Package io.reactivex.rxjava3.internal.operators.maybe

Class MaybeMergeArray.MergeMaybeObserver<T>

java.lang.Object

java.lang.Number

java.util.concurrent.atomic.AtomicInteger

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

io.reactivex.rxjava3.internal.operators.maybe.MaybeMergeArray.MergeMaybeObserver<T>

All Implemented Interfaces:

MaybeObserver<T>, QueueFuseable<T>, QueueSubscription<T>, SimpleQueue<T>, java.io.Serializable, org.reactivestreams.Subscription

Enclosing class:

MaybeMergeArray<T>

static final class MaybeMergeArray.MergeMaybeObserver<T>
extends BasicIntQueueSubscription<T>
implements MaybeObserver<T>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) boolean	cancelled
(package private) long	consumed
(package private) org.reactivestreams.Subscriber<? super T>	downstream
(package private) AtomicThrowable	errors
(package private) boolean	outputFused
(package private) MaybeMergeArray.SimpleQueueWithConsumerIndex<java.lang.Object>	queue
(package private) java.util.concurrent.atomic.AtomicLong	requested
private static long	serialVersionUID
(package private) CompositeDisposable	set
(package private) int	sourceCount

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

ANY, ASYNC, BOUNDARY, NONE, SYNC

Constructor Summary

Constructors

Constructor	Description
MergeMaybeObserver(org.reactivestreams.Subscriber<? super T> actual, int sourceCount, MaybeMergeArray.SimpleQueueWithConsumerIndex<java.lang.Object> queue)

Method Summary

Modifier and Type	Method	Description
void	cancel()
void	clear()	Removes all enqueued items from this queue.
(package private) void	drain()
(package private) void	drainFused()
(package private) void	drainNormal()
(package private) boolean	isCancelled()
boolean	isEmpty()	Returns true if the queue is empty.
void	onComplete()	Called once the deferred computation completes normally.
void	onError(java.lang.Throwable e)	Notifies the MaybeObserver that the Maybe has experienced an error condition.
void	onSubscribe(Disposable d)	Provides the MaybeObserver with the means of cancelling (disposing) the connection (channel) with the Maybe in both synchronous (from within onSubscribe(Disposable) itself) and asynchronous manner.
void	onSuccess(T value)	Notifies the MaybeObserver with one item and that the Maybe has finished sending push-based notifications.
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 io.reactivex.rxjava3.internal.subscriptions.BasicIntQueueSubscription

offer, offer

Methods inherited from class java.util.concurrent.atomic.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 java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

downstream

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

set

final CompositeDisposable set

requested

final java.util.concurrent.atomic.AtomicLong requested

queue

final MaybeMergeArray.SimpleQueueWithConsumerIndex<java.lang.Object> queue

errors

final AtomicThrowable errors

sourceCount

final int sourceCount

cancelled

volatile boolean cancelled

outputFused

boolean outputFused

consumed

long consumed

Constructor Detail

MergeMaybeObserver

MergeMaybeObserver(org.reactivestreams.Subscriber<? super T> actual,
                   int sourceCount,
                   MaybeMergeArray.SimpleQueueWithConsumerIndex<java.lang.Object> queue)

Method Detail

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

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

clear

public void clear()

Description copied from interface: SimpleQueue

Removes all enqueued items from this queue.

Specified by:

clear in interface SimpleQueue<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

onSubscribe

public void onSubscribe(Disposable d)

Description copied from interface: MaybeObserver

Provides the MaybeObserver with the means of cancelling (disposing) the connection (channel) with the Maybe in both synchronous (from within onSubscribe(Disposable) itself) and asynchronous manner.

Specified by:

onSubscribe in interface MaybeObserver<T>

Parameters:

d - the Disposable instance whose Disposable.dispose() can be called anytime to cancel the connection

onSuccess

public void onSuccess(T value)

Description copied from interface: MaybeObserver

Notifies the MaybeObserver with one item and that the Maybe has finished sending push-based notifications.

The Maybe will not call this method if it calls MaybeObserver.onError(java.lang.Throwable).

Specified by:

onSuccess in interface MaybeObserver<T>

Parameters:

value - the item emitted by the Maybe

onError

public void onError(java.lang.Throwable e)

Description copied from interface: MaybeObserver

Notifies the MaybeObserver that the Maybe has experienced an error condition.

If the Maybe calls this method, it will not thereafter call MaybeObserver.onSuccess(T).

Specified by:

onError in interface MaybeObserver<T>

Parameters:

e - the exception encountered by the Maybe

onComplete

public void onComplete()

Description copied from interface: MaybeObserver

Called once the deferred computation completes normally.

Specified by:

onComplete in interface MaybeObserver<T>

isCancelled

boolean isCancelled()

drainNormal

void drainNormal()

drainFused

void drainFused()

drain

void drain()