jurt/test/com/sun/star/uno/WeakReference_Test.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19 package com.sun.star.uno;
  20
  21 import java.util.ArrayList;
  22 import java.util.Iterator;
  23 import org.junit.Test;
  24 import util.WaitUnreachable;
  25 import static org.junit.Assert.*;
  26
  27 public final class WeakReference_Test {
  28     @Test public void test() {
  29         Object o = new MockWeak();
  30         WeakReference r1 = new WeakReference(o);
  31         WeakReference r2 = new WeakReference(r1);
  32         assertSame(o, r1.get());
  33         assertSame(o, r2.get());
  34         WaitUnreachable u = new WaitUnreachable(o);
  35         o = null;
  36         u.waitUnreachable();
  37         assertNull("a3", r1.get());
  38         assertNull("a4", r2.get());
  39     }
  40
  41     private static final class MockWeak implements XWeak {
  42         public XAdapter queryAdapter() {
  43             return adapter;
  44         }
  45
  46         @Override
  47         protected void finalize() throws Throwable {
  48             adapter.dispose();
  49             super.finalize();
  50         }
  51
  52         private static final class Adapter implements XAdapter {
  53             public Adapter(Object obj) {
  54                 ref = new java.lang.ref.WeakReference<Object>(obj);
  55             }
  56
  57             public Object queryAdapted() {
  58                 return ref.get();
  59             }
  60
  61             public void addReference(XReference ref) {
  62                 synchronized (this) {
  63                     if (listeners != null) {
  64                         listeners.add(ref);
  65                         return;
  66                     }
  67                 }
  68                 ref.dispose();
  69             }
  70
  71             public synchronized void removeReference(XReference ref) {
  72                 if (listeners != null) {
  73                     listeners.remove(ref);
  74                 }
  75             }
  76
  77             public void dispose() {
  78                 ArrayList<XReference> l;
  79                 synchronized (this){
  80                     l = listeners;
  81                     listeners = null;
  82                 }
  83                 if (l != null) {
  84                     java.lang.RuntimeException ex = null;
  85                     for (Iterator<XReference> i = l.iterator(); i.hasNext();) {
  86                         try {
  87                             i.next().dispose();
  88                         } catch (java.lang.RuntimeException e) {
  89                             ex = e;
  90                         }
  91                     }
  92                     if (ex != null) {
  93                         throw ex;
  94                     }
  95                 }
  96             }
  97
  98             private final java.lang.ref.WeakReference<Object> ref;
  99             private ArrayList<XReference> listeners = new ArrayList<XReference>();
 100         }
 101
 102         private final Adapter adapter = new Adapter(this);
 103     }
 104 }