Class ObservableDistinct.DistinctObserver<T,K>

java.lang.Object

io.reactivex.rxjava3.internal.observers.BasicFuseableObserver<T,T>

io.reactivex.rxjava3.internal.operators.observable.ObservableDistinct.DistinctObserver<T,K>

All Implemented Interfaces:

Observer<T>, Disposable, QueueDisposable<T>, QueueFuseable<T>, SimpleQueue<T>

Enclosing class:

ObservableDistinct<T,K>

static final class ObservableDistinct.DistinctObserver<T,K>
extends BasicFuseableObserver<T,T>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final Collection<? super K>	collection
(package private) final Function<? super T, K>	keySelector

Fields inherited from class BasicFuseableObserver

done, downstream, qd, sourceMode, upstream

Fields inherited from interface QueueFuseable

ANY, ASYNC, BOUNDARY, NONE, SYNC

Constructor Summary

Constructors

Constructor	Description
DistinctObserver(Observer<? super T> actual, Function<? super T, K> keySelector, Collection<? super K> collection)

Method Summary

Modifier and Type	Method	Description
void	clear()	Removes all enqueued items from this queue.
void	onComplete()	Notifies the Observer that the Observable has finished sending push-based notifications.
void	onError(Throwable e)	Notifies the Observer that the Observable has experienced an error condition.
void	onNext(T value)	Provides the Observer with a new item to observe.
T	poll()	Tries to dequeue a value (non-null) or returns null if the queue is empty.
int	requestFusion(int mode)	Request a fusion mode from the upstream.

Methods inherited from class BasicFuseableObserver

afterDownstream, beforeDownstream, dispose, fail, isDisposed, isEmpty, offer, offer, onSubscribe, transitiveBoundaryFusion

Methods inherited from class Object

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

Field Details

collection

final Collection<? super K> collection

keySelector

final Function<? super T, K> keySelector

Constructor Details

DistinctObserver

DistinctObserver(Observer<? super T> actual,
 Function<? super T, K> keySelector,
 Collection<? super K> collection)

Method Details

onNext

public void onNext(T value)

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).

Parameters:

value - the item emitted by the Observable

onError

public void onError(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.onComplete().

Specified by:

onError in interface Observer<T>

Overrides:

onError in class BasicFuseableObserver<T,T>

Parameters:

e - 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>

Overrides:

onComplete in class BasicFuseableObserver<T,T>

requestFusion

public int requestFusion(int mode)

Description copied from interface: QueueFuseable

Request a fusion mode from the upstream.

This should be called before onSubscribe returns.

Calling this method multiple times or after onSubscribe finished is not allowed and may result in undefined behavior.

Parameters:

mode - the requested fusion mode, allowed values are QueueFuseable.SYNC, QueueFuseable.ASYNC, QueueFuseable.ANY combined with QueueFuseable.BOUNDARY (e.g., requestFusion(SYNC | BOUNDARY)).

Returns:

the established fusion mode: QueueFuseable.NONE, QueueFuseable.SYNC, QueueFuseable.ASYNC.

poll

@Nullable
public T poll()
       throws Throwable

Description copied from interface: SimpleQueue

Tries to dequeue a value (non-null) or returns null if the queue is empty.

If the producer uses SimpleQueue.offer(Object, Object) and when polling in pairs, if the first poll() returns a non-null item, the second poll() is guaranteed to return a non-null item as well.

Returns:

the item or null to indicate an empty queue

Throws:

Throwable - if some pre-processing of the dequeued item (usually through fused functions) throws.

clear

public void clear()

Description copied from interface: SimpleQueue

Removes all enqueued items from this queue.

Specified by:

clear in interface SimpleQueue<T>

Overrides:

clear in class BasicFuseableObserver<T,T>