Package io.reactivex.rxjava3.internal.jdk8

Class FlowableMapOptional.MapOptionalSubscriber<T,R>

java.lang.Object

io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber<T,R>

io.reactivex.rxjava3.internal.jdk8.FlowableMapOptional.MapOptionalSubscriber<T,R>

All Implemented Interfaces:

FlowableSubscriber<T>, ConditionalSubscriber<T>, QueueFuseable<R>, QueueSubscription<R>, SimpleQueue<R>, org.reactivestreams.Subscriber<T>, org.reactivestreams.Subscription

Enclosing class:

FlowableMapOptional<T,R>

static final class FlowableMapOptional.MapOptionalSubscriber<T,R>
extends BasicFuseableSubscriber<T,R>
implements ConditionalSubscriber<T>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final Function<? super T,Optional<? extends R>>	mapper

Fields inherited from class io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber

done, downstream, qs, sourceMode, upstream

Fields inherited from interface io.reactivex.rxjava3.operators.QueueFuseable

ANY, ASYNC, BOUNDARY, NONE, SYNC

Constructor Summary

Constructors

Constructor	Description
MapOptionalSubscriber(org.reactivestreams.Subscriber<? super R> downstream, Function<? super T,Optional<? extends R>> mapper)

Method Summary

Modifier and Type	Method	Description
void	onNext(T t)
R	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.
boolean	tryOnNext(T t)	Conditionally takes the value.

Methods inherited from class io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber

afterDownstream, beforeDownstream, cancel, clear, fail, isEmpty, offer, offer, onComplete, onError, onSubscribe, request, transitiveBoundaryFusion

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.reactivex.rxjava3.core.FlowableSubscriber

onSubscribe

Methods inherited from interface org.reactivestreams.Subscriber

onComplete, onError

Field Details

mapper

final Function<? super T,Optional<? extends R>> mapper

Constructor Details

MapOptionalSubscriber

MapOptionalSubscriber(org.reactivestreams.Subscriber<? super R> downstream,
 Function<? super T,Optional<? extends R>> mapper)

Method Details

onNext

public void onNext(T t)

Specified by:

onNext in interface org.reactivestreams.Subscriber<T>

tryOnNext

public boolean tryOnNext(T t)

Description copied from interface: ConditionalSubscriber

Conditionally takes the value.

Specified by:

tryOnNext in interface ConditionalSubscriber<T>

Parameters:

t - the value to deliver

Returns:

true if the value has been accepted, false if the value has been rejected and the next value can be sent immediately

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.

Specified by:

requestFusion in interface QueueFuseable<T>

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

public R 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.

Specified by:

poll in interface SimpleQueue<T>

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.