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Testing your Domain when Event Sourcing

How do you test your domain when Event Sourcing? I find testing aggregates with Event Sourcing to be simpler than testing if you’re storing the current state. The inputs to your aggregate are events and the output of your aggregate are events. Given a stream of events When a valid command is performedThen new event(s) occurs 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. Event Sourcing I’ve covered Event Sourcing in my Event Sourcing Example & Explained in plain English post. So check… Read More »Testing your Domain when Event Sourcing

Problem Details for Better REST HTTP API Errors

How do you tell your API Consumers explicitly if there are errors or problems with their request? Everyone creating HTTP APIs seems to implement error responses differently. Wouldn’t it be great if HTTP API Errors had a standard? Well, there is! It’s called Problem Details (https://tools.ietf.org/html/rfc7807) 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. If you’re creating a RESTful HTTP API, Status Codes can be a good way to indicate to the client if a request was successful or not. The most common… Read More »Problem Details for Better REST HTTP API Errors

Event Based Architecture: What do you mean by EVENT?

The term “Event” is really overloaded. There are many different utilities that leverage events. Event Sourcing, Event Carried State Transfer, and Event Notifications. None of these are for the same purpose. When talking about an Event Based architecture, realize which one you’re using and for what purpose. 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. Overloaded With the popularity of Microservices, Event Driven Architecture, Event Sourcing, and tooling, the term “Events” has become pretty overloaded and I find has been causing some confusion.… Read More »Event Based Architecture: What do you mean by EVENT?