how to make a singleton and how to store state using services? in the AEM java code, you have filters, servlets and services.
services are defined like this:
@Component(service = SomeService.class)
public class SomeServiceImp implements SomeService {
Is this a singleton? can it store state (assume not)? Is it thread safe (assume not)?
Are there any tutorials out here? There are pages of information about OSGI architecture, how to manage lifecycles, bundleActivators, repositories etc, but little I can find about how services really work at the java business logic level.
1. How would you build a service which stores state, for a) the whole application, ob b) for a request?
E.g. a http request to a servlet which makes several calls to a services which need an auth token to make calls to a backend API. CAching of the auth token could be managed in the servlet, but this makes the servlet have to know about underlying implementation, and less secure. How would several independen
