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Clean Up Bloated CQRS Handlers

We’ve all had bloated CQRS handlers. You open up a command, query, or event handler, and it’s a bloated mess. It’s a nightmare of code. There’s validation, authorization, state changes, side effects, logging, it’s a mess to maintain and it’s really hard to test. YouTube Check out my YouTube channel, where I post all kinds of content on Software Architecture & Design, including this video showing everything in this post. The Bloated Handler Now, mind you, this is a very simple example, but you’ll get the gist because there are a lot of concerns here. This example is dispatching a shipment, basically,… Read More »Clean Up Bloated CQRS Handlers

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Double Dispatch in DDD

What’s Double Dispatch? Well, before we get to what it is, there is a common belief in domain-driven design that you want to keep your domain pure, meaning no dependencies, no services, no distractions. I get it because you do not want that core logic coupled to infrastructure concerns like database calls. You want it to be deterministic because you want it to be testable. But somewhere along the way this advice turned into dogma that you cannot inject behavior into your domain. I am going to challenge that. If you are modeling your domain and capturing behavior, you can… Read More »Double Dispatch in DDD

Authorization: Domain or Application Layer?

I’m diving into a super common question that’s really important: where should your authorization live? Should it live within your domain or your application layer? I am going to show some real world code examples and some simple guidelines so you can keep your software architecture consistent and avoid authorization code scattered everywhere. YouTube Check out my YouTube channel, where I post all kinds of content on Software Architecture & Design, including this video showing everything in this post. Authentication versus Authorization I want to make the distinction because a lot of people mix these up. Authentication is who are you. That… Read More »Authorization: Domain or Application Layer?