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Derek Comartin

Wix.com – 5 Event Driven Architecture Pitfalls!

Wix.com migrated from a request-reply RPC style system to an event driven architecture and, not surprisingly, ran into a few issues. One of the developers wrote a blog post outlining five event driven architecture pitfalls they experienced. Here’s my review of that post, and hopefully sheds more light on their problems and solutions. YouTube Check out my YouTube channel, where I post all kinds of content accompanying my posts, including this video showing everything in this post. Reliable Publishing When using an event driven architecture, you’ll be publishing events as a communication mechanism to other parts of your system. You’re telling other… Read More »Wix.com – 5 Event Driven Architecture Pitfalls!

Stop using trivial Guard Clauses! Try this instead

Guard clauses, on the surface, sound like a great idea. They can reduce conditional complexity by exiting a method or function early. However, I find guard clauses used in the real world to be of little value. Often polluting application-level code for trivial preconditions. I will refactor some code to push those preconditions forcing the edge of your application so your domain focuses on real business concerns. YouTube Check out my YouTube channel, where I post all kinds of content accompanying my posts, including this video showing everything in this post. Null Checks The most common case of guard clauses is doing… Read More »Stop using trivial Guard Clauses! Try this instead

Do you want to use Kafka? Or do you need a Queue?

Do you want to use Kafka? Or do you need a message broker and queues? While they can seem similar, they have different purposes. I’m going to explain the differences, so you don’t try to brute force patterns and concepts in Kafka that are better used with a message broker. YouTube Check out my YouTube channel, where I post all kinds of content accompanying my posts, including this video showing everything in this post. Partitioned Log Kafka is a log. Specifically a partitioned log. I’ll discuss the partition part later in this post and how that affects ordered processing and concurrency. When… Read More »Do you want to use Kafka? Or do you need a Queue?