如何避免从具有相同参数的多个线程执行方法？

Question

How to avoid method execution from multiple threads if they pass same parameter. for example I have this method:

public void sync(int x){    

    //sync code -> write code here which is eligible for sync
}

If this method is running with parameter x=5 and another request with same value x=5 comes, it should be added in queue.

Answer 1

You can use name-based lock .

public void sync(int x){
    Lock lock = new NameBasedLock(String.valueOf(x));
    lock.lock();
    try {
        doSomething();
    } finally {
        lock.unlock();
    }
}

Answer 2

You can use simply

   public synchronized void sync(int x){
       //Body of method

}