Extends RequestFactoryServlet

Hi,

I have a question. I use RequestFactory in a database Proyect. And I
need use a method in the server but not inside any Entity (like
persist for instance). I need count, for example, files in a folder on
the server side, or send a string to the server to do something with,
and return a boolean...

Need I extend RequestFacotyServlet? And If I need to, how I must do
the RequestContext and RequestFactory interfaces?

Thanks in advance

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