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Messaging

Organizing (Commands, Events & Handlers) in Microservices

In a message-driven architecture such as SOA or Microservices, organizing commands and events, along with their respected handlers, can have a big impact on have you navigate your codebase. You might be surprised by the progression of how I organized them initially to what I do now! Also a tip on how to name commands and Events instead of after CRUD. 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. Building Blocks When moving into a message-driven system, you’re likely going to fall down… Read More »Organizing (Commands, Events & Handlers) in Microservices

REST APIs for Microservices? Beware!

Are you using REST APIs for a Microservices architecture? If you’re using REST, HTTP APIs, gRPC, or any other Request/Response model as the primary way to communicate between microservices, you’re going to need to deal with possibly hard to debug latency issues and address availability concerns. 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 Single Transaction First, let’s take a step back and talk about a monolith. When in a monolith, you’d typically have a single process communicating with your database. If… Read More »REST APIs for Microservices? Beware!

Messaging Commands & Events Explained!

In service oriented architecture (including microservices) that leverage messaging, you’re going to run into both types of messages: Commands & Events. What’s the difference between Commands & Events? When should you use a command and when should use an event? 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. What’s a Command? Commands are messages with the intent to change the state of the system. They are actions to be performed that have side effects. They may be created by an end-user… Read More »Messaging Commands & Events Explained!