< prev index next >

test/java/lang/ref/ReferenceEnqueue.java

Print this page


   1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /* @test
  25  * @bug 4268317 8132306
  26  * @summary Test if Reference.enqueue() works properly with GC



  27  */
  28 
  29 import java.lang.ref.*;


  30 
  31 public class ReferenceEnqueue {
  32 
  33     public static void main(String args[]) throws Exception {
  34         for (int i=0; i < 5; i++)
  35             new WeakRef().run();


  36         System.out.println("Test passed.");
  37     }
  38 
  39     static class WeakRef {
  40         final ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
  41         final Reference<Object> ref;
  42         final int iterations = 1000;
  43 
  44         WeakRef() {
  45             this.ref = new WeakReference<Object>(new Object(), queue);
  46         }
  47 
  48         void run() throws InterruptedException {
  49             System.gc();
  50             for (int i = 0; i < iterations; i++) {
  51                 System.gc();
  52                 if (ref.isEnqueued()) {
  53                     break;
  54                 }
  55 


  59             if (ref.isEnqueued() == false) {
  60                 // GC have not enqueued refWeak for the timeout period
  61                 System.out.println("Reference not enqueued yet");
  62                 return;
  63             }
  64 
  65             if (ref.enqueue() == true) {
  66                 // enqueue() should return false since
  67                 // ref is already enqueued by the GC
  68                 throw new RuntimeException("Error: enqueue() returned true;"
  69                         + " expected false");
  70             }
  71 
  72             if (queue.poll() == null) {
  73                 // poll() should return ref enqueued by the GC
  74                 throw new RuntimeException("Error: poll() returned null;"
  75                         + " expected ref object");
  76             }
  77         }
  78     }














































  79 }
   1 /*
   2  * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /* @test
  25  * @bug 4268317 8132306 8175797
  26  * @summary Test if Reference.enqueue() works properly with GC
  27  * @run main ReferenceEnqueue
  28  * @run main/othervm -Djdk.ref.disableClearAndEnqueue=true ReferenceEnqueue
  29  * @run main/othervm -Djava.security.manager ReferenceEnqueue
  30  */
  31 
  32 import java.lang.ref.*;
  33 import java.util.ArrayList;
  34 import java.util.List;
  35 
  36 public class ReferenceEnqueue {
  37 
  38     public static void main(String args[]) throws Exception {
  39         for (int i=0; i < 5; i++) {
  40             new WeakRef().run();
  41             new ExplicitEnqueue().run();
  42         }
  43         System.out.println("Test passed.");
  44     }
  45 
  46     static class WeakRef {
  47         final ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
  48         final Reference<Object> ref;
  49         final int iterations = 1000;
  50 
  51         WeakRef() {
  52             this.ref = new WeakReference<Object>(new Object(), queue);
  53         }
  54 
  55         void run() throws InterruptedException {
  56             System.gc();
  57             for (int i = 0; i < iterations; i++) {
  58                 System.gc();
  59                 if (ref.isEnqueued()) {
  60                     break;
  61                 }
  62 


  66             if (ref.isEnqueued() == false) {
  67                 // GC have not enqueued refWeak for the timeout period
  68                 System.out.println("Reference not enqueued yet");
  69                 return;
  70             }
  71 
  72             if (ref.enqueue() == true) {
  73                 // enqueue() should return false since
  74                 // ref is already enqueued by the GC
  75                 throw new RuntimeException("Error: enqueue() returned true;"
  76                         + " expected false");
  77             }
  78 
  79             if (queue.poll() == null) {
  80                 // poll() should return ref enqueued by the GC
  81                 throw new RuntimeException("Error: poll() returned null;"
  82                         + " expected ref object");
  83             }
  84         }
  85     }
  86 
  87     static class ExplicitEnqueue {
  88         final ReferenceQueue<Object> queue = new ReferenceQueue<>();
  89         final List<Reference<Object>> refs = new ArrayList<>();
  90         final int iterations = 1000;
  91         final boolean disableClearAndEnqueue =
  92             Boolean.parseBoolean("jdk.ref.disableClearAndEnqueue");
  93 
  94         ExplicitEnqueue() {
  95             this.refs.add(new SoftReference<>(new Object(), queue));
  96             this.refs.add(new WeakReference<>(new Object(), queue));
  97             this.refs.add(new PhantomReference<>(new Object(), queue));
  98         }
  99 
 100         void run() throws InterruptedException {
 101             for (Reference<Object> ref : refs) {
 102                 if (ref.enqueue() == false) {
 103                     throw new RuntimeException("Error: enqueue failed");
 104                 }
 105                 if (disableClearAndEnqueue && ref.get() == null) {
 106                     throw new RuntimeException("Error: clearing should be disabled");
 107                 }
 108                 if (!disableClearAndEnqueue && ref.get() != null) {
 109                     throw new RuntimeException("Error: referent must be cleared");
 110                 }
 111             }
 112 
 113             System.gc();
 114             for (int i = 0; refs.size() > 0 && i < iterations; i++) {
 115                 Reference<Object> ref = (Reference<Object>)queue.poll();
 116                 if (ref == null) {
 117                     System.gc();
 118                     Thread.sleep(100);
 119                     continue;
 120                 }
 121 
 122                 if (refs.remove(ref) == false) {
 123                     throw new RuntimeException("Error: unknown reference " + ref);
 124                 }
 125             }
 126 
 127             if (!refs.isEmpty()) {
 128                 throw new RuntimeException("Error: not all references are removed");
 129             }
 130         }
 131     }
 132 }
< prev index next >