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From a..@locus.apache.org
Subject cvs commit: jakarta-tomcat/src/share/org/apache/tomcat/util Queue.java
Date Sun, 13 Feb 2000 06:23:32 GMT
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();
      }
  }
  
  
  

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