Hi,
in the AKKA Doc on persistent actor, what is the purpose of <<notifying
others about successful state changes by publishing events>> in:
=>>The main responsibility of an event handler is changing persistent actor
state using event data and notifying others about successful state changes
by publishing events.
It is related to:
1. persist(Evt(s"${data}-${numEvents + 1}")) { event =>
2. updateState(event)
3. context.system.eventStream.publish(event)
4. }
A - What could be a possible use case for this ?
B - Could someone issue new *Command *in that call back ? let say to other
actor ?
C - Let say the Actor here is a ShoppingCard Actor and it communicate with
an Inventory Actor and a Credit CarProcessor Actor, Would they consumer
that event, to do their work ? synchronize their state ? Or shall they
receive new command ? What would be the best place to communicate with them
? That call back ? by sending command, or publishing the event, to the bus
as above.
Many thanks,
Maatari
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