Frank de Jonge writes about software design, architecture, domain-driven design and distributed systems.https://frankdejonge.nlhttps://frankdejonge.nl/blog/new-content-directionhttps://frankdejonge.nl/blog/new-content-directionOver the last couple of years, this blog has gone stale. I intend to change that and produce more content when I learn something new. This new content will still cover a lot of the things you're used to: software design, architecture, domain-driven design, and distributed…Wed, 08 Jul 2026 18:36:01 GMThttps://frankdejonge.nl/blog/encapsulating-interactions-with-the-outside-worldhttps://frankdejonge.nl/blog/encapsulating-interactions-with-the-outside-worldIn my ever-lasting battle against anemic domain models I've developed a preference on how to integrate with the external concerns. In this post I'd like to show an alternative, a strategy on how to keep encapsulating behaviour wile interacting with the outside world.Mon, 01 Aug 2022 12:33:57 GMTSoftware Designhttps://frankdejonge.nl/blog/use-a-message-envelopehttps://frankdejonge.nl/blog/use-a-message-envelopeEvent-driven architectures have various styles of communication. In my previous post I described a couple of event types you may see in these kinds of architectures.Mon, 07 Mar 2022 16:22:31 GMTEvent-Driven Architectureevent sourcingMessagingSoftware Designhttps://frankdejonge.nl/blog/the-different-types-of-events-in-event-driven-systemshttps://frankdejonge.nl/blog/the-different-types-of-events-in-event-driven-systemsEvent-driven systems come in all sorts of shapes and sizes. The obvious commonality is; they all use events to communicate information. These events come in many shapes and sizes, and determining what goes into an event has an immense impact on the design of your system.Sat, 19 Feb 2022 12:52:27 GMTSoftware DesignEvent-Driven ArchitectureMessaginghttps://frankdejonge.nl/blog/reliable-event-dispatching-using-a-transactional-outboxhttps://frankdejonge.nl/blog/reliable-event-dispatching-using-a-transactional-outboxUsing events in a system is great, but how do you know for sure if you've reliably dispatched your events? The transportation of events needs to be done reliably while maintaining overall system consistency, be it eventual or immediately.Thu, 20 Jan 2022 18:23:41 GMThttps://frankdejonge.nl/blog/flysystem-3-0-0-is-releasedhttps://frankdejonge.nl/blog/flysystem-3-0-0-is-releasedOn the 13th of January 2022, version 3.0.0 of Flysystem was released. The library ships a couple new methods on the main filesystem and adapter interfaces, making it a breaking change that cause a major version increase.Fri, 14 Jan 2022 18:51:49 GMTFlysystemhttps://frankdejonge.nl/blog/where-does-validation-livehttps://frankdejonge.nl/blog/where-does-validation-liveThis is a question I've received over and over again, a question that does not have a single answer. Sometimes when I explain how I approach this I get surprised reactions, so I figure I might as well share it in a blog post and see what other people think.Mon, 20 Dec 2021 20:32:18 GMTvalidationSoftware Designhttps://frankdejonge.nl/blog/ensuring-consistency-during-concurrent-requestshttps://frankdejonge.nl/blog/ensuring-consistency-during-concurrent-requestsBugs caused by race conditions can be a huge source of frustration. They are difficult to identify and often difficult to remedy. As part of my day to day job at Mollie, guarding against data inconsistencies is always top of mind.Mon, 01 Nov 2021 22:04:43 GMTConcurrencyParallelismhttps://frankdejonge.nl/blog/setting-up-a-typescript-mono-repo-for-scoped-packageshttps://frankdejonge.nl/blog/setting-up-a-typescript-mono-repo-for-scoped-packagesHow to use NPM workspaces for scoped packages.Sun, 08 Aug 2021 20:56:09 GMTtypescripthttps://frankdejonge.nl/blog/back-the-func-offhttps://frankdejonge.nl/blog/back-the-func-offIntegrating services over API's exposes your application to a range of possible failures. At scale, any network interaction can and will fail. Implementing a retry mechanism is a common approach to increase fault tolerance.Sat, 01 May 2021 15:46:17 GMTSoftware Designhttps://frankdejonge.nl/blog/a-new-major-version-of-flysystemhttps://frankdejonge.nl/blog/a-new-major-version-of-flysystemFor those who missed it, a new major version of Flysystem was released on the 24th of November. A new major version allows you break with the past for the sake of the future, which is exactly what I've done. For the second version of Flysystem I went back to the drawing board.Mon, 21 Dec 2020 13:13:50 GMThttps://frankdejonge.nl/blog/testing-without-mocking-frameworkshttps://frankdejonge.nl/blog/testing-without-mocking-frameworksOver the years, my coding practices have changed a lot. From hacking away until it works to TDD/BDD/DDD and everything in between. One of the biggest changes in my developer career has been when, why, and how I test my code.Mon, 23 Mar 2020 16:12:37 GMTTestinghttps://frankdejonge.nl/blog/setting-up-docs-with-tailwind-css-and-github-pageshttps://frankdejonge.nl/blog/setting-up-docs-with-tailwind-css-and-github-pagesTo me, Tailwind CSS is one of the the most enjoyable tools to build documentation websites. It's quick, it's easy, and it gets the job done well. The library has taken the world by storm, and that doesn't surprise me one bit.Mon, 12 Aug 2019 20:28:00 GMThttps://frankdejonge.nl/blog/type-safe-stream-processing-in-typescripthttps://frankdejonge.nl/blog/type-safe-stream-processing-in-typescript> This