Integrate Actors APIs with Spring

[salaboy]

Integrating the Actors API with Spring should follow the same approach as Workflows.
For example:

• Actor registration should happen when the Spring Boot application context load, it shouldn't be done by the user. -> For example: ActorRuntime.getInstance().registerActor(DemoActorImpl.class); -> Provide @EnableDaprActors annotation.
• All ActorRuntime configuration options should be handled by Spring properties. For example: ActorRuntime.getInstance().getConfig().setDrainOngoingCallTimeout(Duration.ofSeconds(10));
• Investigate how to handle annotations @ActorType and @ActorMethod. Right now actors need to extend AbstractActor, but these are not managed Spring beans, making it difficult to integrate with the ecosystem.
  • It would be great to not need to extends AbstractActor as this can be automatically done by the framework.
  • For state manager -> super.getActorStateManager().set("lastmessage", something).block(); it would be great to have access by using Spring @Autowired in the Actor implementation.

The current approach push the user to define an interface annotated with @ActorType and @ActorMethod and then an implementation with the logic. Next create an implementation class that must extend AbstractActor. For a better developer experience, the framework (Spring integration) can collapse this steps into a single annotated implementation class.

This will require some investigation to common use cases and patterns about how users define their actors.

Check also: https://github.com/dapr/java-sdk/tree/master/sdk-tests/src/test/java/io/dapr/it/actors/services/springboot

References:

• https://www.baeldung.com/akka-with-spring#4-retrieving-spring-wired-actors
• https://dev.to/seonwoo960000/bringing-the-actor-model-to-spring-boot-with-pekko-4ffb