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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.
54 lines
1.5 KiB
Markdown
54 lines
1.5 KiB
Markdown
# Service
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Contains the base classes for the services. This is where port configuration,
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and common endpoints are set up.
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## Creating a new Service
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The minimal service needs a `MainClass` and a `Service` class.
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For proper initiation, the main class should look like this:
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```java
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public class FoobarMain extends MainClass {
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@Inject
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public FoobarMain(FoobarService service) {}
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public static void main(String... args) {
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init(ServiceId.Foobar, args);
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Injector injector = Guice.createInjector(
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new FoobarModule(), /* optional custom bindings go here */
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new DatabaseModule(),
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new ConfigurationModule(ServiceId.Foobar));
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injector.getInstance(FoobarMain.class);
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// set the service as ready so that delayed tasks can be started
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injector.getInstance(Initialization.class).setReady();
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}
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}
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```
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A service class has a boilerplate set-up that looks like this:
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```java
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@Singleton
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public class FoobarService extends Service {
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@Inject
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public FoobarService(BaseServiceParams params) {
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super(params);
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// set up Spark endpoints here
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}
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}
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```
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Further the new service needs to be added to the `ServiceId` enum in [service-discovery](../service-discovery).
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## Central Classes
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* [MainClass](src/main/java/nu/marginalia/service/MainClass.java) bootstraps all executables
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* [Service](src/main/java/nu/marginalia/service/server/Service.java) base class for all services. |