/*
* Copyright (c) 2001, 2010, 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
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* questions.
*/
/**
* @test
* @bug 4486154 4495729
* @summary The FileChannel file locking
*/
import java.io.*;
import java.nio.channels.*;
import java.nio.*;
/**
* Testing FileChannel's locking methods.
*/
public class TryLock {
public static void main(String[] args) throws Exception {
test1(true, true);
test1(false, true);
test1(true, false);
test1(false, false);
test2(true, true);
test2(false, true);
test2(true, false);
test2(false, false);
test3(true, true);
test3(false, true);
test3(true, false);
test3(false, false);
}
public static void test1(boolean shared, boolean trylock) throws Exception {
File testFile = File.createTempFile("test1", null);
FileInputStream fis = new FileInputStream(testFile);
FileChannel fc = fis.getChannel();
FileLock fl = null;
try {
if (trylock)
fl = fc.tryLock(0, fc.size(), shared);
else
fl = fc.lock(0, fc.size(), shared);
if (!shared)
throw new RuntimeException("No exception thrown for test1");
} catch (NonWritableChannelException e) {
if (shared)
throw new RuntimeException("Exception thrown for wrong case test1");
} finally {
if (fl != null)
fl.release();
fc.close();
testFile.delete();
}
}
public static void test2(boolean shared, boolean trylock) throws Exception {
File testFile = File.createTempFile("test2", null);
FileOutputStream fis = new FileOutputStream(testFile);
FileChannel fc = fis.getChannel();
FileLock fl = null;
try {
if (trylock)
fl = fc.tryLock(0, fc.size(), shared);
else
fl = fc.lock(0, fc.size(), shared);
if (shared)
throw new RuntimeException("No exception thrown for test2");
} catch (NonReadableChannelException e) {
if (!shared)
throw new RuntimeException("Exception thrown incorrectly for test2");
} finally {
if (fl != null)
fl.release();
fc.close();
testFile.delete();
}
}
public static void test3(boolean shared, boolean trylock) throws Exception {
File testFile = File.createTempFile("test3", null);
RandomAccessFile fis = new RandomAccessFile(testFile, "rw");
FileChannel fc = fis.getChannel();
try {
FileLock fl = null;
if (trylock)
fl = fc.tryLock(0, fc.size(), shared);
else
fl = fc.lock(0, fc.size(), shared);
fl.release();
} finally {
fc.close();
testFile.delete();
}
}
}