Published in TechTalks@Vattenfall·May 27, 20216 Things I Learned at VattenfallA few years back, I was thinking about myself as a highly skilled software developer, which is underestimated and works below his qualifications. I decided to change company and started to work for Vattenfall IT Services Poland, and I could not be more wrong about my skills. In this article…Software Development7 min readSoftware Development7 min read
Published in TechTalks@Vattenfall·Feb 2, 2021Tell, Don’t Ask — Learn to Talk to Your ObjectsModifying data in a class where they reside is always a good thing. The Tell Don’t Ask principle guides us on how to follow such an approach. Unfortunately, it is widespread to obtain data from object and process it inside some service or manager class. After this article, you will…Oop6 min readOop6 min read
Published in TechTalks@Vattenfall·Dec 23, 2020The Law of Demeter by ExampleWorking with modular software is something that not all of us can be blessed with. The code that is properly isolated and hidden behind abstraction seems to be a unicorn, that we heard about, but didn’t see it. Even if you did not see it, there is no argument not…Oop7 min readOop7 min read
Published in TechTalks@Vattenfall·Oct 19, 2020The OOP Has Been Explained Wrongly to MeObject-Oriented Programming is a paradigm that instructs us, how to organize data and function into objects. Those objects are structures that should be designed to reflect the real-world object. Fortunately, we have four principles defined: abstraction, polymorphism, inheritance, and encapsulation, which will lead us towards good code quality. Unfortunately, for…Programming14 min readProgramming14 min read
Published in TechTalks@Vattenfall·Jun 24, 2020Carving Out Read Models From The ApplicationImagine designing a new part of the application for a business that is not well defined yet. After a few knowledge-crushing sessions, you see the first boundaries of the new model and start to know how the business is running. Together with the team, you are making proof of concept…Software Development9 min readSoftware Development9 min read
Published in TechTalks@Vattenfall·Mar 23, 2020Why Should You Return HTTP 422?Developers are lazy. While reviewing an API, I’ve seen a lot of cases, that the only response codes returned were 500 (aka “backend is not working”) and 400 (broadly known as “frontend messed up”). “Better” APIs were also returning 404 and authentication/authorization failure codes. Such an approach is fast to…Programming5 min readProgramming5 min read
Published in TechTalks@Vattenfall·Mar 6, 2020Optimise Testcontainers For Better Tests PerformanceTesting an application during development should be something that is not disturbing our work but supporting it. Having a clear distinction between fast unit tests, and complex, but slower integration tests is a good start for achieving a quick feedback loop. The faster we will get a result of the…Java8 min readJava8 min read
Published in TechTalks@Vattenfall·Feb 4, 2020Introduce Any Testcontainer Into Your Spring ApplicationTestcontainers are powerful library that allows you to reproduce production environment on every developer’s computer with Docker containers. It reduces time needed for setting up environment and guarantees that everyone uses the same configuration, reducing number of potential points of failure. Integrating Testcontainers into existing application can be painful due…Java6 min readJava6 min read
