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Derek Comartin

Building a Webhooks System with Event Driven Architecture

Do you need to integrate with external systems or services? Leveraging an event driven architecture enables you to build a webhooks system that can be decoupled from your main application code. Enabling you to call external systems that have subscribed via webhooks in complete isolation from your application code. YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything that is in this post. In-Process The simplest approach to building a webhooks system is to make calls in-process to the external HTTP APIs that want to be notified when we… Read More »Building a Webhooks System with Event Driven Architecture

Gotchas! in Event Driven Architecture

Event Driven Architecture has a few gotchas. Things that you always need to be aware of or think about. Regardless of whether you’re new to Event Driven Architecture or a seasoned veteran, these just don’t go away. Let me cover 4 aspects of event driven architecture that you need to think about. YouTube Check out my YouTube channel where I post all kinds of content that accompanies my posts including this video showing everything that is in this post. At Least Once Delivery You’ll likely use a broker that supports “at least once delivery”. This means that a message can be delivered… Read More »Gotchas! in Event Driven Architecture

Domain Logic: Where does it go?

I’d argue in most software that domain logic is written using Transaction Scripts. Transaction Scripts are single procedures that handle a request. While this can work fairly well in a lot of cases, it starts falling apart when you have a lot of domain complexity and/or a lot of various concerns. A sign you’ve gone too far is difficulty testing and wanting to call a transaction script from another transaction script. When this happens, what’s a solution? Encapsulating your domain logic and state changes within a Domain Model. YouTube Check out my YouTube channel where I post all kinds of content that… Read More »Domain Logic: Where does it go?