Java process-safe locker

Locker.java

/**
 * Multi-process lock
 *
 * @author kaede
 * @version date 16/9/6
 */
class Locker {

    public static final int EXPIRED_TIME = 30 * 60 * 1000; // 30 minutes

    final File lockFile;

    public Locker(@NonNull String path) {
        lockFile = new File(path);
    }

    public boolean tryLock() {
        boolean mkdir = lockFile.mkdirs();
        boolean expired = isExpired();
        return mkdir || expired;
    }

    public void release() {
        FileUtils.deleteQuietly(lockFile);
    }

    public boolean isExpired() {
        long interval = System.currentTimeMillis() - lockFile.lastModified();
        return interval > EXPIRED_TIME;
    }
}