Java EE 8 Design Patterns and Best Practices

Establishing a hexagonal model for the application

A typical application keeps its various functional modules together. Generally, this typical application has a hexagonal structure or architecture (we will see a better definition of the hexagonal architecture later) with the core business in the center of the structure. The core business contains all the management of the services offered by the application. There are also links with the various components external to this core, such as messaging services, database, client machines, and so on. These connections with the external world have specific adapters and protocols, such as a database adapter, REST API, Web API, Messaging API, WebSocket protocol, and so on, as shown in the following ...