Package org.jctools.queues
Class MpmcUnboundedXaddArrayQueue<E>
- java.lang.Object
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- java.util.AbstractCollection<E>
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- java.util.AbstractQueue<E>
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- org.jctools.queues.MpUnboundedXaddArrayQueuePad1<E>
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- org.jctools.queues.MpUnboundedXaddArrayQueueProducerFields<E>
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- org.jctools.queues.MpUnboundedXaddArrayQueuePad2<E>
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- org.jctools.queues.MpUnboundedXaddArrayQueueProducerChunk<R,E>
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- org.jctools.queues.MpUnboundedXaddArrayQueuePad3<R,E>
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- org.jctools.queues.MpUnboundedXaddArrayQueueConsumerFields<R,E>
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- org.jctools.queues.MpUnboundedXaddArrayQueuePad5<R,E>
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- org.jctools.queues.MpUnboundedXaddArrayQueue<MpmcUnboundedXaddChunk<E>,E>
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- org.jctools.queues.MpmcUnboundedXaddArrayQueue<E>
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- All Implemented Interfaces:
java.lang.Iterable<E>
,java.util.Collection<E>
,java.util.Queue<E>
,IndexedQueueSizeUtil.IndexedQueue
,MessagePassingQueue<E>
,QueueProgressIndicators
public class MpmcUnboundedXaddArrayQueue<E> extends MpUnboundedXaddArrayQueue<MpmcUnboundedXaddChunk<E>,E>
An MPMC array queue which grows unbounded in linked chunks.
Differently fromMpmcArrayQueue
it is designed to provide a better scaling when more producers are concurrently offering.
Users should be aware thatpoll()
could spin while awaiting a new element to be available: to avoid this behaviourrelaxedPoll()
should be used instead, accounting for the semantic differences between the twos.
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.jctools.queues.MessagePassingQueue
MessagePassingQueue.Consumer<T>, MessagePassingQueue.ExitCondition, MessagePassingQueue.Supplier<T>, MessagePassingQueue.WaitStrategy
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Field Summary
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Fields inherited from class org.jctools.queues.MpUnboundedXaddArrayQueue
chunkMask, chunkShift, freeChunksPool, maxPooledChunks
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Fields inherited from class org.jctools.queues.MpUnboundedXaddArrayQueuePad5
b000, b001, b002, b003, b004, b005, b006, b007, b010, b011, b012, b013, b014, b015, b016, b017, b020, b021, b022, b023, b024, b025, b026, b027, b030, b031, b032, b033, b034, b035, b036, b037, b040, b041, b042, b043, b044, b045, b046, b047, b050, b051, b052, b053, b054, b055, b056, b057, b060, b061, b062, b063, b064, b065, b066, b067, b070, b071, b072, b073, b074, b075, b076, b077, b100, b101, b102, b103, b104, b105, b106, b107, b110, b111, b112, b113, b114, b115, b116, b117, b120, b121, b122, b123, b124, b125, b126, b127, b130, b131, b132, b133, b134, b135, b136, b137, b140, b141, b142, b143, b144, b145, b146, b147, b150, b151, b152, b153, b154, b155, b156, b157, b160, b161, b162, b163, b164, b165, b166, b167
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Fields inherited from class org.jctools.queues.MpUnboundedXaddArrayQueuePad1
b170, b171, b172, b173, b174, b175, b176, b177
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Fields inherited from interface org.jctools.queues.MessagePassingQueue
UNBOUNDED_CAPACITY
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Constructor Summary
Constructors Constructor Description MpmcUnboundedXaddArrayQueue(int chunkSize)
MpmcUnboundedXaddArrayQueue(int chunkSize, int maxPooledChunks)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
fill(MessagePassingQueue.Supplier<E> s, int limit)
Stuff the queue with up to limit elements from the supplier.(package private) MpmcUnboundedXaddChunk<E>
newChunk(long index, MpmcUnboundedXaddChunk<E> prev, int chunkSize, boolean pooled)
boolean
offer(E e)
Called from a producer thread subject to the restrictions appropriate to the implementation and according to theQueue.offer(Object)
interface.E
peek()
Called from the consumer thread subject to the restrictions appropriate to the implementation and according to theQueue.peek()
interface.E
poll()
Called from the consumer thread subject to the restrictions appropriate to the implementation and according to theQueue.poll()
interface.E
relaxedPeek()
Called from the consumer thread subject to the restrictions appropriate to the implementation.E
relaxedPoll()
Called from the consumer thread subject to the restrictions appropriate to the implementation.private E
switchToNextConsumerChunkAndPoll(MpmcUnboundedXaddChunk<E> cChunk, MpmcUnboundedXaddChunk<E> next, long expectedChunkIndex)
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Methods inherited from class org.jctools.queues.MpUnboundedXaddArrayQueue
