144 lines
4.5 KiB
Java
144 lines
4.5 KiB
Java
/*
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* Copyright (c) 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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import java.io.File;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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import java.nio.channels.FileLock;
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import java.nio.channels.OverlappingFileLockException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import jdk.test.lib.util.FileUtils;
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/*
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* @test
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* @bug 8166253
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* @summary Verify that OverlappingFileLockException is thrown when expected.
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* @library .. /test/lib
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* @build jdk.test.lib.util.FileUtils
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* @run main/othervm FileLockGC
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*/
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public class FileLockGC {
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public enum TestType {
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NO_GC_NO_RELEASE(true),
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// A hypothetical 'GC_THEN_RELEASE' case is infeasible
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RELEASE(false),
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RELEASE_THEN_GC(false),
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GC(true);
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private final boolean exceptionExpected;
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TestType(boolean exceptionExpected) {
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this.exceptionExpected = exceptionExpected;
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}
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boolean exceptionExpected() {
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return exceptionExpected;
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}
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}
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public static void main(String[] args) throws Exception {
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final File f = new File(System.getProperty("test.dir", ".")
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+ File.separator + "junk.txt");
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final Path p = f.toPath();
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int failures = 0;
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for (TestType t : TestType.values()) {
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try {
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if (!testFileLockGC(f, t)) {
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failures++;
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}
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} finally {
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FileUtils.deleteFileIfExistsWithRetry(p);
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}
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}
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if (failures != 0) {
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throw new RuntimeException("Test had " + failures + " failure(s)");
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}
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}
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private static boolean testFileLockGC(File f, TestType type)
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throws InterruptedException, IOException {
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System.out.printf("Test %s starting%n", type.toString());
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final RandomAccessFile raf1 = new RandomAccessFile(f, "rw");
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FileLock lock1 = raf1.getChannel().tryLock();
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WeakReference<FileLock> ref1 = new WeakReference(lock1);
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switch (type) {
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case GC:
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lock1 = null;
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System.gc();
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break;
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case RELEASE:
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lock1.release();
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break;
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case RELEASE_THEN_GC:
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lock1.release();
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lock1 = null;
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System.gc();
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break;
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default: // NO_GC_NO_RELEASE
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// lock1 is neither collected nor released
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break;
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}
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final RandomAccessFile raf2 = new RandomAccessFile(f, "rw");
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boolean success = true;
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FileLock lock2 = null;
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try {
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lock2 = raf2.getChannel().tryLock();
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if (type.exceptionExpected()) {
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System.err.printf
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("No expected OverlappingFileLockException for test %s%n",
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type.toString());
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success = false;
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}
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} catch (OverlappingFileLockException ofe) {
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if (!type.exceptionExpected()) {
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System.err.printf
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("Unexpected OverlappingFileLockException for test %s%n",
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type.toString());
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success = false;
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}
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} finally {
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if (lock1 != null) {
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lock1.release();
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}
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if (lock2 != null) {
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lock2.release();
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}
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raf2.close();
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raf1.close();
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System.out.printf("Test %s finished%n", type.toString());
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}
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return success;
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}
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}
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