waba.applet
Class Queue

java.lang.Object
  |
  +--waba.applet.Queue

public class Queue

extends java.lang.Object

Implements a simple FIFO queue of unlimited size. This queue is thread safe, including functionality that allows one thread to wait for another to push an object onto the queue.

Constructor Summary

Queue()

Method Summary

int	getSize()
java.lang.Object	pop() Returns the oldest object in the queue.
java.lang.Object	popWait() Returns the oldest object in the queue.
java.lang.Object	popWait(int maxTime) Returns the oldest object in the queue.
void	push(java.lang.Object o) Push an object on the queue and notify any waiting threads.

Methods inherited from class java.lang.Object

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

Constructor Detail

Queue

public Queue()

Method Detail

push

public void push(java.lang.Object o)

Push an object on the queue and notify any waiting threads.

Parameters:

o - object to push onto the queue

pop

public java.lang.Object pop()

Returns the oldest object in the queue.

Returns:

oldest object in the queue or null if no objects in the queue

See Also:

popWait(), popWait(int)

popWait

public java.lang.Object popWait()

Returns the oldest object in the queue. If the queue is empty, then this method will block until another thread pushes an object onto the queue.

Returns:

oldest object in the queue

See Also:

pop(), popWait(int)

popWait

public java.lang.Object popWait(int maxTime)

Returns the oldest object in the queue. If there are no object in the queue, then this method will block until an object is placed in the queue from another thread, or the specified time expires. If the time expires and no object has been placed in the queue, this method will return null.

Parameters:

maxTime - maximum amount of time, in ms, to wait for an object to placed in the queue

Returns:

oldest object in the queue, or null if the specified time expires and no objects have been placed in queue.

See Also:

pop(), popWait()

getSize

public int getSize()