Pseudo Data Structure for Strava and Komoot

Strava and Komoot can be used to plan bicycle trips and to record them. Both tools can be used for both purposes, but it seems that Strava is better for the recording and Komoot better for the planning. Btw. it works also for walking or running, for example. But I will stick with the bicycle …

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Unit and Integration Test with Databases

From an ideological point of view, tests that involve the database may be unit tests are may be integration tests. For many applications the functional logic is quite trivial, so it is quite pointless to write „real unit tests“ that work without the database. Or it may be useful. But there is a category of …

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Addresses

Postal addresses seem to be easy: – Name and/or Company – Street and/or PostBox – ZIP Code – Municipality – Country This is true in Germany or Switzerland and a few other countries. I would like to add, that in some large buildings it can be a good idea to add the apartment number, but …

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Devoxx UA 2020 (talks)

I watched the conference onlie and picked the following talks: The Effective Developer – Work Smarter, Not Harder by Sven Peters Polyglot, Fault-Tolerant Event-Driven Programming with Kafka, Kubernetes and gRPC by Natan Silnitsky Reacting to an Event-Driven World by Grace Jansen Cause of Death: Hibernate by Thorben Janssen NoSQL Endgame by Otavio Santana, Thodoris Bais, …

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How procurement can create value for IT projects

We know this, in many IT projects we need to make use of services and software and hardware that needs to be bought. Actually it often makes a huge difference, what kind of deals are made and how efficient the projects can work on this basis. I will just briefly tell a few stories and …

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Just run it twice

Often we use some kind of „clustered“ environment to run our software. This promises higher performance and better availability. And the frameworks seem to suggest that it is just a matter of starting it twice and it will magically work correctly. There is nothing wrong with investing some thoughts on this issue. It can actually …

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Pagination of Database Query Results

This article is highly inspired by the blog post We need tool support for keyset pagination. Please consider reading the original first and then my interpretation and additional thoughts about this idea. We have a typical database base backed web application. It can be a rich client. It can be a NoSQL database. Whatever, but …

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UUIDs revisited

UUIDs have proven useful in many circumstances. We have basically two main variants: The UUID is calculated as a combination of the Ethernet-MAC-address, the timestamp and a counter. The UUID is calculated using a good random number generator While variant 1 provides for a good uniqueness, there are some issues with it. Today we use …

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Cisactions

New research has analyzed the concept of transactions from a very theoretical point of view. An interesting result of this research was the concept of cisactions, which are in some way the opposite of transactions. A duality between cisactions and transactions has been proven. This means that in principal every application that is based on …

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Not all projects are on ideal paths II (Tim Finnerty)

This is another story of a project, that did not go as well as it could have gone while I was there. From unsuccessful projects we can learn a lot, so there will be stories like this once in a while. The first one was about Tom Rocket. Tim Finnerty It was the time, when …

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