In the process of rewriting the deprecated persistentView in Akka, I have a read actor that needs to snapshot its state and the journal events offset is has read so far. To stop the view actor requ...

Among the different options of a write-journal to implement Event Sourcing, Kafka seems a very reasonable choice from "outside": It has a great ecosystem It is well documented It naturally ...

I am developing an application that uses Akka, in which Actors are designed to avoid the Request-Response pattern. Using the Extra or the Cameo pattern is possible to model interactions among actor...

I'm trying to implement read side in my ES-CQRS architecture. Let's say I have a persistent actor like this: object UserWrite { sealed trait UserEvent sealed trait State case object Uninitiali...

I am completely new to the lagom framework, hence, i was reading the documentation today and started modifying their hello world example. However, i am unable to find a way to fetch all persisted ...

We are currently doing some research about CQRS and Event Sourcing and found two major frameworks taking care of these two concerns: Axon Framework and Eventuate. Both are continuesly developed, wh...

Is there a good way of doing CQRS when combined with Event Sourcing? One way I thought about was doing this in the Command handler (of a Persistent Actor) as soon as the Command was turned into a...

I was looking at post's on querying in application designed with approach Event Sourcing/DDD/CQRS. As I understand events are changes to the state of a domain object. The changes to state will be ...

PersistentView has been deprecated in akka 2.4. The docs advise to switch to PersistenceQuery instead. However PersistenceQuery seems to be limited to the event journal only, without a capability t...

I'm in mess about the applicability of Akka Persistence, and the persistent actors, when I should use a persistent Actor? Taking for example from a Cart module of a given Shopping Application, wil...

I want to use akka-persistence event sourcing feature in order to implement CRQS + Event Sourcing idea in my new project. The problem is that besides the documentation (http://doc.akka.io/docs/akka...

I am designing a backend using CQRS + Event sourcing, using Akka + Scala. I am not sure about how to handle a growing state. For instance, I will have a growing list of users. To my understanding, ...

I'm working on a project that's based on Akka Persistent FSM. In particular: I want to know what the best way is to structure test cases for independence? Since state changes are persisted (this ...

I have been playing around with Akka Persistence and have written the following program to test my understanding. The problem is that I get different results each time I run this program. The corre...

I'm using the scala api for akka-persistence to persist a group of actor instances that are organized into a tree. Each node in the tree is a persistent actor and is named based on the path to that...

Is there any way to combine akka 2.3 and play 2.2? For now I'm getting AbstractMethodError while running such application. I need to have them both in one app because Akka 2.3 comes with very usefu...

Any idea why I am getting the following error after adding Akka to my library dependencies and executing the test task? Uncaught error from thread [reactivemongo-akka.actor.default-dispatcher-4] s...