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javaconcurrencylockingejb

Java, EJB, Concurrency lock for all methods

I have EJB with two methods

@Singleton(name = "RatingCalculatorEJB")
public class RatingCalculatorBean {

    public void countRating() {}

    public void countRating(int someID) {}
}

By default all methods has concurrency lock: @Lock(LockType.WRITE) If method invoked by any thread - another thread will wait to invoke this method.

But I need more - if any method invoked by a thread, all other threads that call any method of EJB should wait. Does I have any way to do it?

The same question for @Stateless beans

Solution

  • @Lock(LockType.WRITE) locks ALL EJB methods of the bean, so it already does what you want.

    Stateless beans only handle one client at a time, so concurrency should rarely be a problem there.