How to use Guava ServiceManager with Guice Injection

Question

As mentioned here, Guava ServiceManager can be obtained by

ServiceManager manager = injector.getInstance(ServiceManager.class);

To make this work, I added the following in my Guice module:

@Provides
public Set<Service> services(){
    return ImmutableSet.<Service>of(MyService());
}

In my main class,

ServiceManager manager = injector.getInstance(ServiceManager.class);
manager.startAsync().awaitHealthy();

How do I get instances of the started services?

p.s. Setting the services to be @Singleton feels like a hack.

Answer 1

In my opinion, setting the services to be @Singleton isn't a hack at all. That's probably what I'd do.

@Provides @Singleton
public MyService myService() {
  return new MyService();
}

@Provides
public Set<Service> services(MyService myService) {
  return ImmutableSet.<Service>of(myService);
}

Then you can just inject any particular service instance you want anywhere you want.

Answer 2

ServiceManager.getServicesByState().get(RUNNING) returns the running services and ServiceManager.getServicesByState().values() returns all of the services managed by the ServiceManager.