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

*** 1,7 ****
  /*
!  * 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
--- 1,7 ----
  /*
!  * 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
*** 28,39 ****
  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>
--- 28,41 ----
  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.
   *
   * <p>
*** 48,58 ****
   * @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>
--- 50,60 ----
   * @author Kohsuke Kawaguchi
   */
  public abstract class Pool<T> {
  
      // volatile since multiple threads may access queue reference
!     private volatile SoftReference<ConcurrentLinkedQueue<T>> queue;
  
      /**
       * Gets a new object from the pool.
       *
       * <p>
*** 67,86 ****
              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;
      }
  
      /**
--- 69,88 ----
              return create();
          return t;
      }
  
      private ConcurrentLinkedQueue<T> getQueue() {
!         SoftReference<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 SoftReference<ConcurrentLinkedQueue<T>>(d);
  
          return d;
      }
  
      /**