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Tag Archives: Akka

Reactive file system monitoring using Akka actors

In this article, we will discuss: File system monitoring using Java NIO.2 Common pitfalls of the default Java library Design a simple thread-based file system monitor Use the above to design a reactive file system monitor using the actor model Note: Although all the code samples here are in Scala, it can be rewritten in simple Java too. To quickly ...

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Testing AKKA application with Spock

AKKA is message-driven and actor model based concurrency toolkit. Although it’s written in Scala, AKKA can be used in any JVM based language project. This post tries to fill the gap of missing information about writing good tests in polyglot JVM projects that leverage AKKA framework. In multi language JVM projects my obvious choice of testing tool is Spock. Powered ...

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Akka Typed Actors: Exploring the receptionist pattern

In this article we’ll explore another of Akka-Typed patterns. This time we’ll show you how you can use the receptionist patterns. This is the third and last article on a series on Akka-Typed. The other two articles can also be found on this site. If you don’t know anything about Akka-Typed yet, it’s a good idea to first read the ...

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Akka Typed Actors: Exploring the receiver pattern

In the previous article we looked at some of the basic features provided by Akka Typed. In this article and the next one we’ll look a bit closer at some more features and do that by looking at the two different patterns provided by Akka Typed: the Receiver and the Receptionist pattern. If you’re new to Akka Typed, it might ...

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Akka Typed: First steps with typed actors in Scala

With the [release of Akka 2.4.0| http://akka.io/news/] a couple of weeks ago the experimental Akka Typed module was added. With Akka Typed it is possible to create and interact with Actors in a type safe manner. So instead of just sending messages to an untyped Actor, with Akka Typed we can add compile time type checking to our Actor interactions. ...

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Divided We Win: an event sourcing / CQRS prospective on write and read models separation. Commands and Events.

In today’s post we are going to unveil some very interesting (in my opinion) architecture styles: event sourcing and command query responsibility segregation (CQRS). Essentially, in both of them events are in the heart of the system design and reflect any changes of the state which are happening. It is quite different from the traditional CRUD architecture where usually only ...

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Backpressure in action with websockets and akka-streams

So in the previous article I showed how you could create a websocket server using akka-streams. In this follow up article we’ll look a bit closer on how backpressure works with websockets (and probably any TCP based protocol on top of akka). To show you this we’ll use the same setup as we did in the article on visualizing backpressure. ...

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Akka samples with scala and Spring

I was looking around recently for Akka samples with Spring and found a starter project which appeared to fit the bill well. The project however utilizes Spring-Scala which is an excellent project, but is no longer maintained. So I wanted to update the sample to use core Spring java libraries instead. So here is an attempt on a fork of ...

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Quasar and Akka – a Comparison

The actor model is a design pattern for fault-tolerant and highly scalable systems. Actors are independent worker-modules that communicate with other actors only through message-passing, can fail in isolation from other actors but can monitor other actors for failure and take some recovery measures when that happens. Actors are simple, isolated yet coordinated, concurrent workers. Actor-based design brings many benefits:     ...

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