117 lines
3.8 KiB
Java
117 lines
3.8 KiB
Java
/*
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* Copyright (c) 2004, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.gctests.WeakReference;
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import java.util.Random;
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import java.util.ArrayList;
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import java.lang.ref.WeakReference;
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import nsk.share.TestFailure;
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import nsk.share.gc.GC;
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import nsk.share.gc.GCTestBase;
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/**
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* Original description from JRockit test:
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*
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* Tests for the WeakReference handling in JRockit.
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*
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* This test must be run with a mx value set, as well as with
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* -XXfullsystemgc, to ensure Runtime.maxMemory() doesn't return 0
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* and that System.gc() gets run when called from Java.
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*/
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public class WeakReferenceTest extends GCTestBase {
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/**
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* Test that all WeakReferences has been cleared after
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* the GC has run. This test should not throw an OOME
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* during the test execution.
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*
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*/
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@Override
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public void run() {
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long seed;
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int minSize;
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int maxSize;
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double memPercentToFill;
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long totalMemAlloced = 0;
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long memToAlloc = 0;
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Runtime r = Runtime.getRuntime();
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seed = runParams.getSeed();
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minSize = 2048;
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maxSize = 32768;
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memPercentToFill = 0.45;
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memToAlloc = (long) (r.maxMemory() * memPercentToFill);
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Random rndGenerator = new Random(seed);
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long multiplier = maxSize - minSize;
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ArrayList arrWeakRefs = new ArrayList();
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try {
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while (totalMemAlloced < memToAlloc) {
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int allocationSize = ((int) (rndGenerator.nextDouble()
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* multiplier)) + minSize;
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byte[] tmp = new byte[allocationSize];
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arrWeakRefs.add(new WeakReference(tmp));
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totalMemAlloced += allocationSize;
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// Make sure the temporary object is dereferenced
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tmp = null;
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}
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System.gc();
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long numberOfNotNulledObjects = 0;
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for (int i = 0; i < arrWeakRefs.size(); i++) {
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WeakReference wr = (WeakReference) arrWeakRefs.get(i);
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Object o = wr.get();
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if (o != null) {
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numberOfNotNulledObjects++;
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}
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}
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if (numberOfNotNulledObjects > 0) {
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throw new TestFailure(numberOfNotNulledObjects + " out of "
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+ arrWeakRefs.size() + " WeakReferences was not "
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+ "null after the GC had run");
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}
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log.info("All WeakReferences was cleared after the "
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+ "GC had run");
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} catch (OutOfMemoryError oome) {
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throw new TestFailure("OutOfMemoryException was thrown. This should "
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+ "not happen during the execution of this test.");
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} finally {
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arrWeakRefs = null;
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}
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}
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public static void main(String[] args) {
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GC.runTest(new WeakReferenceTest(), args);
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}
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}
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