rx.subjects

Class SerializedSubject<T,R>

java.lang.Object

rx.Observable<R>

rx.subjects.Subject<T,R>

rx.subjects.SerializedSubject<T,R>

Type Parameters:

T - the input value type

R - the output value type

All Implemented Interfaces:

Observer<T>

public class SerializedSubject<T,R>
extends Subject<T,R>

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 = new SerializedSubject( myUnsafeSubject );
 

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

Constructor and Description
SerializedSubject(Subject<T,R> actual)

Method Summary

Modifier and Type	Method and Description
boolean	hasObservers() Indicates whether the Subject has Observers subscribed to it.
void	onCompleted() Notifies the Observer that the Observable has finished sending push-based notifications.
void	onError(java.lang.Throwable e) Notifies the Observer that the Observable has experienced an error condition.
void	onNext(T t) Provides the Observer with a new item to observe.

Methods inherited from class rx.subjects.Subject

toSerialized

Methods inherited from class rx.Observable

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Methods inherited from class java.lang.Object

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

Constructor Detail

SerializedSubject

public SerializedSubject(Subject<T,R> actual)

Method Detail

onCompleted

public void onCompleted()

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).

onError

public void onError(java.lang.Throwable e)

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.onCompleted().

Parameters:

e - the exception encountered by the Observable

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.onCompleted() or Observer.onError(java.lang.Throwable).

Parameters:

t - the item emitted by the Observable

hasObservers

public boolean hasObservers()

Description copied from class: Subject

Indicates whether the Subject has Observers subscribed to it.

Specified by:

hasObservers in class Subject<T,R>

Returns:

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