org.jboss.netty.util.internal
类 LinkedTransferQueue<E>

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractQueue<E>
          org.jboss.netty.util.internal.LinkedTransferQueue<E>

类型参数：

E - the type of elements held in this collection

所有已实现的接口：

java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, java.util.concurrent.BlockingQueue<E>, java.util.Queue<E>

public class LinkedTransferQueue<E>
extends java.util.AbstractQueue<E>
implements java.util.concurrent.BlockingQueue<E>, java.io.Serializable

An unbounded BlockingQueue based on linked nodes. This queue orders elements FIFO (first-in-first-out) with respect to any given producer. The head of the queue is that element that has been on the queue the longest time for some producer. The tail of the queue is that element that has been on the queue the shortest time for some producer.

Beware that, unlike in most collections, the size method is NOT a constant-time operation. Because of the asynchronous nature of these queues, determining the current number of elements requires a traversal of the elements.

This class and its iterator implement all of the optional methods of the Collection and Iterator interfaces.

Memory consistency effects: As with other concurrent collections, actions in a thread prior to placing an object into a LinkedTransferQueue happen-before actions subsequent to the access or removal of that element from the LinkedTransferQueue in another thread.

This class is a member of the Java Collections Framework.

另请参见：

序列化表格

构造方法摘要

LinkedTransferQueue()
Creates an initially empty LinkedTransferQueue.

LinkedTransferQueue(java.util.Collection<? extends E> c)
Creates a LinkedTransferQueue initially containing the elements of the given collection, added in traversal order of the collection's iterator.

方法摘要

boolean	add(E e) Inserts the specified element at the tail of this queue.
int	drainTo(java.util.Collection<? super E> c)
int	drainTo(java.util.Collection<? super E> c, int maxElements)
int	getWaitingConsumerCount()
boolean	hasWaitingConsumer()
boolean	isEmpty() Returns true if this queue contains no elements.
java.util.Iterator<E>	iterator() Returns an iterator over the elements in this queue in proper sequence, from head to tail.
boolean	offer(E e) Inserts the specified element at the tail of this queue.
boolean	offer(E e, long timeout, java.util.concurrent.TimeUnit unit) Inserts the specified element at the tail of this queue.
E	peek()
E	poll()
E	poll(long timeout, java.util.concurrent.TimeUnit unit)
void	put(E e) Inserts the specified element at the tail of this queue.
int	remainingCapacity() Always returns Integer.MAX_VALUE because a LinkedTransferQueue is not capacity constrained.
boolean	remove(java.lang.Object o) Removes a single instance of the specified element from this queue, if it is present.
int	size() Returns the number of elements in this queue.
E	take()
void	transfer(E e) Transfers the element to a consumer, waiting if necessary to do so.
boolean	tryTransfer(E e) Transfers the element to a waiting consumer immediately, if possible.
boolean	tryTransfer(E e, long timeout, java.util.concurrent.TimeUnit unit) Transfers the element to a consumer if it is possible to do so before the timeout elapses.

从类 java.util.AbstractQueue 继承的方法

addAll, clear, element, remove

从类 java.util.AbstractCollection 继承的方法

contains, containsAll, removeAll, retainAll, toArray, toArray, toString

从类 java.lang.Object 继承的方法

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

从接口 java.util.concurrent.BlockingQueue 继承的方法

contains

从接口 java.util.Queue 继承的方法

element, remove

从接口 java.util.Collection 继承的方法

addAll, clear, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray

构造方法详细信息

LinkedTransferQueue

public LinkedTransferQueue()

Creates an initially empty LinkedTransferQueue.

LinkedTransferQueue

public LinkedTransferQueue(java.util.Collection<? extends E> c)

Creates a LinkedTransferQueue initially containing the elements of the given collection, added in traversal order of the collection's iterator.

参数：

c - the collection of elements to initially contain

抛出：

java.lang.NullPointerException - if the specified collection or any of its elements are null

方法详细信息

put

public void put(E e)

Inserts the specified element at the tail of this queue. As the queue is unbounded, this method will never block.

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 put

抛出：

java.lang.NullPointerException - if the specified element is null

offer

public boolean offer(E e,
                     long timeout,
                     java.util.concurrent.TimeUnit unit)

Inserts the specified element at the tail of this queue. As the queue is unbounded, this method will never block or return false.

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 offer

返回：

true (as specified by BlockingQueue.offer)

抛出：

java.lang.NullPointerException - if the specified element is null

offer

public boolean offer(E e)

Inserts the specified element at the tail of this queue. As the queue is unbounded, this method will never return false.

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 offer

指定者：

接口 java.util.Queue<E> 中的 offer

返回：

true (as specified by BlockingQueue.offer)

抛出：

java.lang.NullPointerException - if the specified element is null

add

public boolean add(E e)

Inserts the specified element at the tail of this queue. As the queue is unbounded, this method will never throw IllegalStateException or return false.

