Say Hello

In previous article our Planet is capable of constructing a greeting message. This article shows how to make it possible for a client application to say hello to the Planet.



Alternative video format (mpg)

Let us create a PlanetService to expose the sayHello method to clients. We lookup the Planet from its name using the built in findByKey repository operation. In Sculptor model file this looks like this:

      Service PlanetService {
         String sayHello(String planetName) throws PlanetNotFoundException;
     }

     Entity Planet {
         gap
         scaffold
         String name key
         Long population min="0"
         Long diameter min="0" nullable
         -Set<@Moon> moons opposite planet
      
         Repository PlanetRepository {
             findByKey;
         }
     }

All hand written java code we need to add is for testing and two trivial lines in PlanetServiceImpl:

    public String sayHello(ServiceContext ctx, String planetName)
       throws PlanetNotFoundException {

       Planet planet = getPlanetRepository().findByKey(planetName);
       return planet.greeting();
   }