Java Utililty Methods FileLock

List of utility methods to do FileLock

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Description

The list of methods to do FileLock are organized into topic(s).

Method

booleanisBlocking(Channel channel)
Indicates if the channel is in blocking mode. 
boolean result = true;
if (channel instanceof SelectableChannel) {
    SelectableChannel selectableChannel = (SelectableChannel) channel;
    result = selectableChannel.isBlocking();
return result;
booleanisFileLocked(File file)
Uses Java 1.4's FileLock class to test for a file lock 
boolean isLocked = false;
FileOutputStream input = null;
FileLock lock = null;
if (!file.exists()) {
    return false;
try {
    input = new FileOutputStream(file);
...
booleanisFileLocked(File file)
is File Locked 
if (!file.exists()) {
    return false;
if (file.isDirectory()) {
    return false;
if (isSymlink(file)) {
    return false;
...
booleanisLocked(File file)
is Locked 
if (!file.isFile()) {
    return false;
try {
    RandomAccessFile raf = new RandomAccessFile(file, "rw");
    try {
        FileChannel channel = raf.getChannel();
        FileLock lock = channel.tryLock();
...
booleanisLocked(File file)
is Locked 
if (!file.isFile()) {
    return false;
try (FileChannel fc = FileChannel.open(file.toPath(), StandardOpenOption.CREATE,
        StandardOpenOption.WRITE)) {
    FileLock lock = fc.tryLock();
    if (lock != null) {
        lock.release();
...
FileOutputStreamlock(File file)
lock 
try {
    FileOutputStream out = new FileOutputStream(file);
    FileLock lock = out.getChannel().tryLock();
    if (lock == null) {
        throw new IllegalStateException("Cannot acquire a lock on file " + file
                + ". Please verify that this file is not used by another process.");
    locks.put(file, lock);
...
FileLocklockFile(File file)
Locks a file for the current JVM. 
FileOutputStream input = null;
FileLock lock = null;
try {
    input = new FileOutputStream(file);
    FileChannel fileChannel = input.getChannel();
    lock = fileChannel.tryLock();
    if (lock.isValid())
        return lock;
...
FileLocklockFile(File file, RandomAccessFile raf)
lock File 
FileLock fl = null;
FileChannel fc = raf.getChannel();
if (fc != null) {
    try {
        fl = fc.tryLock();
    } catch (OverlappingFileLockException ex) {
        throw new IOException(file.getPath() + ":\nDatei ist gesperrt.\n"
                + "Bitte schlie\u00DFen Sie die Datei in dem Programm,\n"
...
booleanlockFileExists(File file)
lock File Exists 
Path lockFilePath = getLockFilePath(file);
return Files.exists(lockFilePath);
SocketChannelopenTcpSocket(boolean blocking)
Open and return a socket channel with the specified blocking mode enabled or null if there is an error opening the channel. 
try {
    return (SocketChannel) SocketChannel.open().configureBlocking(blocking);
} catch (Exception ex) {
    return null;