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/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.nio.channels.FileLock;
import java.nio.channels.OverlappingFileLockException;
import java.nio.file.Files;
import java.nio.file.Path;
import jdk.test.lib.util.FileUtils;
/*
* @test
* @bug 8166253
* @summary Verify that OverlappingFileLockException is thrown when expected.
* @library .. /test/lib
* @build jdk.test.lib.util.FileUtils
* @run main/othervm FileLockGC
*/
public class FileLockGC {
public enum TestType {
NO_GC_NO_RELEASE(true),
// A hypothetical 'GC_THEN_RELEASE' case is infeasible
RELEASE(false),
RELEASE_THEN_GC(false),
GC(true);
private final boolean exceptionExpected;
TestType(boolean exceptionExpected) {
this.exceptionExpected = exceptionExpected;
}
boolean exceptionExpected() {
return exceptionExpected;
}
}
public static void main(String[] args) throws Exception {
final File f = new File(System.getProperty("test.dir", ".")
+ File.separator + "junk.txt");
final Path p = f.toPath();
int failures = 0;
for (TestType t : TestType.values()) {
try {
if (!testFileLockGC(f, t)) {
failures++;
}
} finally {
FileUtils.deleteFileIfExistsWithRetry(p);
}
}
if (failures != 0) {
throw new RuntimeException("Test had " + failures + " failure(s)");
}
}
private static boolean testFileLockGC(File f, TestType type)
throws InterruptedException, IOException {
System.out.printf("Test %s starting%n", type.toString());
final RandomAccessFile raf1 = new RandomAccessFile(f, "rw");
FileLock lock1 = raf1.getChannel().tryLock();
WeakReference<FileLock> ref1 = new WeakReference(lock1);
switch (type) {
case GC:
lock1 = null;
System.gc();
break;
case RELEASE:
lock1.release();
break;
case RELEASE_THEN_GC:
lock1.release();
lock1 = null;
System.gc();
break;
default: // NO_GC_NO_RELEASE
// lock1 is neither collected nor released
break;
}
final RandomAccessFile raf2 = new RandomAccessFile(f, "rw");
boolean success = true;
FileLock lock2 = null;
try {
lock2 = raf2.getChannel().tryLock();
if (type.exceptionExpected()) {
System.err.printf
("No expected OverlappingFileLockException for test %s%n",
type.toString());
success = false;
}
} catch (OverlappingFileLockException ofe) {
if (!type.exceptionExpected()) {
System.err.printf
("Unexpected OverlappingFileLockException for test %s%n",
type.toString());
success = false;
}
} finally {
if (lock1 != null) {
lock1.release();
}
if (lock2 != null) {
lock2.release();
}
raf2.close();
raf1.close();
System.out.printf("Test %s finished%n", type.toString());
}
return success;
}
}
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