Category: programming

ThreadLocal and ExecutorService

Recently I have been working on some code in which I was using ThreadLocal variables. This give me possibility to chew over the ThreadLocal variables concept again. The basic idea of this approach is quite simple. Every thread has its own copy of a ThreadLocalMap. When you ask for the value of the ThreadLocal variable…

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Private blockchains – possible FinTech implementations and challenges

We’ve recently had a spike in our sprint to check out blockchain technology. The goal was to assess it and check potential use in our FinTech scenarios rather than implement anything. We obviously started with bitcoin – blockchain’s No 1 implementation. There are many resources on the Web explaining how it works (starting with their WIKI). It requires some…

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Caching complex objects with Laravel 4.2 and Redis – part 1

Laravel supports various cache drivers out of the box. One of them is Redis. I am not going to describe Redis with it’s features and advantages here, it’s not the purpose of this document. The only important point in scope of this document is that Redis supports tags. Feel free to google a bit what…

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Automated server configuration and deployment with Ansible

In many cases configuring a new server is a repetitive task. Once the operating system is installed, we have to add accounts for administrators, install some basic packages, setup the application and secure everything. Even though there are some differences between servers designed for two different applications, certainly there will be some common things too. Especially…

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How PIZZA makes Poland’s programmers better

It was early Saturday morning when I entered the main lecture room at the Institute of Computer Science at the University of Wroclaw. Some of the 100 young people at the audience were still dozing, some pumping their veins with coffee, others immersed in their laptops. The oldest ones were in their thirties, some of…

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CSS variables

Every developer who has developed any webpage has the same problem: a change of primary color implies changes in many CSS files and careful find/replace operations for all occurrences of specific value. Some of us are already using CSS pre-compiler libraries (like Less), which allows us using variables on CSS level in our code. Less can…

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