Akka/Scala example source code file (PersistentActorFailureExample.scala)

This example Akka source code file (PersistentActorFailureExample.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

actor, actorsystem, akka, app, examplepersistentactor, exception, list, nil, persistence, persistentactor, persistentactorfailureexample, string

The PersistentActorFailureExample.scala Akka example source code

package sample.persistence

import akka.actor._
import akka.persistence._

object PersistentActorFailureExample extends App {
  class ExamplePersistentActor extends PersistentActor {
    override def persistenceId = "sample-id-2"

    var received: List[String] = Nil // state

    def receiveCommand: Actor.Receive = {
      case "print" => println(s"received ${received.reverse}")
      case "boom"  => throw new Exception("boom")
      case payload: String =>
        persist(payload) { p => received = p :: received }

    }

    def receiveRecover: Actor.Receive = {
      case s: String => received = s :: received
    }
  }

  val system = ActorSystem("example")
  val persistentActor = system.actorOf(Props(classOf[ExamplePersistentActor]), "persistentActor-2")

  persistentActor ! "a"
  persistentActor ! "print"
  persistentActor ! "boom" // restart and recovery
  persistentActor ! "print"
  persistentActor ! "b"
  persistentActor ! "print"
  persistentActor ! "c"
  persistentActor ! "print"

  // Will print in a first run (i.e. with empty journal):

  // received List(a)
  // received List(a, b)
  // received List(a, b, c)

  // Will print in a second run:

  // received List(a, b, c, a)
  // received List(a, b, c, a, b)
  // received List(a, b, c, a, b, c)

  // etc ...

  Thread.sleep(1000)
  system.shutdown()
}