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  * @build com.oracle.java.testlibrary.*
  39  * @build com.oracle.java.testlibrary.dcmd.*
  40  * @run testng RunFinalizationTest
  41  */
  42 public class RunFinalizationTest {
  43     static ReentrantLock lock = new ReentrantLock();
  44     static Condition cond = lock.newCondition();
  45     static volatile boolean wasFinalized = false;
  46     static volatile boolean wasInitialized = false;
  47 
  48     class MyObject {
  49         public MyObject() {
  50             /* Make sure object allocation/deallocation is not optimized out */
  51             wasInitialized = true;
  52         }
  53 
  54         protected void finalize() {
  55             lock.lock();
  56             wasFinalized = true;
  57             cond.signalAll();
  58             lock.unlock();
  59         }
  60     }
  61 
  62     public static MyObject o;
  63 
  64     public void run(CommandExecutor executor) {
  65         lock.lock();
  66         o = new MyObject();
  67         o = null;
  68         System.gc();
  69         executor.execute("GC.run_finalization");
  70 
  71         int waited = 0;
  72         int waitTime = 15;
  73 
  74         try {
  75             System.out.println("Waiting for signal from finalizer");
  76 
  77             while (!cond.await(waitTime, TimeUnit.SECONDS)) {
  78                 waited += waitTime;
  79                 System.out.println(String.format("Waited %d seconds", waited));
  80             }
  81 
  82             System.out.println("Received signal");
  83         } catch (InterruptedException e) {
  84             Assert.fail("Test error: Interrupted while waiting for signal from finalizer", e);
  85         } finally {
  86             lock.unlock();
  87         }
  88 
  89         if (!wasFinalized) {
  90             Assert.fail("Test failure: Object was not finalized");
  91         }
  92     }
  93 
  94     @Test
  95     public void jmx() {
  96         run(new JMXExecutor());
  97     }
  98 }