com.netflix.eventbus.spi
Interface DynamicSubscriber

public interface DynamicSubscriber

Eventbus subscribers, by design, are statically tied to a particular type of object i.e. the class of the event it is interested in. This in most cases is beneficial and easy to use, however, in some cases (typically event agnostic, middlemen, which stores the event for later investigation), the event processing is much the same irrespective of the type of event it receives. In such a case, it will be an overhead (even if possible) to define a subscriber for each kind of event existing in the system.
This special subscriber is a way to achieve dynamic interests (immutable after registration) in subscribers. Although, this subscriber can only listen to one type of event but the type is defined at runtime as opposed to compile time in a normal subscriber.
Although, this subscriber does not mandate that the subscriber must have a subscribe method (one annotated with Subscribe) listening to event type Object but in most of the cases, such a subscribe method will prove to be more useful. EventBus allows specifying the subscribe method with argument Object only for these subscribers.
Implementations must only have a single subscriber method or else the registration with eventbus will be rejected. This limitation is imposed as we do not want to make runtime decisions on which subscribe method an event must be directed to.

Method Summary

java.lang.Class<?>

getEventType() Returns the event type i.e.

Method Detail

getEventType

java.lang.Class<?> getEventType()

Returns the event type i.e. the class of the event that this subscriber will be interested in.
EventBus allows specifying the subscribe method with argument Object only for these subscribers.
The implementers of this interface must make sure that the subscribe method accepts the event class returned by this method.

Returns:

The event type i.e. the class of the event that this subscriber will be interested in.