How to develop Akka Persistence Actors

Before diving into the development of Akka Persistence application, we will consider some steps on how to develop an Akka Persistence Actor, covering which components are important, which functions are required to provide implementation, how to interact with Journals, and so on.

Step1 – Use the PersistenceActor trait

If want to develop an Akka Persistence component or Actor, add the PersistenceActor trait to this Actor, as shown here:

class HelloWorldActor extends PersistentActor{ 
  // Actor State goes here 
  // Actor Operations goes here 
} 

Here, PersistentActor is a trait defined in the akka.persistence package. It marks our HelloWorldActor as a Persistence Actor.

Step2 – Implement PersistenceActor's receiveRecover

The next step is to provide an implementation for one of the important and mandatory functions (or methods) of PersistentActor trait—receiveRecover. It is defined with the following signature:

def receiveRecover: Receive

This function is also...