You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@tomcat.apache.org by ak...@locus.apache.org on 2000/02/13 07:23:32 UTC
cvs commit: jakarta-tomcat/src/share/org/apache/tomcat/util Queue.java
akv 00/02/12 22:23:32
Added: src/share/org/apache/tomcat/util Queue.java
Log:
Hmmm. I thought I just added this.
Revision Changes Path
1.1 jakarta-tomcat/src/share/org/apache/tomcat/util/Queue.java
Index: Queue.java
===================================================================
/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.tomcat.util;
import java.util.Vector;
/**
* 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)
*/
public class Queue {
private Vector vector = new Vector();
/**
* Put the object into the queue.
*
* @param object the object to be appended to the
* queue.
*/
public synchronized void put(Object object) {
vector.addElement(object);
notify();
}
/**
* Pull the first object out of the queue. Wait if the queue is
* empty.
*/
public synchronized Object pull() {
while (isEmpty())
try {
wait();
} catch (InterruptedException ex) {
}
return get();
}
/**
* Get the first object out of the queue. Return null if the queue
* is empty.
*/
public synchronized Object get() {
Object object = peek();
if (object != null)
vector.removeElementAt(0);
return object;
}
/**
* Peek to see if something is available.
*/
public Object peek() {
if (isEmpty())
return null;
return vector.elementAt(0);
}
/**
* Is the queue empty?
*/
public boolean isEmpty() {
return vector.isEmpty();
}
/**
* How many elements are there in this queue?
*/
public int size() {
return vector.size();
}
}