Why Vertical Slice Architecture Beats Onion Architecture | Saad Al-Hussan Foundation for Safety Equipment

Why Vertical Slice Architecture Beats Onion Architecture

For a Web application, it represents the Web API or Unit Test project. This layer has an implementation of the dependency injection principle so that the application builds a loosely coupled structure and can communicate to the internal layer via interfaces. Many years back, we started a long-term project by building an “onion” architecture. Within a couple of months, the cracks started to show in this style. So we moved towards a Command Query Responsibility Segregation pattern and began building in vertical slices instead of layers . Since then, we’ve almost exclusively built around vertical slice architectures for applications and systems and I can’t imagine going back to the constraints of layered architectures.

In this we discussies the the event itself, what makes it challenging, and the approach the TU Munich took. We discuss the importance of simulation, the limits of hardware, how Docker helps crossing this gap, and the role of open source software when taking on such a challenge. ASP.NET Core offers Health Checks Middleware and libraries for reporting the health of app infrastructure components. To put it simply, every action in Web API is either a request or a command , but it shouldn’t do both. Consequently, each API method is divided into requests and commands.

Onion Architecture Is Interesting

In today’s world of request and response logic, you will need a repository interface and gateways to https://globalcloudteam.com/ handle the situation. This facilitates by protecting your business from undesired dependencies.

The business rules decide what gets stored, but they don’t do the storing. This is an example of a pattern that I’m going to have, actually, I have this on my to-do list, an episode about this. In plan then act, you make a plan, and then you act. You have to make a lot of decisions when you’re building software. Let’s look at how this onion architecture does some very common operations.

When To Apply Onion Architecture?

Please restrict yourself by keeping just the properties or definitions inside your domain objects and not any piece of code which talks to database or has any other business functions. Besides the domain objects, you could also have domain interfaces, but just the interfaces and not any kind of implementation. The layer is intended to create an abstraction layer between the Domain entities layer and the Business Logic layer of an application. It is a data access pattern that prompts a more loosely coupled approach to data access. We create a generic repository, which queries the data source for the data, maps the data from the data source to a business entity, and persists changes in the business entity to the data source. The outer layers of the architecture implement these interfaces.

  • Most people understand that in the layered architecture, almost all layers depend on the infrastructure layer.
  • The system can be quickly tested because the application core is independent.
  • The main idea behind the Onion architecture is the flow of dependencies, or rather how the layers interact with each other.
  • The strategy is to make interfaces defined in the domain layer and put the implementation in Infrastructure layer.

A Web UI could be replaced with a console UI, for example, without changing the business rules. The business rules can be tested without the UI, Database, Web Server, or any other external element. According to some authors, the hexagonal architecture is at the origin of the microservices architecture. The term “hexagonal” implies that there are 6 parts to the concept, whereas there are only 4 key areas. The term’s usage comes from the graphical conventions that shows the application component like a hexagonal cell. The purpose was not to suggest that there would be six borders/ports, but to leave enough space to represent the different interfaces needed between the component and the external world. The term “hexagonal” comes from the graphical conventions that shows the application component like a hexagonal cell.

Configuring The Services

Sometimes these are still required by our tools (like controllers or ORM units-of-work) but we keep our cross-slice logic sharing to a minimum. Application Service Layer – orchestration of infrastructure and domain service interfaces for uses cases.

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To build this layer, we create one more class library project named OA.Repo. This project holds both repository and data, context classes. It holds POCO classes along with configuration classes. It represents the Domain Entities layer of the onion architecture. Our fare calculation depends on external services such as routing information and fare models. Interfaces for these are defined in the Domain Services layer — IFareRepostory and IRouteService.

Onion Architecture In Net Core

Service Interface Layer– common operations like Add, Save, Delete should go in here within interfaces. You can define your transactional interfaces like (IOrderService.SubmitOrder) here. One of the most important thing to notice here that service interfaces are kept separate from its implementation, which shows the loose coupling and separation of concerns. Another approach to look at the problems described above is to look at the Traditional Architecture diagram below.

It’s actually dumb, and that’s a good thing because you want the business rules to decide what happens. You don’t want the email server to decide what happens, the email system. Then a lot of systems you do the database, the queries and the SQL statements are all smeared all over the code. If you ever wanted to change the database, let’s say, you go from SQL to no SQL, oh man, you’re going to have to go every line of code inspected. Such stateless/dependency-less services are mixed up with stateful dependencies and other dependencies, which assumes the application boundary invocation. As soon as there are more than 5-6 dependencies in the service – its constructor become hard to read.


Now we have the account, deduct the cost of the transaction from Andres balance and update it within our database.If the update fails, we need to return an error stating so. Ability to re-configure the dependencies of these utility classes without falling into poor man DI – negated by the fact that there are zero dependencies in such language patch function libraries. I have personally not come across a clean implementation on a WebAPI, which is the reason that I started building this up. There are quite a lot of improvements and fixes along the way from the day I started out.

We have the flexibility of being able to change the outer layers without impacting the inner, and more important, layers. It makes use of the Dependency Inversion Principle, at an architectural level. However, given the heart of the architecture being a domain model, I would say that you should definitely avoid mixing it with those less important concerns like UI. The DbContext onion architecture pros and cons must have an instance of DbContextOptions in order to execute. We will use dependency injection, so we pass options via constructor dependency injection. ASP.NET Core is designed from the ground to support and leverage dependency injection. Thus, we create generic repository interface for the entity operations, so that we can develop loosely coupled application.

Application Services

The obvious advantage of the Onion architecture is that our controller’s methods become very thin. This is the true beauty of the Onion architecture. We moved all of the important business logic into the Service layer. There are more examples, but hopefully, you get the idea. We are hiding all the implementation details in the Infrastructure layer because it is at the top of the Onion architecture, while all of the lower layers depend on the interfaces .

onion architecture

Together they represent the core business logic of the application. I recently built a small ASP.NET Core API that shows my preferred approach to testing cloud apps.

The Layers

In the year 1996 Frank Buschmann, Regine Meunier, Hans Rohnert, Peter Sommerlad and Michael Stal analyzed different software systems. They asked themselves what patterns make software systems successful and allow us to evolve systems without developing a big ball of mud. Their knowledge was published in a book called Pattern-oriented Software Architecture – A System of Patterns. Application interface methods will typically be called from a controller in the WebApi Infrastructure layer to perform an action on its behalf.

onion architecture

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