CQRS/Event Sourcing System Example by using Akka

This is a example for CQRS+ES(Event Sourcing).

Concepts

• DDD-based: The Write API Server has aggregate actors in the domain module.
• CQRS+ES(Event Sourcing): The Write API Server supports the Command side, The Read API Server supports the Query side.

Status

• WIP

• Scala 2.13.8

  • Write API Server is DONE
  • Read Model Updater is DONE
  • Read API Server is DONE

• Kotlin 1.6.21

  • Write API Server is DONE
  • Read Model Updater is TODO
  • Read API Server is TODO

• Java 17

  • Write API Server is WIP
  • Read Model Updater is TODO
  • Read API Server is TODO

Note: Akka is implemented in Scala, so even if you use Kotlin or Java, you may need to implement Scala in some parts of your application.

Updates

• Modified JDK version from temurin-11 to temurin-17, need to set --enable-preview in the environment variable JAVA_OPTS(export JAVA_OPTS='--enable-prewview').

Architecture

Project Layout

This project is divided into the following parts. For example, if you want to read Scala code, read the code under common, scala.

• common
• scala
• kotlin
• java

Main Framework/Library

• Akka
  • "com.typesafe.akka" %% "akka-actor-typed"
  • "com.typesafe.akka" %% "akka-cluster-typed"
  • "com.typesafe.akka" %% "akka-cluster-sharding-typed"
  • "com.typesafe.akka" %% "akka-persistence-typed"
  • "com.typesafe.akka" %% "akka-http"
  • "com.lightbend.akka.management" %% "akka-management"
  • "com.lightbend.akka.management" %% "akka-management-cluster-bootstrap"
  • "com.lightbend.akka.discovery" %% "akka-discovery-kubernetes-api"
  • "com.github.j5ik2o" %% "akka-persistence-dynamodb-journal-v2"
  • "com.github.j5ik2o" %% "akka-persistence-dynamodb-snapshot-v2"
• ULID
  • "org.wvlet.airframe" %% "airframe-ulid"

Scala

• DI Container
  • "org.wvlet.airframe" %% "airframe"

Kotiln

• DI Container
  • "org.kodein.di" % "kodein-di-jvm"
• FP
  • "io.arrow-kt" % "arrow-core"
• Collection Library
  • "io.vavr" % "vavr-kotlin"

Java

• DI Container
  • "org.springframework.boot" % "spring-boot-starter"
• Collection Library
  • "io.vavr" % "vavr"

The Tools Installation

Debug on Local Environment

Debug on Local Machine

Debug on Docker Compose

Deploy to Local Kubernetes(on Docker for Mac)

Deploy to Minikube

AWS Deployment

AWS Setup

Deploy to EKS