Producing an AxonDBEventStore with AxonFramework CDI

Imported from Google Groups
1

Hi,

I was wondering if anyone has already been able to produce an AxonDBEventStore with AxonFramework CDI.
At the moment I have the following producer:

@Produces
@Singleton
public EventBus eventStore(AxonDBConfiguration axonDBConfiguration, Serializer serializer, @Any Instance upcasters)
{
EventUpcasterChain eventUpcasterChain = new EventUpcasterChain(Streams.stream(upcasters.iterator()).collect(Collectors.toList()));
AxonDBEventStore axonDBEventStore = new AxonDBEventStore(axonDBConfiguration, serializer, eventUpcasterChain);
axonDBEventStore.registerDispatchInterceptor(new AddSourceDispatchInterceptorImpl());
return axonDBEventStore;
}

But changing the return type to AxonDBEventStore gives the following error:

org.jboss.weld.exceptions.DeploymentException: WELD-001409: Ambiguous dependencies for type EventBus with qualifiers @Default
at injection point [BackedAnnotatedField] @Inject private com.brutex.health.AxonDBTrackingProcessorHealthCheck.eventBus
at com.brutex.health.AxonDBTrackingProcessorHealthCheck.eventBus(AxonDBTrackingProcessorHealthCheck.java:0)
Possible dependencies:

  • org.axonframework.cdi.BeanWrapper@174e5016,
  • Producer Method [AxonDBEventStore] with qualifiers [@Any @Default] declared as [[BackedAnnotatedMethod] @Produces @Singleton public com.brutex.axon.AxonConfiguration.eventStore(AxonDBConfiguration, Serializer, @Any Instance)]

I don’t understand why it’s perfectly fine to produce an EventBus but producing an AxonDBEventStore leads to ambiguous dependencies. Can anyone shed some light on this?

Regards,
Jens

2

Hi Jens,

the CDI module is still in alpha phase. My hunch is that either the cdi module, or cdi itself isn’t flexible enough, in this case.
The CDI module has a listener of a ProcessProducer<T, EventBus>, which according to the documentation is reports producers that declare a returntype of EventBus. It is unclear to me whether that would mean a producer of a subtype should also be included. Given your issue, I guess it doesn’t.

So I’m afraid that with the current state of the CDI module, you’d need to declare a @Producer of EventBus.

Kind regards,

Allard