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0307c55f9f
To avoid having to either hard-code or manually configure service addresses (possibly several dozen), and to reduce the project's dependency on docker to deal with routing and discovery, the option to use [Zookeeper](https://zookeeper.apache.org/) to manage services and discovery has been added. A service registry interface was added, with a Zookeeper implementation and a basic implementation that only works on docker and hard-codes everything. The last remaining REST service, the assistant-service, has been migrated to gRPC. This also proved a good time to clear out primordial technical debt from the root of the codebase. The 'service-client' library has been taken behind the barn and given a last farewell. It's replaced by a small library for managing gRPC channels. Since it's no longer used by anything, RxJava has been removed as a dependency from the project. Although the current state seems reasonably stable, this is a work-in-progress commit.
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1.5 KiB
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);
// set up Spark endpoints here
}
}
Further the new service needs to be added to the ServiceId enum in service-discovery.