We will start with the simplest design pattern, the request-response pattern, which addresses the responsiveness pillar of reactive programming. This is one of the core patterns that we use in almost every application. It is our service that takes a request and returns a response. A lot of other patterns are directly or indirectly dependent on this, so it is worth spending a few minutes to understand this pattern.
The following diagram shows a simple request-response communication:
There are two parties to a request-response relationship. One entity makes a request and the second entity fulfills the request. A requester ...
