and given delay error flag.

The callback, if not null, is called exactly once and non-overlapped with any active replay.

Type Parameters:

T - the value type

Parameters:

delayError - deliver pending onNext events before onError

Returns:

an UnicastSubject instance

Since:

2.0.8 - experimental

subscribeActual

protected void subscribeActual(Observer<? super T> observer)

Description copied from class: Observable

Operator implementations (both source and intermediate) should implement this method that performs the necessary business logic.

There is no need to call any of the plugin hooks on the current Observable instance or the Subscriber.

Specified by:

subscribeActual in class Observable<T>

Parameters:

observer - the incoming Observer, never null

onSubscribe

public void onSubscribe(Disposable s)

Description copied from interface: Observer

Provides the Observer with the means of cancelling (disposing) the connection (channel) with the Observable in both synchronous (from within Observer.onNext(Object)) and asynchronous manner.

Parameters:

s - the Disposable instance whose Disposable.dispose() can be called anytime to cancel the connection

onNext

public void onNext(T t)

Description copied from interface: Observer

Provides the Observer with a new item to observe.

The Observable may call this method 0 or more times.

The Observable will not call this method again after it calls either Observer.onComplete() or Observer.onError(java.lang.Throwable).

Parameters:

t - the item emitted by the Observable

onError

public void onError(java.lang.Throwable t)

Description copied from interface: Observer

Notifies the Observer that the Observable has experienced an error condition.

If the Observable calls this method, it will not thereafter call Observer.onNext(T) or Observer.onComplete().

Parameters:

t - the exception encountered by the Observable

onComplete

public void onComplete()

Description copied from interface: Observer

Notifies the Observer that the Observable has finished sending push-based notifications.

The Observable will not call this method if it calls Observer.onError(java.lang.Throwable).

hasObservers

public boolean hasObservers()

Description copied from class: Subject

Returns true if the subject has any Observers.

The method is thread-safe.

Specified by:

hasObservers in class Subject<T>

Returns:

true if the subject has any Observers

getThrowable

public java.lang.Throwable getThrowable()

Description copied from class: Subject

Returns the error that caused the Subject to terminate or null if the Subject hasn't terminated yet.

The method is thread-safe.

Specified by:

getThrowable in class Subject<T>

Returns:

the error that caused the Subject to terminate or null if the Subject hasn't terminated yet

hasThrowable

public boolean hasThrowable()

Description copied from class: Subject

Returns true if the subject has reached a terminal state through an error event.

The method is thread-safe.

Specified by:

hasThrowable in class Subject<T>

Returns:

true if the subject has reached a terminal state through an error event

See Also:

&see {@link #hasComplete()}

hasComplete

public boolean hasComplete()

Description copied from class: Subject

Returns true if the subject has reached a terminal state through a complete event.

The method is thread-safe.

Specified by:

hasComplete in class Subject<T>

Returns:

true if the subject has reached a terminal state through a complete event

See Also:

Subject.hasThrowable()