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Microservices: Decomposing Applications for Deployability and Scalability

This rule of thumb usually can help you distinguish between these different kinds of rules. The Application Layer is the second most inner layer of the architecture. Note that, ideally, you should always try to implement behaviors in Domain Models to avoid falling in the Anemic Domain Model pitfall. This rule also exists in other similar architectures, such as Clean Architecture. It’s very powerful and closely connected to two other architectural styles—Layered and Hexagonal.

We should be able to build a software that can be maintained by future developers. The point is, these architectures differ in their implementation, not their goals. This architecture is actually an evolution of traditional application modeling. Reduces clutter, provides scalability, centralizes business rules, which ensures reusability.

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Today, we can refer to Microsoft’s platform as an onion-based architecture that is used with both ASP.NET and Visual Studio successfully. Onion architecture is a software architectural configuration to maintain libraries and dependencies on the extremities of a software system while sustaining a strong and cohesive system core. We can understand how this is being used in the application to follow DDD. This Domain Service is a process (checkout) which is not the responsibility of the domain model itself and it is adding an operation to the model (Purchase Aggregate Root). Another major difference with the microservice architecture is how the different components of the application interact. In a monolithic application, components call one another via regular method calls.

Benefits and Drawbacks of Onion Architecture

At the center of Onion Architecture is the domain model, which represents the business and behavior objects. Around the domain layer are other layers, with more behaviors. As per traditional architecture, the UI layer interacts to business logic, and business logic talks to the data layer, and all the layers are mixed up and depend heavily on each other. In 3-tier and n-tier architectures, none of the layers are independent; this fact raises a separation of concerns.

Benefits And Drawbacks Of Onion Architecture

This way, when you want to test it, you can just inject a mock that implements the interface your code is expecting to. So, the only place in your application that actually creates objects that are capable of doing IO is the application’s entrypoint. The Infrastructure Layer uses them, but is does not create them. In Onion Architecture, the database is just a infrastructure detail.

Database Independent – Since we have a clean separation of data access, it is quite easy to switch between different database providers. Now, let’s work on the Core Layers starting from the Domain Project. It basically has the models/entities, Exception, validation rules, Settings, and anything that is quite common throughout the solution. Maybe an Entity Framework Core Layer for Accessing the DB, a Layer specifically made to generate JWT Tokens for Authentication or even a Hangfire Layer. You will understand more when we start Implementing Onion Architecture in ASP.NET Core WebApi Project. To maintain structural Sanity in Mid to Larger Solutions, it is always recommended to follow some kind of architecture.


You can use basic structs or simple Data Transfer objects if you like. Or you can pack it into a hashmap, or construct it into an object. The important thing is that isolated, https://www.globalcloudteam.com/ simple, data structures are passed across the boundaries. Standardized interfaces between layers usually confine the effect of code changes to the layer that is changed.

Benefits and Drawbacks of Onion Architecture

This is something really bad in building scalable applications and may pose issues with the growth of the codebase. To keep it clear, in the above diagram we can see that the presentation layer depends on the logics layer, which in turn depends on the data access and so on. The onion architecture business logic is relevant to the application is contained in the application layer, which also acts as a link between the domain and presentation levels. It converts the domain layer’s use cases and business rules into actions that the presentation layer can comprehend.

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It’s the perfect solution to create a logical model, although this often turns out to be a pain in the back. If you decide to implement onion architecture in your application, you’ll get multiple benefits. Further, the biggest drawback of this architecture is unnecessary coupling that it creates. Each layer is coupled to the layers below it, which creates a very tight coupling between these layers, and a tightly coupled system enforces several restrictions and challenges when undergoing changes. Common pitfalls to avoid when implementing Onion Architecture include not separating concerns properly, creating tight coupling between layers, and not managing dependencies correctly. The Onion Architecture’s testability is one of its main advantages.

  • Each team can develop, deploy and scale their service independently of all of the other teams.
  • In clean architecture, too, all source code dependencies point exclusively in the direction of the core.
  • So the shape of the interface is directly related to the scenario it is used in the business logic.
  • No direction is provided by the Onion Architecture guidelines about how the layers should be implemented.
  • This way, your DAL would reference/depend on the business layer so that it’s implementations implement the abstractions which exist in the business layer.

There are a lot of aspects to the Onion Architecture, and if we have a common term to describe this approach, we can communicate more effectively. This project can save well over 200+ hours of development time for your team. I am planning to build a fully-fledged Clean Architecture Solution Template, which you guys can just download and start using for your new projects in no time. Inside the v1 Folder, add a new empty API Controller named ProductController. Since this is a very basic controller that calls the mediator object, I will not go in deep. However, I have previously written a detailed article on CQRS implementation in ASP.NET Core 3.1 API.

Task vs. ValueTask in .NET: Understanding the Difference

It is simpler to test each layer independently since the architecture encourages the separation of concerns. It is also simpler to maintain the overall design because of the distinct separation of responsibilities across levels, which means that modifications in one layer do not need changes in other layers. The program can easily be expanded with additional features and capabilities because of its modular architecture without affecting the primary domain layer. It can be hard to implement a service using Onion Architecture when you have a database-centric background. The change in paradigm is not so straightforward, so you will need to invest some time in learning the architecture before you can use it effortlessly.

Benefits and Drawbacks of Onion Architecture

First, developers must deal with the additional complexity of creating a distributed system. Developers must implement an inter-process communication mechanism. Implementing use cases that span multiple services without using distributed transactions is difficult.

What are the benefits of Onion Architecture?​

In this article, you will learn about the motivations for using the microservice architecture and how it compares with the more traditional, monolithic architecture. You will learn how to solve some of the key technical challenges with using the microservice architecture including inter-service communication and distributed data management. The outer layer is reserved for things that change often outside of the applications core business logic that interact with it. In the case of the UI, it is a service in itself, it will have its own logic and tests which validate it behaves as expected.

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