1 /*
   2  * Copyright (c) 2007, 2018, 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 /*
  25  * @test
  26  * @key stress gc randomness
  27  *
  28  * @summary converted from VM Testbase gc/gctests/SoftReference/soft003.
  29  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
  30  *
  31  * @library /vmTestbase
  32  *          /test/lib
  33  * @run driver jdk.test.lib.FileInstaller . .
  34  * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.SoftReference.soft003.soft003 -t 1
  35  */
  36 
  37 package gc.gctests.SoftReference.soft003;
  38 
  39 import java.lang.ref.Reference;
  40 import nsk.share.test.*;
  41 import nsk.share.gc.*;
  42 import nsk.share.TestFailure;
  43 import java.lang.ref.SoftReference;
  44 
  45 /**
  46  * Test that GC clears soft references before throwing OOM.
  47  *
  48  * This test creates a number of soft references, then provokes
  49  * GC with Algorithms.eatMemory() and checks that all references
  50  * have been cleared.
  51  */
  52 public class soft003 extends ThreadedGCTest {
  53 
  54     class Worker implements Runnable {
  55 
  56         private int arrayLength;
  57         private int objectSize = 100;
  58         private Reference[] references;
  59 
  60         public void run() {
  61             for (int i = 0; i < arrayLength; ++i) {
  62                 references[i] = new SoftReference<MemoryObject>(new MemoryObject(LocalRandom.nextInt(objectSize)));
  63             }
  64             Algorithms.eatMemory(getExecutionController());
  65             if (!getExecutionController().continueExecution()) {
  66                 return;
  67             }
  68             // Check that all references have been cleared
  69             int n = 0;
  70             for (int i = 0; i < arrayLength; ++i) {
  71                 if (references[i].get() != null) {
  72                     ++n;
  73                 }
  74             }
  75             if (n != 0) {
  76                 references = null;
  77                 throw new TestFailure("Some of the references have been not cleared: " + n);
  78             }
  79         }
  80 
  81         public void Worker() {
  82             arrayLength = Memory.getArrayLength(runParams.getTestMemory(), Memory.getReferenceSize() + objectSize);
  83             System.out.println("Array size: " + arrayLength);
  84             references = new Reference[arrayLength];
  85         }
  86     }
  87 
  88     @Override
  89     protected Runnable createRunnable(int i) {
  90         return new Worker();
  91     }
  92 
  93     public static void main(String[] args) {
  94         GC.runTest(new soft003(), args);
  95     }
  96 }