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

This example Akka source code file (PersistentActorFailureExample.java) 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

abstractpersistentactor, actor, actorsystem, akka, arraylist, boxedunit, exception, japi, override, partialfunction, persistence, receivebuilder, runtime, runtimeexception, string

The PersistentActorFailureExample.java Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */

package sample.persistence;

import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import akka.japi.pf.ReceiveBuilder;
import akka.persistence.AbstractPersistentActor;
import scala.PartialFunction;
import scala.runtime.BoxedUnit;

import java.util.ArrayList;

public class PersistentActorFailureExample {
  public static class ExamplePersistentActor extends AbstractPersistentActor {
    private ArrayList<Object> received = new ArrayList<Object>();

    @Override
    public String persistenceId() { return "sample-id-2"; }

    @Override
    public PartialFunction<Object, BoxedUnit> receiveCommand() {
      return ReceiveBuilder.
        match(String.class, s -> s.equals("boom"), s -> {throw new RuntimeException("boom");}).
        match(String.class, s -> s.equals("print"), s -> System.out.println("received " + received)).
        match(String.class, s -> {
          persist(s, evt -> {
            received.add(evt);
          });
        }).
        build();
    }

    @Override
    public PartialFunction<Object, BoxedUnit> receiveRecover() {
      return ReceiveBuilder.
        match(String.class, s -> received.add(s)).
        build();
    }


  }

  public static void main(String... args) throws Exception {
    final ActorSystem system = ActorSystem.create("example");
    final ActorRef persistentActor = system.actorOf(Props.create(ExamplePersistentActor.class), "persistentActor-2");

    persistentActor.tell("a", null);
    persistentActor.tell("print", null);
    persistentActor.tell("boom", null);
    persistentActor.tell("print", null);
    persistentActor.tell("b", null);
    persistentActor.tell("print", null);
    persistentActor.tell("c", null);
    persistentActor.tell("print", null);

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

    // received [a]
    // received [a, b]
    // received [a, b, c]

    // Will print in a second run:

    // received [a, b, c, a]
    // received [a, b, c, a, b]
    // received [a, b, c, a, b, c]

    // etc ...

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