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Declarative HTTP API Testing with gabbi

While HTTP APIs are ubiquitous these days, testing and documenting such APIs remains somewhat awkward: Tests usually consist of procedural code that is specific to the respective language or even framework - which is neither very expressive nor easy to maintain.

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A day full of Clojure - organizing the first German ClojureBridge workshop

During the last years a lot of initiatives focusing on increasing diversity in IT and getting kids into IT have emerged. Last weekend the first German ClojureBridge workshop took place in Solingen. Another small but important step towards a diverse IT world.

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Per request debugging with Log4j 2 filters

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What’s in a Name: Reactive

The term reactivity is overloaded with several different meanings. This post tries to identify and clarify a few of them…

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Using Vector Assets on iOS

Vector graphics provide numerous advantages, especially when developing for mobile devices in a constantly expanding array of different screen sizes and pixel ratios. How to get them to work in an iOS app?

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Functional Validation in Scala

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Why You Should Avoid a Canonical Data Model

As an enterprise architect, you might be tempted to strive for a canonical data model for your systems’ interfaces. That’s not a good idea.

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Docker images for developers

Docker seems to be all the rage lately. There are docker talks at every conference, hosting Docker containers has become a hosting option with most if not all PaaS providers, and there is hardly a technology left that is not supposed to run better and more flexibly if you wrap it in a Docker container. Well, except maybe for enterprise-level DBMSs, but you can’t have them all. This post provides an example how Docker can be used at the start of the software lifecycle, during development.

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Scalable Software Systems

From developer laptops to server farms

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Hystrix – to make your fuse blow just in time

Circuit breakers were originally introduced to prevent the escalation of an outage. If your fuse blows occasionally, that does not have to be a bad thing - at least if it is a circuit breaker in the sense of Hystrix. In this article we will introduce you to Hystrix, a library which will help you to increase the stability of your distrubted applications and which will help to prevent cascading error scenarios.