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Blocking Queue as Synchronizer

Posted on 2013-02-03
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hi

<<A Synchronizer is a object  that coordinates the control flow of threads based on its state,
Blocking queue can act as Synchornizer.>>--
 concurrency in practice- brian goetz page 94

Can anyone explain is simple terms with a simple example what this means?

Thanks
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Question by:royjayd
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krakatoa earned 213 total points
ID: 38850581
Read this.
(If you want to).
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by:Valeri
Valeri earned 212 total points
ID: 38850772
"A blocking queue is a queue that blocks when you try to dequeue from it and the queue is empty, or if you try to enqueue items to it and the queue is already full."
Because of that "queue" and "dequeue" operations need to be synchronized, because many threads are trying to "queue" and "dequeue" in one and the same time.
That's way "queue" and "dequeue" methods are synchronized, so it means that "this" (which is the BlockingQueue) is used as synchornizer. So in this case the blocking queue work's as synchornizer to it's self.
Btw in java 1.5 implementations of BlockingQueue (for example ArrayBlockingQueue) don't use the object itself for the synchronization. But the meaning in the book is that "queue" and "dequeue" methods could be synchronised by the BlockingQueue.

public synchronized void enqueue(Object item) {
}

public synchronized Object dequeue() {
}

both of this methods are synchronised on "this" object, which is the instance of the BlockingQueue.
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