Class FlowableOnBackpressureBuffer.BackpressureBufferSubscriber<T>

java.lang.Object

java.lang.Number

java.util.concurrent.atomic.AtomicInteger

io.reactivex.rxjava3.internal.subscriptions.BasicIntQueueSubscription<T>

io.reactivex.rxjava3.internal.operators.flowable.FlowableOnBackpressureBuffer.BackpressureBufferSubscriber<T>

All Implemented Interfaces:

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

Enclosing class:

FlowableOnBackpressureBuffer<T>

static final class FlowableOnBackpressureBuffer.BackpressureBufferSubscriber<T>
extends BasicIntQueueSubscription<T>
implements FlowableSubscriber<T>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) boolean	cancelled
(package private) final boolean	delayError
(package private) boolean	done
(package private) final org.reactivestreams.Subscriber<? super T>	downstream
(package private) Throwable	error
(package private) final Consumer<? super T>	onDropped
(package private) final Action	onOverflow
(package private) boolean	outputFused
(package private) final SimplePlainQueue<T>	queue
(package private) final AtomicLong	requested
private static final long	serialVersionUID
(package private) org.reactivestreams.Subscription	upstream

Fields inherited from interface QueueFuseable

ANY, ASYNC, BOUNDARY, NONE, SYNC

Constructor Summary

Constructors

Constructor	Description
BackpressureBufferSubscriber(org.reactivestreams.Subscriber<? super T> actual, int bufferSize, boolean unbounded, boolean delayError, Action onOverflow, Consumer<? super T> onDropped)

Method Summary

Modifier and Type	Method	Description
void	cancel()
(package private) boolean	checkTerminated(boolean d, boolean empty, org.reactivestreams.Subscriber<? super T> a)
void	clear()	Removes all enqueued items from this queue.
(package private) void	drain()
boolean	isEmpty()	Returns true if the queue is empty.
void	onComplete()
void	onError(Throwable t)
void	onNext(T t)
void	onSubscribe(org.reactivestreams.Subscription s)	Implementors of this method should make sure everything that needs to be visible in Subscriber.onNext(Object) is established before calling Subscription.request(long).
T	poll()	Tries to dequeue a value (non-null) or returns null if the queue is empty.
void	request(long n)
int	requestFusion(int mode)	Request a fusion mode from the upstream.

Methods inherited from class BasicIntQueueSubscription

offer, offer

Methods inherited from class AtomicInteger

accumulateAndGet, addAndGet, compareAndExchange, compareAndExchangeAcquire, compareAndExchangeRelease, compareAndSet, decrementAndGet, doubleValue, floatValue, get, getAcquire, getAndAccumulate, getAndAdd, getAndDecrement, getAndIncrement, getAndSet, getAndUpdate, getOpaque, getPlain, incrementAndGet, intValue, lazySet, longValue, set, setOpaque, setPlain, setRelease, toString, updateAndGet, weakCompareAndSet, weakCompareAndSetAcquire, weakCompareAndSetPlain, weakCompareAndSetRelease, weakCompareAndSetVolatile

Methods inherited from class Number

byteValue, shortValue

Methods inherited from class Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

downstream

final org.reactivestreams.Subscriber<? super T> downstream

queue

final SimplePlainQueue<T> queue

delayError

final boolean delayError

onOverflow

final Action onOverflow

onDropped

final Consumer<? super T> onDropped

upstream

org.reactivestreams.Subscription upstream

cancelled

volatile boolean cancelled

done

volatile boolean done

error

Throwable error

requested

final AtomicLong requested

outputFused

boolean outputFused

Constructor Details

BackpressureBufferSubscriber

BackpressureBufferSubscriber(org.reactivestreams.Subscriber<? super T> actual,
 int bufferSize,
 boolean unbounded,
 boolean delayError,
 Action onOverflow,
 Consumer<? super T> onDropped)

Method Details

onSubscribe

public void onSubscribe(org.reactivestreams.Subscription s)

Description copied from interface: FlowableSubscriber

Implementors of this method should make sure everything that needs to be visible in Subscriber.onNext(Object) is established before calling Subscription.request(long). In practice this means no initialization should happen after the request() call and additional behavior is thread safe in respect to onNext.

Specified by:

onSubscribe in interface FlowableSubscriber<T>

Specified by:

onSubscribe in interface org.reactivestreams.Subscriber<T>

onNext

public void onNext(T t)

Specified by:

onNext in interface org.reactivestreams.Subscriber<T>

onError

public void onError(Throwable t)

Specified by:

onError in interface org.reactivestreams.Subscriber<T>

onComplete

public void onComplete()

Specified by:

onComplete in interface org.reactivestreams.Subscriber<T>

request

public void request(long n)

Specified by:

request in interface org.reactivestreams.Subscription

cancel

public void cancel()

Specified by:

cancel in interface org.reactivestreams.Subscription

drain

void drain()

checkTerminated

boolean checkTerminated(boolean d,
 boolean empty,
 org.reactivestreams.Subscriber<? super T> a)

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

@Nullable
public T poll()

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

clear

public void clear()

Description copied from interface: SimpleQueue

Removes all enqueued items from this queue.

Specified by:

clear in interface SimpleQueue<T>

isEmpty

public boolean isEmpty()

Description copied from interface: SimpleQueue

Returns true if the queue is empty.

Note however that due to potential fused functions in SimpleQueue.poll() it is possible this method returns false but then poll() returns null because the fused function swallowed the available item(s).

Specified by:

isEmpty in interface SimpleQueue<T>

Returns:

true if the queue is empty