Examples with FileLock java.nio.channels.FileLock used on opensource projects

Example 26 with FileLock

use of java.nio.channels.FileLock in project graphhopper by graphhopper.

the class NativeFSLockFactory method main.

public static void main(String[] args) throws IOException {
    // trying FileLock mechanics in different processes
    File file = new File("tmp.lock");
    file.createNewFile();
    FileChannel channel = new RandomAccessFile(file, "r").getChannel();
    boolean shared = true;
    FileLock lock1 = channel.tryLock(0, Long.MAX_VALUE, shared);
    System.out.println("locked " + lock1);
    System.in.read();
    System.out.println("release " + lock1);
    lock1.release();
}

Example 27 with FileLock

use of java.nio.channels.FileLock in project gocd by gocd.

the class GoConfigFileWriter method writeToConfigXmlFile.

public synchronized void writeToConfigXmlFile(String content) {
    FileChannel channel = null;
    FileOutputStream outputStream = null;
    FileLock lock = null;
    try {
        RandomAccessFile randomAccessFile = new RandomAccessFile(fileLocation(), "rw");
        channel = randomAccessFile.getChannel();
        lock = channel.lock();
        randomAccessFile.seek(0);
        randomAccessFile.setLength(0);
        outputStream = new FileOutputStream(randomAccessFile.getFD());
        IOUtils.write(content, outputStream, UTF_8);
    } catch (Exception e) {
        throw new RuntimeException(e);
    } finally {
        if (channel != null && lock != null) {
            try {
                lock.release();
                channel.close();
                IOUtils.closeQuietly(outputStream);
            } catch (IOException e) {
                LOGGER.error("Error occured when releasing file lock and closing file.", e);
            }
        }
    }
}

Example 28 with FileLock

use of java.nio.channels.FileLock in project j2objc by google.

the class FileChannelTest method useFileChannel.

private void useFileChannel() throws IOException {
    File file = File.createTempFile("j2objc", "tmp");
    ChannelGetter channelGetter = new ChannelGetter();
    channelGetter.createChannel(file);
    // The FileOutputStream used to create the channel is released at this point.
    FileChannel channel = channelGetter.get();
    FileLock lock = channel.lock();
    lock.close();
    channel.close();
    assertTrue(file.delete());
}

Example 29 with FileLock

use of java.nio.channels.FileLock in project jimfs by google.

the class JimfsFileChannelTest method testLock.

@Test
public void testLock() throws IOException {
    FileChannel channel = channel(regularFile(10), READ, WRITE);
    assertNotNull(channel.lock());
    assertNotNull(channel.lock(0, 10, false));
    assertNotNull(channel.lock(0, 10, true));
    assertNotNull(channel.tryLock());
    assertNotNull(channel.tryLock(0, 10, false));
    assertNotNull(channel.tryLock(0, 10, true));
    FileLock lock = channel.lock();
    assertTrue(lock.isValid());
    lock.release();
    assertFalse(lock.isValid());
}

Example 30 with FileLock

use of java.nio.channels.FileLock in project j2objc by google.

the class FileChannelImpl method basicLock.

private FileLock basicLock(long position, long size, boolean shared, boolean wait) throws IOException {
    int accessMode = (mode & O_ACCMODE);
    if (accessMode == O_RDONLY) {
        if (!shared) {
            throw new NonWritableChannelException();
        }
    } else if (accessMode == O_WRONLY) {
        if (shared) {
            throw new NonReadableChannelException();
        }
    }
    if (position < 0 || size < 0) {
        throw new IllegalArgumentException("position=" + position + " size=" + size);
    }
    FileLock pendingLock = new FileLockImpl(this, position, size, shared);
    addLock(pendingLock);
    StructFlock flock = new StructFlock();
    flock.l_type = (short) (shared ? F_RDLCK : F_WRLCK);
    flock.l_whence = (short) SEEK_SET;
    flock.l_start = position;
    flock.l_len = translateLockLength(size);
    boolean success = false;
    try {
        success = (Libcore.os.fcntlFlock(fd, wait ? F_SETLKW64 : F_SETLK64, flock) != -1);
    } catch (ErrnoException errnoException) {
        throw errnoException.rethrowAsIOException();
    } finally {
        if (!success) {
            removeLock(pendingLock);
        }
    }
    return success ? pendingLock : null;
}