Class FutureObserver<T>

java.lang.Object

java.util.concurrent.CountDownLatch

io.reactivex.rxjava3.internal.observers.FutureObserver<T>

Type Parameters:

T - the value type

All Implemented Interfaces:

Observer<T>, Disposable, Future<T>

public final class FutureObserver<T>
extends CountDownLatch
implements Observer<T>, Future<T>, Disposable

An Observer + Future that expects exactly one upstream value and provides it via the (blocking) Future API.

Nested Class Summary

Nested classes/interfaces inherited from interface Future

Future.State

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Throwable	error
(package private) final AtomicReference<Disposable>	upstream
(package private) T	value

Constructor Summary

Constructors

Constructor	Description
FutureObserver()

Method Summary

Modifier and Type	Method	Description
boolean	cancel(boolean mayInterruptIfRunning)
void	dispose()	Dispose the resource, the operation should be idempotent.
T	get()
T	get(long timeout, @NonNull TimeUnit unit)
boolean	isCancelled()
boolean	isDisposed()	Returns true if this resource has been disposed.
boolean	isDone()
void	onComplete()	Notifies the Observer that the Observable has finished sending push-based notifications.
void	onError(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 d)	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.

Methods inherited from class CountDownLatch

await, await, countDown, getCount, toString

Methods inherited from class Object

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

Methods inherited from interface Future

exceptionNow, resultNow, state

Field Details

value

T value

error

Throwable error

upstream

final AtomicReference<Disposable> upstream

Constructor Details

FutureObserver

public FutureObserver()

Method Details

cancel

public boolean cancel(boolean mayInterruptIfRunning)

Specified by:

cancel in interface Future<T>

isCancelled

public boolean isCancelled()

Specified by:

isCancelled in interface Future<T>

isDone

public boolean isDone()

Specified by:

isDone in interface Future<T>

get

public T get()
      throws InterruptedException,
ExecutionException

Specified by:

get in interface Future<T>

Throws:

InterruptedException

ExecutionException

get

public T get(long timeout,
 @NonNull
 @NonNull TimeUnit unit)
      throws InterruptedException,
ExecutionException,
TimeoutException

Specified by:

get in interface Future<T>

Throws:

InterruptedException

ExecutionException

TimeoutException

onSubscribe

public void onSubscribe(Disposable d)

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.

Specified by:

onSubscribe in interface Observer<T>

Parameters:

d - 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(Throwable).

Specified by:

onNext in interface Observer<T>

Parameters:

t - the item emitted by the Observable

onError

public void onError(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().

Specified by:

onError in interface Observer<T>

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(Throwable).

Specified by:

onComplete in interface Observer<T>

dispose

public void dispose()

Description copied from interface: Disposable

Dispose the resource, the operation should be idempotent.

Specified by:

dispose in interface Disposable

isDisposed

public boolean isDisposed()

Description copied from interface: Disposable

Returns true if this resource has been disposed.

Specified by:

isDisposed in interface Disposable

Returns:

true if this resource has been disposed