指定者：

接口 java.util.Collection<E> 中的 add

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 add

指定者：

接口 java.util.Queue<E> 中的 add

覆盖：

类 java.util.AbstractQueue<E> 中的 add

返回：

true (as specified by Collection.add(E))

抛出：

java.lang.NullPointerException - if the specified element is null

tryTransfer

public boolean tryTransfer(E e)

Transfers the element to a waiting consumer immediately, if possible.

More precisely, transfers the specified element immediately if there exists a consumer already waiting to receive it (in take() or timed poll), otherwise returning false without enqueuing the element.

抛出：

java.lang.NullPointerException - if the specified element is null

transfer

public void transfer(E e)
              throws java.lang.InterruptedException

Transfers the element to a consumer, waiting if necessary to do so.

More precisely, transfers the specified element immediately if there exists a consumer already waiting to receive it (in take() or timed poll), else inserts the specified element at the tail of this queue and waits until the element is received by a consumer.

抛出：

java.lang.NullPointerException - if the specified element is null

java.lang.InterruptedException

tryTransfer

public boolean tryTransfer(E e,
                           long timeout,
                           java.util.concurrent.TimeUnit unit)
                    throws java.lang.InterruptedException

Transfers the element to a consumer if it is possible to do so before the timeout elapses.

More precisely, transfers the specified element immediately if there exists a consumer already waiting to receive it (in take() or timed poll), else inserts the specified element at the tail of this queue and waits until the element is received by a consumer, returning false if the specified wait time elapses before the element can be transferred.

抛出：

java.lang.NullPointerException - if the specified element is null

java.lang.InterruptedException

take

public E take()
       throws java.lang.InterruptedException

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 take

抛出：

java.lang.InterruptedException

poll

public E poll(long timeout,
              java.util.concurrent.TimeUnit unit)
       throws java.lang.InterruptedException

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 poll

抛出：

java.lang.InterruptedException

poll

public E poll()

指定者：

接口 java.util.Queue<E> 中的 poll

drainTo

public int drainTo(java.util.Collection<? super E> c)

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 drainTo

抛出：

java.lang.NullPointerException

java.lang.IllegalArgumentException

drainTo

public int drainTo(java.util.Collection<? super E> c,
                   int maxElements)

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 drainTo

抛出：

java.lang.NullPointerException

java.lang.IllegalArgumentException

iterator

public java.util.Iterator<E> iterator()

Returns an iterator over the elements in this queue in proper sequence, from head to tail.

The returned iterator is a "weakly consistent" iterator that will never throw ConcurrentModificationException, and guarantees to traverse elements as they existed upon construction of the iterator, and may (but is not guaranteed to) reflect any modifications subsequent to construction.

指定者：

接口 java.lang.Iterable<E> 中的 iterator

指定者：

接口 java.util.Collection<E> 中的 iterator

指定者：

类 java.util.AbstractCollection<E> 中的 iterator

返回：

an iterator over the elements in this queue in proper sequence

peek

public E peek()

指定者：

接口 java.util.Queue<E> 中的 peek

isEmpty

public boolean isEmpty()

Returns true if this queue contains no elements.

指定者：

接口 java.util.Collection<E> 中的 isEmpty

覆盖：

类 java.util.AbstractCollection<E> 中的 isEmpty

返回：

true if this queue contains no elements

hasWaitingConsumer

public boolean hasWaitingConsumer()

size

public int size()

Returns the number of elements in this queue. If this queue contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Beware that, unlike in most collections, this method is NOT a constant-time operation. Because of the asynchronous nature of these queues, determining the current number of elements requires an O(n) traversal.

指定者：

接口 java.util.Collection<E> 中的 size

指定者：

类 java.util.AbstractCollection<E> 中的 size

返回：

the number of elements in this queue

getWaitingConsumerCount

public int getWaitingConsumerCount()

remove

public boolean remove(java.lang.Object o)

Removes a single instance of the specified element from this queue, if it is present. More formally, removes an element e such that o.equals(e), if this queue contains one or more such elements. Returns true if this queue contained the specified element (or equivalently, if this queue changed as a result of the call).

指定者：

接口 java.util.Collection<E> 中的 remove

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 remove

覆盖：

类 java.util.AbstractCollection<E> 中的 remove

参数：

o - element to be removed from this queue, if present

返回：

true if this queue changed as a result of the call

remainingCapacity

public int remainingCapacity()

Always returns Integer.MAX_VALUE because a LinkedTransferQueue is not capacity constrained.

指定者：

接口 java.util.concurrent.BlockingQueue<E> 中的 remainingCapacity

返回：

Integer.MAX_VALUE (as specified by BlockingQueue.remainingCapacity())