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Of races and mutexes: synchronizing async operations in JavaScript
While JavaScript is a strictly single-threaded language, the asynchronous nature of its execution model can easily lead to situations in which two or more async operations run at the same time and compete with the program flow depending on which operation succeeds first. The result is a specimen of the dreaded species of race conditions.…
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Travel Your Project
As a traveler and project guy, I often noticed that these two important things in my life have a lot in common. Things that happen while I’m on the road are similar to situations I observe in my daily project business. When I struggle in a new or existing project I often think about similar situations I had on…
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From Vagrant to NixOps
I have been following the development of NixOps for some months. NixOps is a cloud deployment tool using nix, the functional package manager for unix systems. Nix makes it very intuitive to define absolute package dependencies. No more thinking and guessing about required runtime dependencies. NixOps supports deploying to different platforms. Bare-metal, cloud, and even virtual environments like virtualbox work…
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mobile dev hint #2 – Use Browsersync for mobile testing
While testing mobile websites on different devices and browsers, testing time grows exponentially. You need to duplicate click-through movements on all the devices, fill out forms many times and do all the user interaction for too many times. This is where Browsersync starts, it cuts out all the repetitive manual tasks. You can mirror all…
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mobile dev hint #1 – Remote Debugging Websites on iOS Devices
When it comes to mobile testing, we need to talk about testing on real devices. What seems to be an easy task for the tester, could be hard when you try to debug device specific errors on the device itself. This short guide will help you with the setup of the remote debugging with the Safari Developer…
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Hardening Compiler Flags for NixOS
In the past year some Mayflower colleagues have started using and contributing to NixOS, a purely functional GNU/Linux distribution that combines package and configuration management. We decided that we would give it a try in production but stumbled upon some issues that had to be resolved first. We have added new packages, services and fixed up some internal. Due…
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Do you know the difference between continuous integration, continuous delivery and continuous deployment?
Probably every common agile developer has heard these terms. But have you ever thought about the difference between them. I have really been wondering about this question and after some investigation I would like to share all information on this topic i have gathered. To be able to understand continuous deployment it can be helpful…
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Running a secure docker registry
Some time ago, our team decided to deploy the application which we are developing for our customer as a docker container. As docker is a promising but still very young technology, this decision naturally put us on a quest for finding a reliable, secure and maintainable setup — many things are still in flux in…
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Domain-specific languages for fixture generation – a case study with Antlr4
A domain-specific language (DSL) is a programming language or descriptive file format to formulate and solve specific problems in specific domains, as opposed to generic descriptive file formats (such as XML) and general-purpose programming languages (such as Java) which can be employed in any domain. A paradigmatic use case for a domain specific programming language…