private void lock() throws IOException, BlockStoreException {
if (!semaphores.tryAcquire(fileName)) {
throw new BlockStoreException("File in use");
}
try {
lock = channel.tryLock();
} catch (OverlappingFileLockException e) {
semaphores.release(fileName);
lock = null;
}
if (lock == null) {
try {
this.file.close();
} finally {
this.file = null;
}
throw new BlockStoreException("Could not lock file");
}
}
public void close() throws BlockStoreException {
ensureOpen();
try {
file.close();
} catch (IOException e) {
throw new BlockStoreException(e);
} finally {
semaphores.release(this.fileName);
file = null;
}
}