MarginaliaSearch/code/common/service

Service

Contains the base classes for the services. This is where port configuration, and common endpoints are set up.

Creating a new Service

The minimal service needs a MainClass and a Service class.

For proper initiation, the main class should look like this:

public class FoobarMain extends MainClass {

    @Inject
    public FoobarMain(FoobarService service) {}

    public static void main(String... args) {
        init(ServiceId.Foobar, args);

        Injector injector = Guice.createInjector(
                new FoobarModule(), /* optional custom bindings go here */
                new DatabaseModule(),
                new ConfigurationModule(ServiceId.Foobar));

        injector.getInstance(FoobarMain.class);
        
        // set the service as ready so that delayed tasks can be started
        injector.getInstance(Initialization.class).setReady();
    }
}

A service class has a boilerplate set-up that looks like this:

@Singleton
public class FoobarService extends Service {

    @Inject
    public FoobarService(BaseServiceParams params) {
        super(params, List.of(/* grpc services */));
        
        // set up Spark endpoints here
    }
}

Further the new service needs to be added to the ServiceId enum in service-discovery.

Central Classes

• MainClass bootstraps all executables
• Service base class for all services.