/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * 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();

        }

    }

}