Examples of java.nio.channels.FileChannel.lock()

java.nio.channels.FileChannel.lock()
Obtain an exclusive lock on this file.
This is a convenience method for acquiring a maximum length lock on a file. It is equivalent to:
```
 fileChannel.lock(0L, Long.MAX_VALUE, false) 
```
@return the lock object representing the locked file area. @throws ClosedChannelException the file channel is closed. @throws NonWritableChannelException this channel was not opened for writing. @throws OverlappingFileLockException Either a lock is already held that overlaps this lock request, or another thread is waiting to acquire a lock that will overlap with this request. @throws FileLockInterruptionException The calling thread was interrupted while waiting to acquire the lock. @throws AsynchronousCloseException The channel was closed while the calling thread was waiting to acquire the lock. @throws IOException some other problem occured obtaining the requested lock.

        }


        // try to acquire rw lock on the file before we can consume it
        FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
        try {
            FileLock lock = channel.lock();
            if (LOG.isTraceEnabled()) {
                LOG.trace("Acquired exclusive read lock: " + lock + " to file: " + file);
            }
            // just release it now we dont want to hold it during the rest of the processing
            lock.release();

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        f.createNewFile();
        RandomAccessFile raf = new java.io.RandomAccessFile(fileName, "r");
        FileChannel fcr = raf.getChannel();


        try {
            fcr.lock(0L, Long.MAX_VALUE, false);
            fail("NonWritableChannelException expected!");
        } catch (NonWritableChannelException e) {}
        raf.close();
    }

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        out.close();


        fc = new RandomAccessFile(f, "rw").getChannel();
        anotherfc = new RandomAccessFile(f, "rw").getChannel();


        assertNotNull(fc.lock());


        ByteBuffer readBuf = ByteBuffer.allocate(100);
        ByteBuffer writeBuf = ByteBuffer.wrap("bytes".getBytes());
        try {
            try {

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        writer.doWrite(q);


        File file = new File(String.format("%s/%s-%s.json", outputPath, isQueue ? "queue": "topic", exchangeName));
        FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
        try {
            FileLock lock = channel.lock();
            try {
                mapper.writeValue(file, metric);
            }
            catch(Exception e) {
                logger.error("write metric error: ", e);

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    private synchronized void writeToFile(String action) {
        Date date = new Date();
        try {
            FileOutputStream out = new FileOutputStream(logFile, true);
            FileChannel channel = out.getChannel();
            FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
            PrintWriter writer = new PrintWriter(out, false);
            writer.println(DATE_FORMAT.format(date)+" - "+action+" - "+username);
            writer.flush();
            writer.close();
            if(lock.isValid()) {

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    private synchronized void writeToFile(String action) {
        Date date = new Date();
        try {
            FileOutputStream out = new FileOutputStream(logFile, true);
            FileChannel channel = out.getChannel();
            FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
            PrintWriter writer = new PrintWriter(out, false);
            writer.println(DATE_FORMAT.format(date)+" - "+action+" - "+username);
            writer.flush();
            writer.close();
            if(lock.isValid()) {

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        if (timeoutSec == 0) {
            lock_ = ch.tryLock(); /* no wait */


        } else if (timeoutSec < 0) {
            lock_ = ch.lock(); /* wait */
            
        } else {
            final int sleepMs = 100;
            int elapsedMs = 0;
            while (elapsedMs < timeoutSec * 1000) {

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            if (LOG.isDebugEnabled()) {
                LOG.debug("Locking the file: " + file + " using the lock file name: " + lockFileName);
            }


            FileChannel channel = new RandomAccessFile(lockFileName, "rw").getChannel();
            FileLock lock = channel.lock();
            if (lock != null) {
                exchange.setProperty("org.apache.camel.fileChannel", channel);
                exchange.setProperty("org.apache.camel.file.lock", lock);
                exchange.setProperty("org.apache.camel.file.lock.name", lockFileName);
                return true;

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        }


        // try to acquire rw lock on the file before we can consume it
        FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
        try {
            FileLock lock = channel.lock();
            if (LOG.isTraceEnabled()) {
                LOG.trace("Acquired exclusive read lock: " + lock + " to file: " + file);
            }
            // just release it now we dont want to hold it during the rest of the processing
            lock.release();

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        try {
            File file = new File(logFile);
            file.getParentFile().mkdirs();
            FileOutputStream out = new FileOutputStream(file, true);
            FileChannel channel = out.getChannel();
            FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
            PrintWriter writer = new PrintWriter(out, false);
            String actionStr;
            switch (action) {
            case ATTEMPT: actionStr = "Authentication attempt"; break;
            case SUCCESS: actionStr = "Authentication succeeded"; break;

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