Synchronous webservice

Question

I have a Restful Webservice developed in Java.

I need a (service) method that is synchronous. But I can’t do that on the client side, it has to be done on the Webservice side, because this service can only be ordered once at a time. Another application can only request the method (service) if it is not running.

How can I do that on Webservice’s side?

Answer 1

Your question seemed confusing. But if I understand well what you want is that the method can not be running twice at the same time even by different customers.

Therefore, the use of a block synchronized will solve your problem if you only have a single server process meeting requests. For example:

public class MeuServico {

    private static final Object bloqueio = new Object();

    public void meuMetodo() {
        synchronized (bloqueio) {
            // ...
        }
    }
}

If there are multiple lawsuits responding to requests, the situation gets a little more complicated. In this case you can have a database with a table containing a single row and a single column to simulate the mutex above. The content of this data is an identifier that tells who is currently running the method.