Posts on Andreas Billmann Blog

Sticky Session Controller for Kubernetes

Thu, 03 Nov 2022 02:00:00 +0200

In this post I want to show an implemention of a sticky session controller for kubernetes in .net6. Some ingress controller for kubernetes support sticky session handling, like Traefik. The provided solution for Traefik is based on cookies. But what if a client can not handle cookies? Or a more complex strategy is needed to find the right instance of a pod?

Change database connection based on path to support multitenancy

Tue, 19 Nov 2019 02:00:00 +0200

In this post I want to show an implemention of a lightweight multitenancy solution with ef core. The solution will use a database per tenant and the database connection is set up on every request based on the path. The first part of the path is the tenant id and is used as the database name.

Setup MicroK8s

Tue, 12 Nov 2019 20:00:00 +0200

I needed a test kubernetes cluster to deploy my applications during the development. I have a Intel NUC which is perfect as small server and installed Ubuntu Server 19.10 and at the end of the installation the setup asked if I want to install MicroK8s.

As I have only installed a full featured kubernetes cluster on linux and on Windows I am using Docker Desktop for Windows with Kubernetes, I thought I give it a try.

It took a little while, but I ended up with a nice little kubernetes running which is perfect for my needs.

SmartCSV.fx Version 1.0.0

Thu, 24 Oct 2019 22:08:49 +0200

After a long time of inactivity, I managed to release version 1.0.0 A former colleague asked me for a feature for SmartCSV.fx. He needed the ability to set the encoding. I was about to program it, when I saw that I had received a PullRequest that solved the problem. This motivated me to write two of the outstanding issues on the way to release 1.0.0. SmartCSV.fx now supports changing the order of columns using drag’n’drop and I created an official logo.

Develop With Containers

Fri, 04 Jan 2019 22:36:08 +0100

When using docker for developing a microsoervice architecture, than the easiest way to let them run on a development machine is by putting all pieces into docker containers and let the debugger debug into the docker container.

This can slow down your development process as a change in the application can result in a compile, build image, start container process. And the classic way of comiple and run in the IDE tend to be a lot faster.

So I came up with a solution that our nginx reverse proxy does not send the request to the containers, that I am working on, but to the host. And all containers I am not working on are running as containers.

In my example, I have a simple .NET core REST-API as backend server I am working on, an Angular application as frontend I am working on and another backend service which is just used as it is.

Configure URL from server before http-request in Angular

Wed, 16 Aug 2017 21:35:33 +0200

Setting the url in the environment was not useful, as each customer needs his own url and this would end up in big build scripts.

Also the customer could not reorganize the server names on his own, without breaking the application if he chooses to change the server name.

Angular ControlValueAccessor by example

Tue, 08 Aug 2017 23:05:44 +0200

At sLAB we currently develop an angular client for the sMOTIVE product. We wanted to extend some form controls with own behavior and had some issues with the ControlValueAccessor.

Migrating climbing course website to Angular

Sat, 18 Mar 2017 00:01:49 +0200

As my company decides to evaluate Angular 2 as our new framework to build our web application, I thought it would be a good experience to migrate one of my own projects to Angular 2.

Kotlin and TornadoFX

Wed, 19 Oct 2016 16:37:21 +0200

As I have changed the JSON for configure the SmartCSV.fx from my own Schema to JSON Table Schema, I had to provide a converter for existing configurations.

I wanted to write less code than I typically do in Java and learn something new. Therefor I started a new project in Kotlin a programming language invented by JetBrains, the people behind the excellent IntelliJ IDEA IDE.

SmartCSV.fx version 0.9

Wed, 19 Oct 2016 02:31:39 +0200

The newest version of SmartCSV.fx has some major changes. The most important one is the support of the JSON Table Schema from the Open Knowledge Foundation.

SmartCSV.fx version 0.6

Mon, 08 Aug 2016 02:44:12 +0200

As the interest in the project grows, I revisited the validation algorithm and refactored it.

SmartCSV.fx version 0.4

Sat, 30 Jul 2016 13:17:11 +0200

Improved performance and some nice additional features to help the user finding the errors.

SmartCSV.fx

Sun, 29 Nov 2015 13:48:01 +0200

At work I have the need to fix wrong CSV files from customers. It is hard to find the errors and fix them in a texteditor, even in a “normal” CSV editor. So I decided to write this simple JavaFX application.

GeoFroggerFX 2.0 Development Preview

Thu, 19 Mar 2015 13:52:26 +0200

I rewrote the GeoFroggerFX application for several reasons.

New features for GeoFroggerFX

Sun, 29 Sep 2013 15:39:29 +0200

I added H2 Database, JPA and a groovy plugin interface to the application.

Second preview of GeoFroggerFX the JavaFX application

Wed, 11 Sep 2013 15:49:57 +0200

This is the second preview of GeoFroggerFX my little geocaching application written in JavaFX.

Video of GeoFroggerFX handling 11.334 Caches

Mon, 09 Sep 2013 15:50:54 +0200

This little video shows a preview of the GeoFroggerFX application handling more than 10.000 items in the ListView. Currently the items are read and parsed from a gpx file with 124Mb and the domain objects are still in memory.

JavaFX: custom ListCell

Wed, 03 Jul 2013 15:51:55 +0200

I have a list of geocaches in my GeoFroggerFX (replacement for my GeoCachingFrogger based on Netbeans) which should provide more information in a row.

JavaFX: MiniIcon(Animation)Button refactored

Wed, 22 Aug 2012 15:52:37 +0200

Jonathan Giles wrote in his Blog that

This kind of code should be polished and added to the JFXtras project!

So I thought this would be a good start to learn more about JavaFX internals and how to do it the right way. There is a talk at parleys where Jasper Potts and Jonathan Giles talk about creating a custom UI control. I wish I had seen this earlier.

JavaFX: MiniIconAnimationButton

Sun, 05 Aug 2012 15:53:16 +0200

In the last JavaFX blog post I showed how a button with an glowing effect can be used to catch the users attention. In this blog post I develop a button based on StackPane to have a normal button in the back and an optional animating image icon in the front.

JavaFX: glowing icon button as an eye-catcher

Mon, 16 Jul 2012 16:08:42 +0200

These buttons inform the user that there is some waiting work which has to be finished or some incoming messages are waiting.

JasperReports - Subreport-DataSource

Thu, 01 Dec 2011 16:10:26 +0200

In project I had the case that I had to pass the complete datasource of the parent report to a subreport.