flamme

import com.amadeus.flamme.runtime.annotations.Flamme;
import com.amadeus.flamme.runtime.annotations.FlammeImpl;
import com.google.protobuf.Message;
import com.google.protobuf.StringValue;
import jakarta.inject.Inject;
import java.util.Map;

@Flamme(
    serviceName = "greeter",
    multiPayloadKeys = {
        @Flamme.MultiPayloadKey(id = GreeterService.NAME_KEY, type = StringValue.class),
        @Flamme.MultiPayloadKey(id = GreeterService.GREETING_KEY, type = StringValue.class)
    }
)
public interface GreeterService {
    String NAME_KEY = "name";
    String GREETING_KEY = "greeting";

    Map<String, Message> sayHello(Map<String, Message> payload);
}

@FlammeImpl
class GreeterServiceImpl implements GreeterService {
    @Override
    public Map<String, Message> sayHello(Map<String, Message> payload) {
        StringValue name = (StringValue) payload.get(NAME_KEY);
        return Map.of(
            GREETING_KEY,
            StringValue.of("Hello, " + name.getValue() + "!")
        );
    }
}

class GreeterResource {
    @Inject
    GreeterService greeterService;

    String greet() {
        Map<String, Message> response = greeterService.sayHello(
            Map.of(GreeterService.NAME_KEY, StringValue.of("World"))
        );

        return ((StringValue) response.get(GreeterService.GREETING_KEY)).getValue();
    }
}