In Java, layers are typically implemented as packages. As you can see from the diagram, all layer (inter-package) dependencies point downwards. Hexagonal (ports & adapters): Thomas Pierrain has a great blog post that describes the hexagonal architecture, as does Alistair Cockburn of course. Hexagonal architecture is an application design pattern. It solves some problems of the layered architecture by introducing ports-and-adapter for the dependencies between our components of the application toward our domain objects. The domain objects are the core part of the application and it is the part of inside a hexagon. Hexagonal Architecture tells us no framework should be present inside the domain to avoid technical accidental complexity and to ease the migration to a new structural framework (or major version) without redeveloping parts of business logics. This means that when you are using Spring, you cannot rely on any stereotype annotations such as @Service or @Component inside your domain. In this tutorial, we’ll implement a simple Java application applying hexagonal architecture design principles. Additionally, we’ll organize our application layers using Java Modules, which Introduction. Hexagonal architecture is a software architecture which breaks down functionality in different components. The components or adapters communicate with the application core via the ports. The goal is to create loosely coupled components. As a result, components are easily replaced, deployed, and tested. Usually those constructions are packages, with this idea we create an application using the Hexagonal Architecture Style, (in languages like Java you have the package private classes, The name hexagonal architecture comes from the way this architecture is usually depicted: We are going to return to why hexagons are used later in this article. This arhictecture also goes under the names ports and adapters (which better explains the central idea behind it) and onion architecture (because of how it is layered). Normally, hexagonal architecture is used with DDD, but other architectures can be used instead. Example: The Java packages or namespaces on C#. Strategic design concepts. Hexagonal architecture is a valid and solid pattern. The article seemed somewhat too superficial to me, but that is just my opinion. Also my opinion is that truth is somewhere in the middle - use methods and tactics from hexagonal architecture to serve your purpose mixed with other techniques, but alone it is not enough. The hexagonal architecture is based on three principles and techniques: Explicitly separate User-Side, Business Logic, and Server-Side. Dependencies are going from User-Side and Server-Side to the Business Logic. We isolate the boundaries by using Ports and Adapters.
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