java - Is it possible to create necessary / required interfaces?

Question

i have a little kont in my brain about structuring our code. We have a REST Backend based on SpringBoot. To handle requests regarding to security checks we use HandlerInterceptors. In some specific cases we need a specific interceptor and not our default one. The default one is registered in a 3rd party lib that no one can forget it. But i want all coders to think about this specific interceptor. Actually, i just said it to them to achieve this.

Here's my question: Is there an option to create required (or necessary) interfaces which must be implemented? This would be a way to provide our security code by lib and to have the security that every coder implemented our specific interface (also if he just does nothing with it).

pseudo code:

public interface thinkForIt(){

Object SecBean specificSecBean;

public void methodToThinkOn();

}

public SecImpl implements thinkForIt(){

@Override
public void methodToThinkOn(){
return null; // i thought about it but i do not need to do anyting!

}

If the interface thinkForIt would have any annotations like @required, users could get warning or error if they did not implement it...

Looking for a solution and thanks for your comments in advance!

question from:https://stackoverflow.com/questions/65835744/is-it-possible-to-create-necessary-required-interfaces

Answer 1

Your overall design is questionable; you are reinventing security code, which is always a red flag. Use Spring Security instead.

However, there's a simple way to ensure that "some bean of type Foo" has been registered with the context:

@Component
@RequiredArgsConstructor
public class ContextConfigurationVerifier {
  final Foo required;
}