jdk/test/java/lang/ref/SoftReference/Bash.java
author martin
Tue, 15 Sep 2015 21:56:04 -0700
changeset 32649 2ee9017c7597
parent 5506 202f599c92aa
permissions -rw-r--r--
8136583: Core libraries should use blessed modifier order Summary: Run blessed-modifier-order script (see bug) Reviewed-by: psandoz, chegar, alanb, plevart
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/*
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 * Copyright (c) 1997, 1998, 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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/* @test
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 * @bug 4076283
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 * @summary java.lang.ref.SoftReference should reliably prevent
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 *          OutOfMemoryErrors
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 * @author Peter Jones
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 * @author Mark Reinhold
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 */
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/* If this test fails, an OutOfMemoryError will be thrown */
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import java.lang.ref.SoftReference;
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public class Bash {
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    static class TestReference extends SoftReference {
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        public static TestReference head;
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        public TestReference next;
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        public TestReference(Object referent) {
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            super(referent);
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            next = head;
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            head = this;
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        }
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    }
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    static final int NUM_BLOCKS = 2048;
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    static final int BLOCK_SIZE = 32768;
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    public static void main(String[] args) throws Exception {
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        for (int i = 0; i < NUM_BLOCKS; ++ i) {
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            TestReference ref = new TestReference(new byte[BLOCK_SIZE]);
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        }
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        int emptyCount = 0;
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        int fullCount = 0;
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        for (TestReference r = TestReference.head; r != null; r = r.next) {
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            if (r.get() == null) emptyCount++;
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            else fullCount++;
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        }
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        System.err.println(fullCount + " full, " + emptyCount + " empty ");
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    }
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}