io.reactivex.processors

Class PublishProcessor<T>

java.lang.Object

io.reactivex.Flowable<T>

io.reactivex.processors.FlowableProcessor<T>

io.reactivex.processors.PublishProcessor<T>

Type Parameters:

T - the value type multicast to Subscribers.

All Implemented Interfaces:

FlowableSubscriber<T>, org.reactivestreams.Processor<T,T>, org.reactivestreams.Publisher<T>, org.reactivestreams.Subscriber<T>

public final class PublishProcessor<T>
extends FlowableProcessor<T>

A Subject that multicasts events to Subscribers that are currently subscribed to it.

The subject does not coordinate backpressure for its subscribers and implements a weaker onSubscribe which calls requests Long.MAX_VALUE from the incoming Subscriptions. This makes it possible to subscribe the PublishSubject to multiple sources (note on serialization though) unlike the standard contract on Subscriber. Child subscribers, however, are not overflown but receive an IllegalStateException in case their requested amount is zero.

The implementation of onXXX methods are technically thread-safe but non-serialized calls to them may lead to undefined state in the currently subscribed Subscribers.

Due to the nature Flowables are constructed, the PublishProcessor can't be instantiated through new but must be created via the create() method. Example usage:

 PublishProcessor<Object> processor = PublishProcessor.create();
  // subscriber1 will receive all onNext and onComplete events
  processor.subscribe(subscriber1);
  processor.onNext("one");
  processor.onNext("two");
  // subscriber2 will only receive "three" and onComplete
  processor.subscribe(subscriber2);
  processor.onNext("three");
  processor.onComplete();

   

Method Summary

Methods

Modifier and Type	Method and Description
static <T> PublishProcessor<T>	create() Constructs a PublishProcessor.
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	hasSubscribers() Returns true if the subject has subscribers.
boolean	hasThrowable() Returns true if the subject has reached a terminal state through an error event.
boolean	offer(T t) Tries to emit the item to all currently subscribed Subscribers if all of them has requested some value, returns false otherwise.
void	onComplete()
void	onError(java.lang.Throwable t)
void	onNext(T t)
void	onSubscribe(org.reactivestreams.Subscription s) Implementors of this method should make sure everything that needs to be visible in Subscriber.onNext(Object) is established before calling Subscription.request(long).
void	subscribeActual(org.reactivestreams.Subscriber<? super T> t) Operator implementations (both source and intermediate) should implement this method that performs the necessary business logic.

Methods inherited from class io.reactivex.processors.FlowableProcessor

toSerialized

Methods inherited from class io.reactivex.Flowable

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, 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, doOnCancel, doOnComplete, doOnEach, doOnEach, doOnError, doOnLifecycle, doOnNext, doOnRequest, 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, 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, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureDrop, onBackpressureDrop, onBackpressureLatest, onErrorResumeNext, onErrorResumeNext, onErrorReturn, onErrorReturnItem, onExceptionResumeNext, onTerminateDetach, parallel, parallel, parallel, publish, publish, publish, publish, range, rangeLong, rebatchRequests, 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, strict, subscribe, subscribe, subscribe, subscribe, subscribe, subscribe, subscribe, subscribeOn, subscribeWith, switchIfEmpty, switchMap, switchMap, switchMapDelayError, switchMapDelayError, switchOnNext, switchOnNext, switchOnNextDelayError, switchOnNextDelayError, take, take, take, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeLast, takeUntil, takeUntil, takeWhile, test, 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, toFuture, toList, toList, toList, toMap, toMap, toMap, toMultimap, toMultimap, toMultimap, toMultimap, toObservable, 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, 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

Methods inherited from interface org.reactivestreams.Publisher

subscribe

Method Detail

create

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

Constructs a PublishProcessor.

Type Parameters:

T - the value type

Returns:

the new PublishProcessor

subscribeActual

public void subscribeActual(org.reactivestreams.Subscriber<? super T> t)

Description copied from class: Flowable

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 Flowable instance or the Subscriber.

Specified by:

subscribeActual in class Flowable<T>

Parameters:

t - the incoming Subscriber, never null

onSubscribe

public void onSubscribe(org.reactivestreams.Subscription s)

Description copied from interface: FlowableSubscriber

Implementors of this method should make sure everything that needs to be visible in Subscriber.onNext(Object) is established before calling Subscription.request(long). In practice this means no initialization should happen after the request() call and additional behavior is thread safe in respect to onNext.

onNext

public void onNext(T t)

onError

public void onError(java.lang.Throwable t)

onComplete

public void onComplete()

offer

public boolean offer(T t)

Tries to emit the item to all currently subscribed Subscribers if all of them has requested some value, returns false otherwise.

This method should be called in a sequential manner just like the onXXX methods of the PublishProcessor.

Calling with null will terminate the PublishProcessor and a NullPointerException is signalled to the Subscribers.

Parameters:

t - the item to emit, not null

Returns:

true if the item was emitted to all Subscribers

Since:

2.0.8 - experimental

hasSubscribers

public boolean hasSubscribers()

Description copied from class: FlowableProcessor

Returns true if the subject has subscribers.

The method is thread-safe.

Specified by:

hasSubscribers in class FlowableProcessor<T>

Returns:

true if the subject has subscribers

getThrowable

public java.lang.Throwable getThrowable()

Description copied from class: FlowableProcessor

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 FlowableProcessor<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: FlowableProcessor

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

The method is thread-safe.

Specified by:

hasThrowable in class FlowableProcessor<T>

Returns:

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

See Also:

FlowableProcessor.getThrowable(), FlowableProcessor.hasComplete()

hasComplete

public boolean hasComplete()

Description copied from class: FlowableProcessor

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

The method is thread-safe.

Specified by:

hasComplete in class FlowableProcessor<T>

Returns:

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

See Also:

FlowableProcessor.hasThrowable()