IntelliJ IDEA OS X Shortcuts on Ubuntu Gnome

I recently got myself a new desktop computer with nice and fast hardware (more about this in another post) and am setting up Ubuntu Gnome on it. Since I’ll still be using my MacBook Pro for some time I don’t want to learn another set of keyboard shortcuts, so I set out to use IDEA’s OS X 10.5+ keyboard bindings … Read More

Akka anti-patterns: being out of touch with the hardware

Choosing Akka as a tool is often – if not always – driven by the need for good performance. Surely, the actor model itself is appealing as a means for organizing and reasoning about code, but this isn’t in itself a good reason enough to use the Akka toolkit. If all you are concerned about is a nice way to … Read More

Akka anti-patterns: logging (the wrong way)

Update: removed rogue toString call in the second code example, since it was unnecessary (and harmful). Debugging actor systems is no small feat, even when there is IDE support for it. In fact, debugging any asynchronous system for that matter is a rather complicated task. Which is why, especially during development, it is not entirely uncommon to rely on DEBUG … Read More

Akka anti-patterns: too many actor systems

Admittedly I’ve seen this one in use only one time, but it was one time too many. For some reason I keep seeing clients come up with this during design discussions and reviews though, therefore it makes it into the list of Akka anti-patterns. What I am talking about is this: Reasons I hear for this design: isolation of concerns: … Read More

Akka anti-patterns: race conditions

The actor model makes it possible to build highly-concurrent applications through the notion that actors obey the actor send rule and the actor subsequent processing rule, hence creating a single-threaded environment inside of an actor. That being said, it’s all an illusion: as we have briefly talked about previously, Akka’s dispatchers make sure that messages are being processed by actors … Read More

Akka anti-patterns: shared mutable state

When I work with clients on designing actor systems there are a few anti-patterns that seem to make it into initial, non-reviewed designs no matter what. In this series of short articles I would like to cover a few of those. Anti-pattern #1: sharing mutable state accross actors Even though the Akka documentation points this out in various places, one … Read More

The reality of writing a technical book

Two days ago I received my copies of Reactive Web Applications. Needless to say, I had been waiting for this moment for some time. Even though the final PDF version had been out for a few weeks prior to this, nothing compares to holding in your hands an actual, physical, printed book and seeing the pages you’ve been working on … Read More

The microservices marathon

Everyone is talking about microservices. And many people are betting on it. At this year’s Voxxed Days Vienna over 60% of the submissions contained the word microservices. At JAX 2016 in Mainz, the word microservices was spoken out aloud on average 40 times per minute accross the entire venue. It’s hard to go one day on Twitter without seeing microservices … Read More

Akka Cluster, Java and the Raspberry PI 3 Model B

I recently built an architecture prototype for DIMOCO aiming at answering roughly the following questions: what does it entail to run an Akka cluster, how fast can new nodes join, how manageable is such a cluster? are traditional publish-subscribe message distribution semantics supported (one-to-one, one-to-N, one-to-any-of-N)? how can message loss be averted / minimized? how fast is the message sending, … Read More