appendNextChunks, capacity, chunkSize, currentConsumerIndex, currentProducerIndex, drain, drain, drain, fill, fill, isEmpty, iterator, maxPooledChunks, moveToNextConsumerChunk, producerChunkForIndex, relaxedOffer, size, toString
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Methods inherited from class org.jctools.queues.MpUnboundedXaddArrayQueueConsumerFields
casConsumerIndex, lpConsumerChunk, lpConsumerIndex, lvConsumerChunk, lvConsumerIndex, soConsumerChunk, soConsumerIndex
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Methods inherited from class org.jctools.queues.MpUnboundedXaddArrayQueueProducerChunk
casProducerChunkIndex, lvProducerChunk, lvProducerChunkIndex, soProducerChunk, soProducerChunkIndex
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Methods inherited from class org.jctools.queues.MpUnboundedXaddArrayQueueProducerFields
getAndAddProducerIndex, getAndIncrementProducerIndex, lvProducerIndex
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Methods inherited from class java.util.AbstractCollection
contains, containsAll, remove, removeAll, retainAll, toArray, toArray
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface java.util.Collection
contains, containsAll, equals, hashCode, parallelStream, remove, removeAll, removeIf, retainAll, spliterator, stream, toArray, toArray, toArray
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Methods inherited from interface org.jctools.queues.MessagePassingQueue
clear
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Constructor Detail
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MpmcUnboundedXaddArrayQueue
public MpmcUnboundedXaddArrayQueue(int chunkSize, int maxPooledChunks)
- Parameters:
chunkSize
- The buffer size to be used in each chunk of this queuemaxPooledChunks
- The maximum number of reused chunks kept around to avoid allocation, chunks are pre-allocated
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MpmcUnboundedXaddArrayQueue
public MpmcUnboundedXaddArrayQueue(int chunkSize)
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Method Detail
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newChunk
final MpmcUnboundedXaddChunk<E> newChunk(long index, MpmcUnboundedXaddChunk<E> prev, int chunkSize, boolean pooled)
- Specified by:
newChunk
in classMpUnboundedXaddArrayQueue<MpmcUnboundedXaddChunk<E>,E>
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offer
public boolean offer(E e)
Description copied from interface:MessagePassingQueue
Called from a producer thread subject to the restrictions appropriate to the implementation and according to theQueue.offer(Object)
interface.- Parameters:
e
- notnull
, will throw NPE if it is- Returns:
- true if element was inserted into the queue, false iff full
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poll
public E poll()
Description copied from interface:MessagePassingQueue
Called from the consumer thread subject to the restrictions appropriate to the implementation and according to theQueue.poll()
interface.- Returns:
- a message from the queue if one is available,
null
iff empty
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switchToNextConsumerChunkAndPoll
private E switchToNextConsumerChunkAndPoll(MpmcUnboundedXaddChunk<E> cChunk, MpmcUnboundedXaddChunk<E> next, long expectedChunkIndex)
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peek
public E peek()
Description copied from interface:MessagePassingQueue
Called from the consumer thread subject to the restrictions appropriate to the implementation and according to theQueue.peek()
interface.- Returns:
- a message from the queue if one is available,
null
iff empty
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relaxedPoll
public E relaxedPoll()
Description copied from interface:MessagePassingQueue
Called from the consumer thread subject to the restrictions appropriate to the implementation. As opposed toQueue.poll()
this method may returnnull
without the queue being empty.- Returns:
- a message from the queue if one is available,
null
if unable to poll
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relaxedPeek
public E relaxedPeek()
Description copied from interface:MessagePassingQueue
Called from the consumer thread subject to the restrictions appropriate to the implementation. As opposed toQueue.peek()
this method may returnnull
without the queue being empty.- Returns:
- a message from the queue if one is available,
null
if unable to peek
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fill
public int fill(MessagePassingQueue.Supplier<E> s, int limit)
Description copied from interface:MessagePassingQueue
Stuff the queue with up to limit elements from the supplier. Semantically similar to:for(int i=0; i < limit && relaxedOffer(s.get()); i++);
There's no strong commitment to the queue being full at the end of a fill. Called from a producer thread subject to the restrictions appropriate to the implementation. WARNING: Explicit assumptions are made with regards to
MessagePassingQueue.Supplier.get()
make sure you have read and understood these before using this method.- Returns:
- the number of offered elements
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