jboner

VS Code Plugins and configuration tips

https://code.visualstudio.com/docs/setup/setup-overview

Plugins

• Project manager https://marketplace.visualstudio.com/items?itemName=alefragnani.project-manager
• Scala metals https://marketplace.visualstudio.com/items?itemName=scalameta.metals

jboner

package sample.eventdriven.scala

import akka.actor.{Actor, ActorRef, ActorSystem, Inbox, Props}
import akka.persistence.PersistentActor

import scala.concurrent.ExecutionContext.Implicits._
import scala.concurrent.duration._

// ===============================================================
// Demo of an Event-driven Architecture in Akka and Scala.

jboner

package sample.eventdriven.java;

import akka.actor.*;
import akka.persistence.AbstractPersistentActor;
import scala.concurrent.duration.Duration;

import java.io.Serializable;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

jboner

References from my talk 'Without Resilience, Nothing Else Matters'

• Drift into Failure
• How Complex Systems Fail
• Antifragile: Things That Gain from Disorder
• Leverage Points: Places to Intervene in a System
• Going Solid: A Model of System Dynamics and Consequences for Patient Safety
• Resilience in Complex Adaptive Systems: Operating at the Edge of Failure
• Puppies! Now that I’ve got your attention, Complexity Theory
• [Towards Resilient Architectures: Biology

jboner

import akka.actor.SupervisorStrategy._
import akka.actor._
import akka.persistence.PersistentActor
import scala.concurrent.duration._

// Coffee types
trait CoffeeType
case object BlackCoffee extends CoffeeType
case object Latte extends CoffeeType
case object Espresso extends CoffeeType

jboner

import akka.actor._
import akka.actor.SupervisorStrategy._
import scala.concurrent.duration._

// Coffee types
trait CoffeeType
case object BlackCoffee extends CoffeeType
case object Latte extends CoffeeType
case object Espresso extends CoffeeType

jboner

Keybase proof

I hereby claim:

• I am jboner on github.
• I am jonas (https://keybase.io/jonas) on keybase.
• I have a public key ASB-dCL3b2wk3TzgiVeoHmmp_s-ZM004MVmlztARjGu-pAo

To claim this, I am signing this object:

jboner

package demo

import akka.actor.{Actor, Props, ActorSystem}

object PingPong extends App {
  case object Ball

  class Ping extends Actor {
    var counter = 0

jboner

package demo

import akka.actor.{Props, ActorSystem}
import akka.persistence.PersistentActor

object PingPong extends App {
  case object Ball         // The Command
  case object BallReceived // The Domain Event, represents a Fact, something that have already happened

  class Ping extends PersistentActor {

jboner

# How Akka maps to EAI Patterns

Might be up for debate or just plain wrong. Just some notes I scribbled down some time ago. 

-----------------------------------------------------------------------------------------------------------------
EAI PATTERN                     AKKA PATTERN                  REFERENCE
-----------------------------------------------------------------------------------------------------------------
Point to Point Channel          Regular Actor Communication   http://www.eaipatterns.com/PointToPointChannel.html
Event-Driven Consumer           Regular Actor Receive         http://www.eaipatterns.com/EventDrivenConsumer.html
Message Selector                Actor with Stash              http://www.eaipatterns.com/MessageSelector.html