Class FlowableDistinctUntilChanged.DistinctUntilChangedConditionalSubscriber<T,K>

java.lang.Object

io.reactivex.rxjava3.internal.subscribers.BasicFuseableConditionalSubscriber<T,T>

io.reactivex.rxjava3.internal.operators.flowable.FlowableDistinctUntilChanged.DistinctUntilChangedConditionalSubscriber<T,K>

All Implemented Interfaces:

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

Enclosing class:

FlowableDistinctUntilChanged<T,K>

static final class FlowableDistinctUntilChanged.DistinctUntilChangedConditionalSubscriber<T,K>
extends BasicFuseableConditionalSubscriber<T,T>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final BiPredicate<? super K, ? super K>	comparer
(package private) boolean	hasValue
(package private) final Function<? super T, K>	keySelector
(package private) K	last

Fields inherited from class BasicFuseableConditionalSubscriber

done, downstream, qs, sourceMode, upstream

Fields inherited from interface QueueFuseable

ANY, ASYNC, BOUNDARY, NONE, SYNC

Constructor Summary

Constructors

Constructor	Description
DistinctUntilChangedConditionalSubscriber(ConditionalSubscriber<? super T> actual, Function<? super T, K> keySelector, BiPredicate<? super K, ? super K> comparer)

Method Summary

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

Methods inherited from class BasicFuseableConditionalSubscriber

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

Methods inherited from class Object

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

Field Details

keySelector

final Function<? super T, K> keySelector

comparer

final BiPredicate<? super K, ? super K> comparer

last

K last

hasValue

boolean hasValue

Constructor Details

DistinctUntilChangedConditionalSubscriber

DistinctUntilChangedConditionalSubscriber(ConditionalSubscriber<? super T> actual,
 Function<? super T, K> keySelector,
 BiPredicate<? super K, ? super K> comparer)

Method Details

onNext

public void onNext(T t)

tryOnNext

public boolean tryOnNext(T t)

Description copied from interface: ConditionalSubscriber

Conditionally takes the value.

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.

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.