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  1. class SO52915280 {
  2.     public static void main(String[] args) throws Exception {
  3.         StringCommandBusRequest request = new StringCommandBusRequest();
  4.         CommandBus bus = new CommandBus();
  5.         String result = bus.execute(request);
  6.     }
  7.  
  8.     public interface Bus<P, B extends Bus<P, B>> {
  9.         <R, Q extends BusRequest<R, P, B>> R execute(Q request);
  10.     }
  11.  
  12.     public interface BusRequest<R, P, B extends Bus<P, B>> {
  13.     	P getPayload();
  14.     }
  15.  
  16.     public static class CommandBus implements Bus<CommandBusRequestPayload, CommandBus> {
  17.     	@Override
  18.     	public <R, Q extends BusRequest<R, CommandBusRequestPayload, CommandBus>> R execute(Q request) {
  19.     		CommandBusRequestPayload payload = request.getPayload();
  20.     		System.out.println("Got payload: " + payload);
  21.     	    return null;
  22.     	}
  23.     }
  24.  
  25.     public static abstract class CommandBusRequest<T> implements BusRequest<T, CommandBusRequestPayload, CommandBus> {
  26.         @Override
  27.         public CommandBusRequestPayload getPayload() {
  28.         	return new CommandBusRequestPayload();
  29.         }
  30.     }
  31.  
  32.     public static class CommandBusRequestPayload {}
  33.  
  34.     public static class StringCommandBusRequest extends CommandBusRequest<String> {}
  35. }
Success #stdin #stdout 0.08s 2184192KB
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Standard input is empty
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Got payload: SO52915280$CommandBusRequestPayload@45ee12a7
https://ideone.com/2aUwMW
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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