Package com.db4o.foundation

Class PausableBlockingQueue<T>

java.lang.Object

com.db4o.foundation.BlockingQueue<T>

com.db4o.foundation.PausableBlockingQueue<T>

All Implemented Interfaces:

BlockingQueue4<T>, PausableBlockingQueue4<T>, Queue4<T>

Direct Known Subclasses:

TimeoutBlockingQueue

public class PausableBlockingQueue<T>
extends BlockingQueue<T>
implements PausableBlockingQueue4<T>

Field Summary

Fields inherited from class com.db4o.foundation.BlockingQueue

_lock, _queue, _stopped

Constructor Summary

Constructors

Constructor	Description
PausableBlockingQueue()

Method Summary

Modifier and Type	Method	Description
boolean	isPaused()
boolean	pause()	Pauses the queue, making calls to Queue4.next() block until PausableBlockingQueue4.resume() is called.
boolean	resume()	Resumes the queue, releasing blocked calls to Queue4.next() that can reach a next queue item..
T	tryNext()	Returns the next element in queue if there is one available, returns null otherwise.
protected boolean	unsafeWaitForNext(long timeout)

Methods inherited from class com.db4o.foundation.BlockingQueue

add, drainTo, hasNext, iterator, next, next, nextMatching, stop, unsafeWaitForNext, waitForNext, waitForNext

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.db4o.foundation.BlockingQueue4

drainTo, next, stop

Methods inherited from interface com.db4o.foundation.Queue4

add, hasNext, iterator, next, nextMatching

Constructor Detail

PausableBlockingQueue

public PausableBlockingQueue()

Method Detail

pause

public boolean pause()

Description copied from interface: PausableBlockingQueue4

Pauses the queue, making calls to Queue4.next() block until PausableBlockingQueue4.resume() is called.

Specified by:

pause in interface PausableBlockingQueue4<T>

Returns:

whether or not this call changed the state of the queue.

resume

public boolean resume()

Description copied from interface: PausableBlockingQueue4

Resumes the queue, releasing blocked calls to Queue4.next() that can reach a next queue item..

Specified by:

resume in interface PausableBlockingQueue4<T>

Returns:

whether or not this call changed the state of the queue.

isPaused

public boolean isPaused()

Specified by:

isPaused in interface PausableBlockingQueue4<T>

unsafeWaitForNext

protected boolean unsafeWaitForNext(long timeout)
                             throws BlockingQueueStoppedException

Overrides:

unsafeWaitForNext in class BlockingQueue<T>

Throws:

BlockingQueueStoppedException

tryNext

public T tryNext()

Description copied from interface: PausableBlockingQueue4

Returns the next element in queue if there is one available, returns null otherwise.

This method will not never block, regardless of the queue being paused or no elements are available.

Specified by:

tryNext in interface PausableBlockingQueue4<T>

Returns:

next element, if available and queue not paused.