Locks.java

/*
    This is using single Int to manage 32 locks in thread safe way. 
    This has less memory usage as compared to JDK lock which uses one Int(32 Bytes) to manage single lock.
 */

public class Locks {
    public static final int INT_BYTES = 32;
    private AtomicInteger lock = new AtomicInteger(0);

    public boolean lock(int index) {
        int value = lock.get();
        if (Bits.isSet(value, index)) {
            return false;
        }
        int newLock = Bits.set(value, index);
        return lock.compareAndSet(value, newLock);
    }

    public boolean release(int index) {
        int value = lock.get();
        int newLock = Bits.clear(value, index);
        return lock.compareAndSet(value, newLock);
    }
}