How to Build Microservices with Onion Architecture: Hands-On Experience

Domain-Driven Design also has a service concept that is slightly different from the concept of an application service. Onion Architecture provides flexibility in the implementation of the application. The implementation of the Infrastructure layer can be easily changed without affecting the Domain layer or the User Interface layer. This provides flexibility in the choice of technologies and platforms used in the implementation of the application.

onion architecture

Domain Entities are the fundamental building block of Domain-Driven Design and they’re used to model concepts of your Ubiquitous Language in code. Entities are Domain concepts that have a unique identity in the problem domain. Domain entities encapsulate attributes and entity behaviour. It is supposed to be independent of specific technologies like databases or web APIs.

Implement Onion Architecture.

I see that abstracting from persistence can be done using repository interfaces as ports, but another option is to create a port/adapter for the ORM. The first option is far simpler, the second option I find more correct. Yes, you can definitely use Repository Pattern alongside Onion Architecture.

  • In this article, we are going to learn about Onion architecture and what are its advantages.
  • I see that abstracting from persistence can be done using repository interfaces as ports, but another option is to create a port/adapter for the ORM.
  • Overall, careful design and implementation are key to avoiding these common pitfalls and building a successful Actix web and onion architecture based web application in Rust.
  • In this post I am going to talk about Onion Architecture.
  • Onion Architecture makes the application more testable.

These layers can use the same models, interfaces, and in some cases, implementations! For projects where we would need completely different logic, such as a Web App for example, we can implement multiple versions of the Domain and Application layers. It also allows for closer monitoring and management of the codebase; keeping people from making calls directly from one layer to another. The only thing you have to emphasize is, “Are you adding a reference to another project to get something done? A strong and scale-able architecture is important in applications, especially in Mobile Apps. APIs and SDKs are constantly changing, new technology is constantly released, and team sizes are always changing.

Onion Architecture

This can result in increased code overhead and a larger codebase, which can make the application more difficult to maintain. Onion Architecture makes the application more scalable. The Domain layer, which contains the business logic, can be easily scaled by adding more instances of the application.

onion architecture

Services will be unaware of the concrete implementation that they will use such as a diesel based repository. Onion architectures are commonly used by software engineering teams and in a wide amount of program languages. It is therefore interesting to see how Rust functions in such an architecture.

How to Build Microservices Using Onion Architecture: Hands-On Experience

Looking back at all of the components of our Onion Architecture, one might think, “Wow, that’s a lot of code to do a simple task”. It’s important to remember that this architecture is not for every project. If your project has the potential to grow into something quite complicated, with many developers involved, this type of solution might work best for you. However, if you’re working on something quick to get out the door, maybe getting right to the point is easier and best for you. In our project, we also want to install MvvmLight, just like in our Client and Platform layers. We will also need to add references to our Domain.Models, Domain.Interfaces, Application.Models, Application.Interfaces, and Infrastructure.Businessprojects.

onion architecture

We have to realize that everything is a tradeoff in software engineering. We have prepared a project that follows the Onion architecture which we are going to use in the rest of the article. This library provides almost limitless opportunities for setting data validation rules. It is well compatible with CQRS due to pipeline behaviors.

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I recently started to learn .Net Core and found that there is what is called clean architecture and knew nothing about it. You have made it clear and simple though yet not confident with it because I know the coding part will be application-specific and hence will differ here and there. I am pleased with this Onion architecture and I wish to follow it more and more by implementing it in all my projects.

onion architecture