76 lines
2.6 KiB
Java
76 lines
2.6 KiB
Java
/*
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* Copyright (c) 2002, 2020, 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 4625907 8246729
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* @summary Testing force()
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* @library /test/lib
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* @build jdk.test.lib.RandomFactory
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* @run main/othervm Force
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* @key randomness
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*/
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import java.io.File;
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import java.io.RandomAccessFile;
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import java.nio.MappedByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.file.Files;
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import static java.nio.file.StandardOpenOption.*;
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import java.util.Random;
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import jdk.test.lib.RandomFactory;
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public class Force {
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public static void main(String[] args) throws Exception {
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test1();
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test2();
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}
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private static void test1() throws Exception {
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Random random = RandomFactory.getRandom();
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long filesize = random.nextInt(3*1024*1024);
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int cut = random.nextInt((int)filesize);
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File file = File.createTempFile("Blah", null);
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file.deleteOnExit();
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try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
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raf.setLength(filesize);
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FileChannel fc = raf.getChannel();
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MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, cut, filesize-cut);
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mbb.force();
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}
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// improve chance that mapped buffer will be unmapped
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System.gc();
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Thread.sleep(500);
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}
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private static void test2() throws Exception {
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var path = Files.createTempFile("test", "map");
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var channel = FileChannel.open(path, READ, WRITE);
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MappedByteBuffer buffer =
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channel.map(FileChannel.MapMode.READ_WRITE, 0, 1000);
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buffer.putInt(1234);
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buffer.limit(4);
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buffer.force();
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}
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}
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