/* * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.xml.internal.ws.util; import com.sun.xml.internal.ws.api.pipe.Tube; import com.sun.xml.internal.ws.api.pipe.TubeCloner; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import java.util.concurrent.ConcurrentLinkedQueue; import java.lang.ref.SoftReference; /** * General-purpose object pool. * *
* In many parts of the runtime, we need to pool instances of objects that * are expensive to create (such as JAXB objects, StAX parsers, {@link Tube} instances.) * *
* This class provides a default implementation of such a pool.
*
* TODO: improve the implementation
*
* @author Kohsuke Kawaguchi
*/
public abstract class Pool
* If no object is available in the pool, this method creates a new one.
*
* @return
* always non-null.
*/
public final T take() {
T t = getQueue().poll();
if(t==null)
return create();
return t;
}
private ConcurrentLinkedQueue
* This method is used when someone wants to
* {@link #take() take} an object from an empty pool.
*
*
* Also note that multiple threads may call this method
* concurrently.
*/
protected abstract T create();
/**
* JAXB {@link javax.xml.bind.Marshaller} pool.
*/
public static final class Marshaller extends Pool