post contains a lot of back-story about how this all came about, you can skip ahead if you only care about the code. In case you haven't worked with TypeScript before: TypeScript is a superset of JavaScript that enhances the language by providing optional static typing.Thu, 02 May 2019 18:07:14 GMTtypescripthttps://frankdejonge.nl/blog/array-destructuring-in-phphttps://frankdejonge.nl/blog/array-destructuring-in-phpIn my day to day job I write in a number of programming languages. The majority of my time is spent writing PHP but I very much enjoy writing other languages, such as Go and Javascript, too! One of the things I like the most about JavaScript, and PHP also to some extent, is how…Mon, 30 Apr 2018 20:32:39 GMTSyntaxJavaScripthttps://frankdejonge.nl/blog/being-in-control-of-time-in-phphttps://frankdejonge.nl/blog/being-in-control-of-time-in-phpWhen developers talk about the infrastructural boundaries or external dependencies they often talk about databases and third-party integration. They're the first thing we'll put behind an interface so we can stub them out during our tests. This gives us some control over them.Thu, 08 Mar 2018 10:30:38 GMTTestinghttps://frankdejonge.nl/blog/regaining-trust-in-your-tests-with-dockerhttps://frankdejonge.nl/blog/regaining-trust-in-your-tests-with-dockerDocker, and containerised services in general, have brought a lot to the world of software development. While not everybody is (or ever should be) using docker as their deployment method, it's usefulness far exceeds being just a platform to run services on in production.Fri, 19 Jan 2018 15:13:46 GMTTestingFlysystemhttps://frankdejonge.nl/blog/parallelise-synchronous-business-processeshttps://frankdejonge.nl/blog/parallelise-synchronous-business-processesThe PHP landscape is getting more and more diverse. The typical PHP + MySQL combination is no longer the only way of doing things. Applications in PHP are not just fancy database wrappers anymore.Sun, 01 Oct 2017 11:54:16 GMTData EngineeringParallelismConcurrencyProcessingRace Conditionshttps://frankdejonge.nl/blog/symfony-routing-performance-considerationshttps://frankdejonge.nl/blog/symfony-routing-performance-considerationsLast week I took a deep dive into Symfony's Routing Component. A project I worked on suffered from a huge performance penalty caused by a routing mistake. This lead me on the path to discovering some interesting performance considerations.Tue, 28 Feb 2017 10:36:08 GMTSymfonyhttps://frankdejonge.nl/blog/how-a-20mb-data-set-brought-down-a-14gb-elasticsearch-clusterhttps://frankdejonge.nl/blog/how-a-20mb-data-set-brought-down-a-14gb-elasticsearch-clusterFor a client project we are using ElasticSearch (ES) as one of our read-models. The use-case was pretty straight forward and the amount of data was super small. However, our problems were pretty big.Fri, 15 Jul 2016 17:29:56 GMTDevOpsElasticSearchData Engineeringhttps://frankdejonge.nl/blog/finally-file-streams-and-deferred-execution-in-phphttps://frankdejonge.nl/blog/finally-file-streams-and-deferred-execution-in-phpCleaning up after yourself can be a tedious task. For example, closing file handlers after using them needs to be done. A programmer's life isn't all about the happy path. When things go pear-shaped you might end up duplicating cleanup code throughout your code.Mon, 30 May 2016 22:07:13 GMThttps://frankdejonge.nl/blog/nginx-vagrant-load-balancinghttps://frankdejonge.nl/blog/nginx-vagrant-load-balancingA load-balanced vagrant setup, because why the hell not! Not all projects require more that one instance of your application to handle the demand. When you do, you want to be prepared. You'll want to know which steps you have to take and which limitations you'll encounter.Fri, 04 Mar 2016 18:14:42 GMThttps://frankdejonge.nl/blog/pipelines-immutability-and-privateshttps://frankdejonge.nl/blog/pipelines-immutability-and-privatesA recent addition to the PHP League was the pipeline package, which allows you to compose sequential operations. One of the key aspects of the pipeline is that it's immutable. During the development of Pipeline, I learned a few lessons that I'd like to share with you.Fri, 04 Dec 2015 16:22:31 GMThttps://frankdejonge.nl/blog/onboarding-ansible-galaxyhttps://frankdejonge.nl/blog/onboarding-ansible-galaxyWhen you start working on a new project, there are usually a couple of steps you'll need to follow to get up and running. This process is called on-boarding. One of the steps in this process is getting your local development environment setup.Sun, 27 Sep 2015 12:59:38 GMTAnsibleDevOpshttps://frankdejonge.nl/blog/packages-vs-componentshttps://frankdejonge.nl/blog/packages-vs-componentsThe PHP landscape has fully transitioned into its Package Age™. Packagist is the main resource for retrieving new PHP packages: most frameworks split out packages from their main distribution to allow re-use outside of the framework. The world is a happy place.Fri, 26 Jun 2015 12:49:45 GMThttps://frankdejonge.nl/blog/rendering-reactjs-templates-server-sidehttps://frankdejonge.nl/blog/rendering-reactjs-templates-server-sideThe last couple of months I've been working with ReactJS quite extensively. It's been a very rewarding and insightful journey. There is, however, one part that kept coming back to me: server-side rendering.Mon, 18 May 2015 12:31:39 GMTReactJS