jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/ws/util/Pool.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/ws/util/Pool.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/ws/util/Pool.java

Thu, 31 Aug 2017 15:18:52 +0800

author: aoqi
date: Thu, 31 Aug 2017 15:18:52 +0800
changeset 637: 9c07ef4934dd
parent 368: 0989ad8c0860
parent 0: 373ffda63c9a
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 1997, 2013, 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.WeakReference;
 /**
  * General-purpose object pool.
  *
  * <p>
  * 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.)
  *
  * <p>
  * This class provides a default implementation of such a pool.
  *
  * TODO: improve the implementation
  *
  * @author Kohsuke Kawaguchi
  */
 public abstract class Pool<T> {
     // volatile since multiple threads may access queue reference
     private volatile WeakReference<ConcurrentLinkedQueue<T>> queue;
     /**
      * Gets a new object from the pool.
      *
      * <p>
      * 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<T> getQueue() {
         WeakReference<ConcurrentLinkedQueue<T>> q = queue;
         if (q != null) {
             ConcurrentLinkedQueue<T> d = q.get();
             if (d != null)
                 return d;
         }
         // overwrite the queue
         ConcurrentLinkedQueue<T> d = new ConcurrentLinkedQueue<T>();
         queue = new WeakReference<ConcurrentLinkedQueue<T>>(d);
         return d;
     }
     /**
      * Returns an object back to the pool.
      */
     public final void recycle(T t) {
         getQueue().offer(t);
     }
     /**
      * Creates a new instance of object.
      *
      * <p>
      * This method is used when someone wants to
      * {@link #take() take} an object from an empty pool.
      *
      * <p>
      * 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<javax.xml.bind.Marshaller> {
         private final JAXBContext context;
         public Marshaller(JAXBContext context) {
             this.context = context;
         }
         @Override
         protected javax.xml.bind.Marshaller create() {
             try {
                 return context.createMarshaller();
             } catch (JAXBException e) {
                 // impossible
                 throw new AssertionError(e);
             }
         }
     }
     /**
      * JAXB {@link javax.xml.bind.Marshaller} pool.
      */
     public static final class Unmarshaller extends Pool<javax.xml.bind.Unmarshaller> {
         private final JAXBContext context;
         public Unmarshaller(JAXBContext context) {
             this.context = context;
         }
         @Override
         protected javax.xml.bind.Unmarshaller create() {
             try {
                 return context.createUnmarshaller();
             } catch (JAXBException e) {
                 // impossible
                 throw new AssertionError(e);
             }
         }
     }
     /**
      * {@link Tube} pool.
      */
     public static final class TubePool extends Pool<Tube> {
         private final Tube master;
         public TubePool(Tube master) {
             this.master = master;
             recycle(master);    // we'll use master as a part of the pool, too.
         }
         @Override
         protected Tube create() {
             return TubeCloner.clone(master);
         }
         /**
          *
          * @return master tubeline from pool
          * @deprecated Expected to be used in rare cases where access to master
          * tubeline is required and safe, such as Stub.close()."
          */
         @Deprecated()
         public final Tube takeMaster() {
             return master;
         }
     }
 }

Mercurial > jdk8-mips64-public > jaxws / annotate

src/share/jaxws_classes/com/sun/xml/internal/ws/util/Pool.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/ws/util/Pool.java