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Queue.javaAPI DocGlassfish v2 API3592Fri May 04 22:32:30 BST 2007org.apache.catalina.util

Queue

public class Queue extends Object
A simple FIFO queue class which causes the calling thread to wait if the queue is empty and notifies threads that are waiting when it is not empty.
author
Anil V (akv@eng.sun.com)

Fields Summary
private Vector
vector
Constructors Summary
Methods Summary
public synchronized java.lang.Objectget()
Get the first object out of the queue. Return null if the queue is empty.

        Object object = peek();
        if (object != null)
            vector.removeElementAt(0);
        return object;
public booleanisEmpty()
Is the queue empty?

        return vector.isEmpty();
public java.lang.Objectpeek()
Peek to see if something is available.

        if (isEmpty())
            return null;
        return vector.elementAt(0);
public synchronized java.lang.Objectpull()
Pull the first object out of the queue. Wait if the queue is empty.

        while (isEmpty())
            try {
                wait();
            } catch (InterruptedException ex) {
            }
        return get();
public synchronized voidput(java.lang.Object object)
Put the object into the queue.

param
object the object to be appended to the queue.


                                                             
         
        vector.addElement(object);
        notify();
public intsize()
How many elements are there in this queue?

        return vector.size();