Get lock by name using java.util.concurrent

LockByName

package com.mercadolibre.concurrent;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;

public class LockByName<L> {

	ConcurrentHashMap<String, L> mapStringLock;
	
	public LockByName(){
		mapStringLock = new ConcurrentHashMap<String, L>();
	}
	
	public LockByName(ConcurrentHashMap<String, L> mapStringLock){
		this.mapStringLock = mapStringLock;
	}

	@SuppressWarnings("unchecked")
	public L getLock(String key) {
		L initValue = (L) createIntanceLock();
		L lock = mapStringLock.putIfAbsent(key, initValue);
		if (lock == null) {
			lock = initValue;
		}
		return lock;
	}

	protected Object createIntanceLock() {
		return new ReentrantLock();
	}
	
	public static void main(String[] args) {
		
		LockByName<ReentrantLock> reentrantLocker = new LockByName<ReentrantLock>();
		
		ReentrantLock reentrantLock1 = reentrantLocker.getLock("pepe");
		
		try {
			reentrantLock1.lock();
			//DO WORK
			
		}finally{
			reentrantLock1.unlock();

		}
		
	}
	
}