Package ej.bon

Class ReferenceQueue<T>

java.lang.Object

ej.bon.ReferenceQueue<T>

Type Parameters:

T - the type of enqueued objects

public final class ReferenceQueue<T>
extends Object

ReferenceQueue represents a queue of EnqueuedWeakReference. The system is responsible for adding such EnqueuedWeakReference into the ReferenceQueue.

There are two ways to retrieve and remove an element from the queue.

• poll() : returns null if the queue is empty, otherwise returns and removes the first element of the FIFO queue.
• remove() : blocks the current thread until the queue becomes not empty. returns and removes the first element of the FIFO queue.

See Also:

EnqueuedWeakReference

Constructor Summary

Constructors

Constructor	Description
ReferenceQueue()	Creates an empty Reference queue.

Method Summary

Modifier and Type	Method	Description
EnqueuedWeakReference<T>	poll()	Queries the queue and returns and removes the first element of the queue.
EnqueuedWeakReference<T>	remove()	Queries the queue, returns and removes the first element of the queue.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReferenceQueue

public ReferenceQueue()

Creates an empty Reference queue.

Method Detail

poll

@Nullable
public EnqueuedWeakReference<T> poll()

Queries the queue and returns and removes the first element of the queue. If the queue is empty, returns null.

Returns:

EnqueuedWeakReference or null

remove

public EnqueuedWeakReference<T> remove()
                                throws InterruptedException

Queries the queue, returns and removes the first element of the queue. If the queue is empty, blocks the current thread until the queue gets at least one element (automatically added by the system).

Returns:

EnqueuedWeakReference

Throws:

InterruptedException - if the thread is interrupted