Scalable Aggregates: Reducing Complexity in Command Handlers

Scalable Aggregates: Reducing Complexity in Command Handlers

In this article, I will show you a way to reduce complexity from your aggregates and make them scale better.

Aggregates are the heart of your system. They hold domain logic and are responsible for emitting events that will eventually make your data consistent across multiples data projections and bounded contexts.

Because aggregates are so important, it is crucial to keep them small and easy to understand, but how to this when the domain gets bigger and bigger?

In this article, I will show you a way to reduce complexity from your aggregates and make them scale better.

Write-side domain overview

Before getting started, let review how commands are executed and turned into events.

After receiving the command sent by the user, the command handler invokes the repository to load the aggregate state in memory. Then, the command is executed on the aggregate which emits either domain events or failures. Finally, those events or failures are persisted using the repository.

e.g.

[πŸ‘€ Coder]
  -> [βœ‰οΈ Comment issue command]
  -> [πŸ“« Comment issue handler]
  -> [πŸ‡ Issue aggregate]
  -> [⚑️ Issue commented event]

cqrs ddd aggregates csharp programming c++

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