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
  27  *
  28  * @summary converted from VM Testbase gc/gctests/SoftReference/soft005.
  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.soft005.soft005 -t 1
  35  */
  36 
  37 package gc.gctests.SoftReference.soft005;
  38 
  39 import nsk.share.gc.*;
  40 import java.lang.ref.SoftReference;
  41 
  42 /**
  43  * Test that GC correctly clears soft references.
  44  *
  45  * This test creates a number of soft references,
  46  * each of which points to the next,
  47  * then provokes GC with Algorithms.eatMemory(). Then
  48  * checks that first reference has been cleared.
  49  */
  50 public class soft005 extends ThreadedGCTest {
  51 
  52     class Worker implements Runnable {
  53 
  54         private int length = 10000;
  55         private int objectSize = 10000;
  56         private SoftReference[] references;
  57 
  58         public Worker() {
  59             System.out.println("Array size: " + length);
  60             System.out.println("Object size: " + objectSize);
  61             references = new SoftReference[length];
  62         }
  63 
  64         private void makeReferences() {
  65             references[length - 1] = null;
  66             MemoryObject obj = new MemoryObject(objectSize);
  67             references[0] = new SoftReference(obj);
  68             for (int i = 1; i < length; ++i) {
  69                 references[i] = new SoftReference(references[i - 1]);
  70             }
  71             for (int i = 0; i < length - 1; ++i) {
  72                 references[i] = null;
  73             }
  74         }
  75 
  76         public void run() {
  77             makeReferences();
  78             Algorithms.eatMemory(getExecutionController());
  79             if (!getExecutionController().continueExecution()) {
  80                 return;
  81             }
  82             if (references[length - 1].get() != null) {
  83                 log.error("Last soft reference has not been cleared");
  84                 setFailed(true);
  85             }
  86         }
  87     }
  88 
  89     @Override
  90     protected Runnable createRunnable(int i) {
  91         return new Worker();
  92     }
  93 
  94     public static void main(String[] args) {
  95         GC.runTest(new soft005(), args);
  96     }
  97 }