1 /*
   2  * Copyright (c) 2015, 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 import org.testng.annotations.Test;
  25 import org.testng.Assert;
  26 
  27 import java.util.concurrent.TimeUnit;
  28 import java.util.concurrent.locks.Condition;
  29 import java.util.concurrent.locks.ReentrantLock;
  30 
  31 import com.oracle.java.testlibrary.dcmd.CommandExecutor;
  32 import com.oracle.java.testlibrary.dcmd.JMXExecutor;
  33 
  34 /*
  35  * @test
  36  * @summary Test of diagnostic command GC.run_finalization
  37  * @library /testlibrary
  38  * @modules java.base/sun.misc
  39  *          java.compiler
  40  *          java.management
  41  *          jdk.jvmstat/sun.jvmstat.monitor
  42  * @build com.oracle.java.testlibrary.*
  43  * @build com.oracle.java.testlibrary.dcmd.*
  44  * @run testng RunFinalizationTest
  45  */
  46 public class RunFinalizationTest {
  47     static ReentrantLock lock = new ReentrantLock();
  48     static Condition cond = lock.newCondition();
  49     static volatile boolean wasFinalized = false;
  50     static volatile boolean wasInitialized = false;
  51 
  52     class MyObject {
  53         public MyObject() {
  54             /* Make sure object allocation/deallocation is not optimized out */
  55             wasInitialized = true;
  56         }
  57 
  58         protected void finalize() {
  59             lock.lock();
  60             wasFinalized = true;
  61             cond.signalAll();
  62             lock.unlock();
  63         }
  64     }
  65 
  66     public static MyObject o;
  67 
  68     public void run(CommandExecutor executor) {
  69         lock.lock();
  70         o = new MyObject();
  71         o = null;
  72         System.gc();
  73         executor.execute("GC.run_finalization");
  74 
  75         int waited = 0;
  76         int waitTime = 15;
  77 
  78         try {
  79             System.out.println("Waiting for signal from finalizer");
  80 
  81             while (!cond.await(waitTime, TimeUnit.SECONDS)) {
  82                 waited += waitTime;
  83                 System.out.println(String.format("Waited %d seconds", waited));
  84             }
  85 
  86             System.out.println("Received signal");
  87         } catch (InterruptedException e) {
  88             Assert.fail("Test error: Interrupted while waiting for signal from finalizer", e);
  89         } finally {
  90             lock.unlock();
  91         }
  92 
  93         if (!wasFinalized) {
  94             Assert.fail("Test failure: Object was not finalized");
  95         }
  96     }
  97 
  98     @Test
  99     public void jmx() {
 100         run(new JMXExecutor());
 101     }
 102 }