rx.subjects

Class Subject<T,R>

java.lang.Object

rx.Observable<R>

rx.subjects.Subject<T,R>

Type Parameters:

T - the input value type

R - the output value type

All Implemented Interfaces:

Observer<T>

Direct Known Subclasses:

AsyncSubject, BehaviorSubject, PublishSubject, ReplaySubject, SerializedSubject, TestSubject, UnicastSubject

public abstract class Subject<T,R>
extends Observable<R>
implements Observer<T>

Represents an object that is both an Observable and an Observer.

Nested Class Summary

Nested classes/interfaces inherited from class rx.Observable

Observable.OnSubscribe<T>, Observable.Operator<R,T>, Observable.Transformer<T,R>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Subject(Observable.OnSubscribe<R> onSubscribe)

Method Summary

Modifier and Type	Method and Description
abstract boolean	hasObservers() Indicates whether the Subject has Observers subscribed to it.
SerializedSubject<T,R>	toSerialized() Wraps a Subject so that it is safe to call its various on methods from different threads.

Methods inherited from class rx.Observable

all, amb, amb, amb, amb, amb, amb, amb, amb, amb, ambWith, asObservable, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, buffer, cache, cache, cacheWithInitialCapacity, cast, collect, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatest, combineLatestDelayError, compose, concat, concat, concat, concat, concat, concat, concat, concat, concat, concat, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatDelayError, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatEager, concatMap, concatMapDelayError, concatMapEager, concatMapEager, concatMapEager, concatMapIterable, concatWith, contains, count, countLong, create, create, create, create, debounce, debounce, debounce, defaultIfEmpty, defer, delay, delay, delay, delay, delaySubscription, delaySubscription, delaySubscription, delaySubscription, dematerialize, distinct, distinct, distinctUntilChanged, distinctUntilChanged, distinctUntilChanged, doAfterTerminate, doOnCompleted, doOnEach, doOnEach, doOnError, doOnNext, doOnRequest, doOnSubscribe, doOnTerminate, doOnUnsubscribe, elementAt, elementAtOrDefault, empty, error, exists, filter, finallyDo, first, first, firstOrDefault, firstOrDefault, flatMap, flatMap, flatMap, flatMap, flatMap, flatMap, flatMapCompletable, flatMapCompletable, flatMapCompletable, flatMapIterable, flatMapIterable, flatMapIterable, flatMapIterable, flatMapSingle, flatMapSingle, flatMapSingle, forEach, forEach, forEach, from, from, from, from, from, fromCallable, groupBy, groupBy, groupBy, groupBy, groupJoin, ignoreElements, interval, interval, interval, interval, isEmpty, join, just, just, just, just, just, just, just, just, just, just, last, last, lastOrDefault, lastOrDefault, lift, limit, map, materialize, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, merge, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeDelayError, mergeWith, nest, never, observeOn, observeOn, observeOn, observeOn, ofType, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureBuffer, onBackpressureDrop, onBackpressureDrop, onBackpressureLatest, onErrorResumeNext, onErrorResumeNext, onErrorReturn, onExceptionResumeNext, onTerminateDetach, publish, publish, range, range, rebatchRequests, reduce, reduce, repeat, repeat, repeat, repeat, repeatWhen, repeatWhen, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, replay, retry, retry, retry, retryWhen, retryWhen, sample, sample, sample, scan, scan, sequenceEqual, sequenceEqual, serialize, share, single, single, singleOrDefault, singleOrDefault, skip, skip, skip, skipLast, skipLast, skipLast, skipUntil, skipWhile, sorted, sorted, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, startWith, subscribe, subscribe, subscribe, subscribe, subscribe, subscribe, subscribeOn, subscribeOn, switchIfEmpty, switchMap, switchMapDelayError, switchOnNext, switchOnNextDelayError, take, take, take, takeFirst, takeLast, takeLast, takeLast, takeLast, takeLast, takeLastBuffer, takeLastBuffer, takeLastBuffer, takeLastBuffer, takeLastBuffer, takeUntil, takeUntil, takeWhile, test, test, throttleFirst, throttleFirst, throttleLast, throttleLast, throttleWithTimeout, throttleWithTimeout, timeInterval, timeInterval, timeout, timeout, timeout, timeout, timeout, timeout, timeout, timeout, timer, timer, timer, timer, timestamp, timestamp, to, toBlocking, toCompletable, toList, toMap, toMap, toMap, toMultimap, toMultimap, toMultimap, toMultimap, toSingle, toSortedList, toSortedList, toSortedList, toSortedList, unsafeCreate, unsafeSubscribe, unsubscribeOn, using, using, window, window, window, window, window, window, window, window, window, window, window, window, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, withLatestFrom, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zip, zipWith, zipWith

Methods inherited from class java.lang.Object

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

Methods inherited from interface rx.Observer

onCompleted, onError, onNext

Constructor Detail

Subject

protected Subject(Observable.OnSubscribe<R> onSubscribe)

Method Detail

hasObservers

public abstract boolean hasObservers()

Indicates whether the Subject has Observers subscribed to it.

Returns:

true if there is at least one Observer subscribed to this Subject, false otherwise

toSerialized

public final SerializedSubject<T,R> toSerialized()

Wraps a Subject so that it is safe to call its various on methods from different threads.

When you use an ordinary Subject as a Subscriber, you must take care not to call its Observer.onNext(T) method (or its other on methods) from multiple threads, as this could lead to non-serialized calls, which violates the Observable contract and creates an ambiguity in the resulting Subject.

To protect a Subject from this danger, you can convert it into a SerializedSubject with code like the following:

 mySafeSubject = myUnsafeSubject.toSerialized();
 

Returns:

SerializedSubject wrapping the current Subject