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How to create a file lock on a file |
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This Java tips illustrates a method of creating a file lock on a file. Developer may note
that the file lock may depend on the platform. On some platforms, the file lock is
advisory, which means that unless an application checks for a file lock, it will not be
prevented from accessing the file. On other platforms, the file lock is mandatory, which
means that a file lock prevents any application from accessing the file.
try {
// Get a file channel for the file
File file = new File("filename");
FileChannel channel =
new RandomAccessFile(file, "rw").getChannel();
// Use the file channel to create a lock on the file.
// This method blocks until it can retrieve the lock.
FileLock lock = channel.lock();
// Try acquiring the lock without blocking. This method returns
// null or throws an exception if the file is already locked.
try {
lock = channel.tryLock();
} catch (OverlappingFileLockException e) {
// File is already locked in this thread or virtual machine
}
// Remember to release the lock
lock.release();
// Close the file
channel.close();
} catch (Exception e) {
}
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