How to use

makeLock

method

in

org.apache.lucene.store.SimpleFSLockFactory

SimpleDateFormat fmt = new SimpleDateFormat(DATE_FMT);
directoryName = "snapshot." + fmt.format(new Date());
lock = lockFactory.makeLock(directoryName + ".lock");
if (lock.isLocked()) return;
snapShotDir = new File(snapDir, directoryName);