# 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:

```java
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(SearchServiceDescriptors.descriptors, 
                        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:

```java
@Singleton
public class FoobarService extends Service {

    @Inject
    public FoobarService(BaseServiceParams params) {
        super(params);
        
        // set up Spark endpoints here
    }
}
```

Further the new service needs to be added to the `ServiceId` enum in [service-discovery](../service-discovery).

## Central Classes

* [MainClass](src/main/java/nu/marginalia/service/MainClass.java) bootstraps all executables
* [Service](src/main/java/nu/marginalia/service/server/Service.java) base class for all services.