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Glassfish example source code file (Queue.java)
The Glassfish Queue.java source code/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. * * * This file incorporates work covered by the following copyright and * permission notice: * * Copyright 2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.catalina.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(); } } Other Glassfish examples (source code examples)Here is a short list of links related to this Glassfish Queue.java source code file: |
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