Akka · Akka Cluster

Background Processing with Akka Cluster: ClusterSingletonManager

REST services are quite commonly used in scalable architectures because they are stateless. However, in the practical world, a service is rarely just a CRUD service: for example we could also have some background processing (i.e.: downloading/parsing files, scheduled processed, triggers, etc). In this tutorial we demonstrate how to use an Akka SingletonClusterManager in a… Continue reading Background Processing with Akka Cluster: ClusterSingletonManager

Akka · Tutorial

Peer-to-Many Communication in Akka

The most common communication channel in Akka is Peer-to-Peer, where an individual actor sends a message directly to another individual actor actor. However, sometimes this is not enough as we may need a Peer-to-Many type of communication, where an individual actor sends a message to a group of actors. This is particularly useful when you… Continue reading Peer-to-Many Communication in Akka

Akka · Tutorial

How to Integrate ReactiveMongo in your Akka Spray Application

Scalability can be challenging when database access is needed: the common approach is to block the thread until a response is received. ReactiveMongo is a MongoDB Scala Driver that provides fully non-blocking asynchronous I/O operation that increases the scalability of your system. In a previous post we have seen how to build a REST Api… Continue reading How to Integrate ReactiveMongo in your Akka Spray Application

Akka · Testing · Tutorial

How to test Actors with Akka TestKit and Spec2

Actors are a really powerful tool to handle concurrency thanks to their message-based model. However, they can be tricky to test: sending and processing messages is done asynchronously. Moreover, their status is hidden internally and it cannot be easily accessed to make assertions on it. The Akka Team has created a library, called akka-testkit, to… Continue reading How to test Actors with Akka TestKit and Spec2

Akka · REST · Spray · Tutorial

How to build a REST api with Spray and Akka

Spray is a library written on top of Akka and Scala that allows to quickly create REST interfaces. It is becoming more and more popular in the Scala community because it is easy to use and performant thanks to this asynchronous, actor-based model. This article describes how to efficiently exploit Spray to create a simple… Continue reading How to build a REST api with Spray and Akka