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

Class MaybeMergeArray.MpscFillOnceSimpleQueue<T>

java.lang.Object

java.util.concurrent.atomic.AtomicReferenceArray<T>

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

All Implemented Interfaces:

MaybeMergeArray.SimpleQueueWithConsumerIndex<T>, SimpleQueue<T>, java.io.Serializable

Enclosing class:

MaybeMergeArray<T>

static final class MaybeMergeArray.MpscFillOnceSimpleQueue<T>
extends java.util.concurrent.atomic.AtomicReferenceArray<T>
implements MaybeMergeArray.SimpleQueueWithConsumerIndex<T>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	consumerIndex
(package private) java.util.concurrent.atomic.AtomicInteger	producerIndex
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
MpscFillOnceSimpleQueue(int length)

Method Summary

Modifier and Type	Method	Description
void	clear()	Removes all enqueued items from this queue.
int	consumerIndex()
void	drop()
boolean	isEmpty()	Returns true if the queue is empty.
boolean	offer(T value)	Atomically enqueue a single value.
boolean	offer(T v1, T v2)	Atomically enqueue two values.
T	peek()
T	poll()	Tries to dequeue a value (non-null) or returns null if the queue is empty.
int	producerIndex()

Methods inherited from class java.util.concurrent.atomic.AtomicReferenceArray

accumulateAndGet, compareAndExchange, compareAndExchangeAcquire, compareAndExchangeRelease, compareAndSet, get, getAcquire, getAndAccumulate, getAndSet, getAndUpdate, getOpaque, getPlain, lazySet, length, set, setOpaque, setPlain, setRelease, toString, updateAndGet, weakCompareAndSet, weakCompareAndSetAcquire, weakCompareAndSetPlain, weakCompareAndSetRelease, weakCompareAndSetVolatile

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

producerIndex

final java.util.concurrent.atomic.AtomicInteger producerIndex

consumerIndex

int consumerIndex

Constructor Detail

MpscFillOnceSimpleQueue

MpscFillOnceSimpleQueue(int length)

Method Detail

offer

public boolean offer(T value)

Description copied from interface: SimpleQueue

Atomically enqueue a single value.

Specified by:

offer in interface SimpleQueue<T>

Parameters:

value - the value to enqueue, not null

Returns:

true if successful, false if the value was not enqueued likely due to reaching the queue capacity)

offer

public boolean offer(T v1,
                     T v2)

Description copied from interface: SimpleQueue

Atomically enqueue two values.

Specified by:

offer in interface SimpleQueue<T>

Parameters:

v1 - the first value to enqueue, not null

v2 - the second value to enqueue, not null

Returns:

true if successful, false if the value was not enqueued likely due to reaching the queue capacity)

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 MaybeMergeArray.SimpleQueueWithConsumerIndex<T>

Specified by:

poll in interface SimpleQueue<T>

Returns:

the item or null to indicate an empty queue

peek

public T peek()

Specified by:

peek in interface MaybeMergeArray.SimpleQueueWithConsumerIndex<T>

drop

public void drop()

Specified by:

drop in interface MaybeMergeArray.SimpleQueueWithConsumerIndex<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

clear

public void clear()

Description copied from interface: SimpleQueue

Removes all enqueued items from this queue.

Specified by:

clear in interface SimpleQueue<T>

consumerIndex

public int consumerIndex()

Specified by:

consumerIndex in interface MaybeMergeArray.SimpleQueueWithConsumerIndex<T>

producerIndex

public int producerIndex()

Specified by:

producerIndex in interface MaybeMergeArray.SimpleQueueWithConsumerIndex<T>