Play 2.2.1 Java: Whats the equivalent of @before filters from play 1.X?

Question

I want to implement a setUserIfPresent() method that puts a user object into the context like Http.Context.current().args.put(\"user\", user);

Answer 1

While you could use filters (or Interceptors) in the "traditional" webapp framework way, the Play-preferred way seems to definitely be to compose custom Action methods; see the documentation on Action Composition.

If you follow their style, you'll define a new Action implementation like this:

public class UserContextInjectingAction extends play.mvc.Action.Simple {

    public F.Promise<SimpleResult> call(Http.Context ctx) throws Throwable {
        Logger.info("Injecting user data into context " + ctx);
        injectUser(ctx); // Written by you
        return delegate.call(ctx);
    }

}

And you'd end up with controller code that looks like this:

@With(UserContextInjectingAction.class)
public static Result showHomePage() {
    return ok("Welcome");
}