Hi, I am David Buchmann, a Switzerland based web developer. I work for Liip AG, doing Symfony based API projects. I am involved in a couple of Open Source projects and an occasional conference speaker. I maintain the FOSHttpCache library, a PHP tool to work with HTTP caches, am a founding member of HTTPlug and of the Symfony CMF project.
This blog is mainly a reference of my public speaking activity, with occasional posts on other things, mostly also code related.
@dbu @dbu
In a recent project, I maxed out on available pins of the ESP 8266 (Wemos/Lolin D1 mini). A few pins did not work as input pins for me. In the end, I had to resort to the analog pin for the last input.
For future me and anyone who cares, I note here which pins I was able to use. (I use the Wemos D1 mini names - other packaging of the ESP chip might use different names, but also might has different behaviour.)
Letzten Herbst besuchte ich mit meinem Göttibueb die Modellbaumesse in Friedrichshafen. Er war vor allem an den Modelleisenbahnen interessiert, was mir recht ist, war ich doch als Kind und Teenager auch grosser Modelleisenbahn Fan. Auf dem Heimweg sagte er mir, dass er sich als Geburtstagsgeschenk ein Haus aus dem 3D Drucker für seine Eisenbahn wünscht. Das Thema hat mich gereizt, und so begann diese Story...
Last autumn, I visited a model building fair with my godson. He is mostly interested in model trains, which suits me well, having been a model train aficionado as a kid and teenager. On the way home, he told me that he would love to get a 3D printed house for his own model railway as his birthday present. I thought that sounds cool, and so it began...
Conference: Software Talks, St.Gallen, Switzerland
Title: Can Postgres cover your NoSQL needs?
Links: slides, examples and performance measurements
Postgres is famous for its support for SQL data. However, Postgres also has powerful capabilities to work with JSON. I will show how to leverage the various JSON functions of modern Postgres to work with your less structured data. I will also show how to use some of that functionality from within Doctrine.
Visit the git repository for example code and performance test data. I also wrote blog post about the topic on my employers web site: JSON in Postgres and Doctrine ORM support for JSON.
Conference: Symfony Con Vienna, Austria
Title: Can Postgres cover your NoSQL needs?
Links: slides, examples and performance measurements
Postgres is famous for its support for SQL data. However, Postgres also has powerful capabilities to work with JSON. I will show how to leverage the various JSON functions of modern Postgres to work with your less structured data. I will also show how to use some of that functionality from within Doctrine.
Visit the git repository for example code and performance test data.
Conference: Drupal Mountain Camp, Davos, Switzerland
Title: HTTP Caching with Varnish
Links: slides
Get an introduction to caching "on the edge".
With the Varnish caching proxy, you can greatly increase the speed of websites and handle a lot more load. The basics are quite simple once you understand how the cache handling in HTTP works, so we will look into that first. We then go over cache invalidation, cache tagging strategies and have a look at Edge Side Includes (ESI).
Meetup: Symfony User Group Zurich, Switzerland
Title: Symfony Messenger Demo
Links: slides | demo
I gave a demonstration of Symfony Messenger at the Symfony User Group Meetup in Zürich.
Conference: Confoo 2024, Montreal, Canada
Title: Decoupling an application with Symfony Messenger
Links: slides
Quick response times are crucial. Time consuming tasks triggered in web requests should be executed asynchronously, if at all possible. In this talk I will give a short overview of what message queues are and then show a case study how we split up an application into smaller services and how we use message queues to coordinate the services.
Conference: Confoo 2024, Montreal, Canada
Title: Going crazy with caching: Caching pages of logged in users
Links: slides
You know how HTTP caching works but need more? In this talk we look into ways to cache personalized content. We will look at Edge Side Includes (ESI) to tailor caching rules of fragments, and at the user context concept to differentiate cache entries by permission groups instead of by individual users. The FOSHttpCache library in combination with either Varnish or the Symfony HttpCache reverse proxy are a big help to leverage the user context concept.
Conference: Symfony User Group Basel, Switzerland
Title: Langfristige Applikationen mit Symfony
I did this talk in german, together with my colleague Martin Janser. We explained the success factors how we continuously improved a large Symfony application over 10 years.
At the meetup, I also jumped in to present the talk from another colleague Emanuele Panzeri who unfortunately had to cancel his attendance due to sickness: "Firefighting a Symfony & Elasticsearch app with Blackfire".