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Glassfish example source code file (RWLock.java)
The Glassfish RWLock.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. */ package com.sun.jts.CosTransactions; import java.lang.InterruptedException; import java.util.LinkedList; import java.util.logging.Logger; import java.util.logging.Level; import com.sun.logging.LogDomains; /** * A <i>RWLock provides concurrency control for multiple readers single writer * access patterns. This lock can provide access to multiple reader threads simultaneously * as long as there are no writer threads. Once a writer thread gains access to the * instance locked by a RWLock, all the reader threads wait till the writer completes * accessing the instance in question. * <p> * A RWLock is extremely useful in scenarios where there are lots more readers and * very few writers to a data structure. Also if the read operation by the reader * thread could take significant amount of time (binary search etc.) * <p> * The usage of Lock can be see as under: * <p>* public class MyBTree { * private RWLock lock = new Lock(); * ..... * ..... * public Object find(Object o) { * try { * lock.acquireReadLock(); * ....perform complex search to get the Object ... * return result; * } finally { * lock.releaseReadLock(); * } * } * * public void insert(Object o) { * try { * lock.acquireWriteLock(); * ....perform complex operation to insert object ... * } finally { * lock.releaseWriteLock(); * } * } * } * </pre> Other Glassfish examples (source code examples)Here is a short list of links related to this Glassfish RWLock.java source code file: |
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