Understanding the principles of the SOA approach
Like classes in an object-oriented architecture, services are implementations of interfaces that, in turn, come from a system's functional specifications. Therefore, the first step in a service design is the definition of its abstract interface. During this stage, you define all the service operations as interface methods that operate on the types of your favorite language (C#, Java, C++, JavaScript, and so on) and decide which operations to implement with synchronous communication and which ones to implement with asynchronous communication.
The interfaces that are defined in this initial stage will not necessarily be used in the actual service implementation and are just useful design tools. Once we have decided on the architecture of the services, these interfaces are usually redefined so that we can adapt them to the peculiarity of the architecture.
It is worth pointing out that SOA messages must keep the same...
