About Adam Warski

Adam is one of the co-founders of SoftwareMill, a company specialising in delivering customised software solutions. He is also involved in open-source projects, as a founder, lead developer or contributor to: Hibernate Envers, a Hibernate core module, which provides entity versioning/auditing capabilities; ElasticMQ, an SQS-compatible messaging server written in Scala; Veripacks, a tool to specify and verify inter-package dependencies, and others.

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Big data: when single node is better than clustered

There’s a lot of hype about “big data” and a general trend to try to apply Hadoop to almost every problem. However, sometimes it turns out that you can get much better results by writing an old-fashioned, but optimised, sing ...
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Using Scala traits as modules, or the “Thin Cake” Pattern

I would like to describe a pure-Scala approach to modularity that we are successfully using in a couple of our Scala projects. But let’s start with how we do Dependency Injection (see also my other blogs). Each class can have de ...
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Using JavaCV with Scala and SBT

Recently I’ve been doing some simple face detection in a Scala-based project. The “industry standard” for such kind of tasks is OpenCV; face detection is one of its basic use-cases.             ...
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How do iBeacons work?

iBeacons are certainly a trending topic recently. They allow indoor positioning, letting your phone know that you are in range of a beacon. This can have many applications: from helping you to find your car in a parking garage, th ...
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Amazon Elastic Map Reduce to compute recommendations with Apache Mahout

Apache Mahout is a “scalable machine learning library” which, among others, contains implementations of various single-node and distributed recommendation algorithms. In my last blog post I described how to implement an on-lin ...
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Creating an on-line recommender system with Apache Mahout

Recently we’ve been implementing a recommender system for Yap.TV: you can see it in action after installing the app and going to the “Just for you” tab. We’re using Apache Mahout as the base for doing recommendations. Maho ...
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Automatic generation of delegate methods with Macro Annotations

Macro Annotations are a new type of macros, which are one of the candidates for inclusion (see also comment by Eugene below) in the upcoming Scala 2.11 release. However, thanks to the recently released Macro Paradise Scala 2.10 co ...
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Akka vs Storm

I was recently working a bit with Twitter’s Storm, and it got me wondering, how does it compare to another high-performance, concurrent-data-processing framework, Akka. What’s Akka and Storm? Let’s start with a short descrip ...
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ElasticMQ 0.7.0: long polling, non-blocking implementation using Akka and Spray

ElasticMQ 0.7.0, a message queueing system with an actor-based Scala and Amazon SQS-compatible interfaces, was just released. It is a major rewrite, using Akka actors at the core and Spray for the REST layer. So far only the core ...
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Typed ask for Akka

Akka is a great tool for writing distributed applications. One thing that always surprised me though is that while being based on Scala, which is a very type-safe language, the elementary construct in Akka – an actor – is not ...
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