Class MaybeMergeArray.MpscFillOnceSimpleQueue<T>
- java.lang.Object
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- java.util.concurrent.atomic.AtomicReferenceArray<T>
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- io.reactivex.rxjava3.internal.operators.maybe.MaybeMergeArray.MpscFillOnceSimpleQueue<T>
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- 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>
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Field Summary
Fields Modifier and Type Field Description (package private) int
consumerIndex
(package private) java.util.concurrent.atomic.AtomicInteger
producerIndex
private static long
serialVersionUID
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Constructor Summary
Constructors Constructor Description MpscFillOnceSimpleQueue(int length)
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Method Summary
All Methods Instance Methods Concrete Methods 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()
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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
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Field Detail
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serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
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producerIndex
final java.util.concurrent.atomic.AtomicInteger producerIndex
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consumerIndex
int consumerIndex
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Method Detail
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offer
public boolean offer(T value)
Description copied from interface:SimpleQueue
Atomically enqueue a single value.- Specified by:
offer
in interfaceSimpleQueue<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)
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offer
public boolean offer(T v1, T v2)
Description copied from interface:SimpleQueue
Atomically enqueue two values.- Specified by:
offer
in interfaceSimpleQueue<T>
- Parameters:
v1
- the first value to enqueue, not nullv2
- 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)
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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 interfaceMaybeMergeArray.SimpleQueueWithConsumerIndex<T>
- Specified by:
poll
in interfaceSimpleQueue<T>
- Returns:
- the item or null to indicate an empty queue
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peek
public T peek()
- Specified by:
peek
in interfaceMaybeMergeArray.SimpleQueueWithConsumerIndex<T>
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drop
public void drop()
- Specified by:
drop
in interfaceMaybeMergeArray.SimpleQueueWithConsumerIndex<T>
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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 interfaceSimpleQueue<T>
- Returns:
- true if the queue is empty
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clear
public void clear()
Description copied from interface:SimpleQueue
Removes all enqueued items from this queue.- Specified by:
clear
in interfaceSimpleQueue<T>
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consumerIndex
public int consumerIndex()
- Specified by:
consumerIndex
in interfaceMaybeMergeArray.SimpleQueueWithConsumerIndex<T>
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producerIndex
public int producerIndex()
- Specified by:
producerIndex
in interfaceMaybeMergeArray.SimpleQueueWithConsumerIndex<T>
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