com.hazelcast.core

Interface IQueue<E>

Type Parameters:

E - queue item type

All Superinterfaces:

BaseQueue<E>, BlockingQueue<E>, Collection<E>, DistributedObject, ICollection<E>, Iterable<E>, Queue<E>

All Known Implementing Classes:

ClientQueueProxy, QueueProxyImpl

public interface IQueue<E>
extends BlockingQueue<E>, BaseQueue<E>, ICollection<E>

Concurrent, blocking, distributed, observable queue.

The IQueue is not a partitioned data-structure. All the content of an IQueue is stored in a single machine (and in the backup). The IQueue will not scale by adding more members to the cluster.

See Also:

BaseQueue, Queue, BlockingQueue, TransactionalQueue

Method Summary

Modifier and Type	Method and Description
LocalQueueStats	getLocalQueueStats() Returns LocalQueueStats for this queue.
E	poll() Retrieves and removes the head of this queue, or returns null if this queue is empty.
E	poll(long timeout, TimeUnit unit) Retrieves and removes the head of this queue, waiting up to the specified wait time if necessary for an element to become available.
E	take() Retrieves and removes the head of this queue, waiting if necessary until an element becomes available.

Methods inherited from interface java.util.concurrent.BlockingQueue

add, contains, drainTo, drainTo, offer, offer, put, remainingCapacity, remove

Methods inherited from interface java.util.Queue

element, peek, remove

Methods inherited from interface java.util.Collection

addAll, clear, containsAll, equals, hashCode, isEmpty, iterator, parallelStream, removeAll, removeIf, retainAll, size, spliterator, stream, toArray, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface com.hazelcast.core.BaseQueue

offer, offer, size

Methods inherited from interface com.hazelcast.core.ICollection

addItemListener, getName, removeItemListener

Methods inherited from interface com.hazelcast.core.DistributedObject

destroy, getPartitionKey, getServiceName

Method Detail

poll

E poll()

Retrieves and removes the head of this queue, or returns null if this queue is empty.

Specified by:

poll in interface BaseQueue<E>

Specified by:

poll in interface Queue<E>

Returns:

the head of this queue, or null if this queue is empty

poll

E poll(long timeout,
       TimeUnit unit)
throws InterruptedException

Retrieves and removes the head of this queue, waiting up to the specified wait time if necessary for an element to become available.

Specified by:

poll in interface BaseQueue<E>

Specified by:

poll in interface BlockingQueue<E>

Parameters:

timeout - how long to wait before giving up, in units of unit

unit - a TimeUnit determining how to interpret the timeout parameter

Returns:

the head of this queue, or null if the specified waiting time elapses before an element is available

Throws:

InterruptedException - if interrupted while waiting

take

E take()
throws InterruptedException

Retrieves and removes the head of this queue, waiting if necessary until an element becomes available.

Specified by:

take in interface BaseQueue<E>

Specified by:

take in interface BlockingQueue<E>

Returns:

the head of this queue

Throws:

InterruptedException - if interrupted while waiting

getLocalQueueStats

LocalQueueStats getLocalQueueStats()

Returns LocalQueueStats for this queue. LocalQueueStats is the statistics for the local portion of this queue.

Returns:

this queue's local statistics.