Hands-On Reactive Programming in Spring 5

Message-driven communication

The only question that is left unclear is how to connect components in the distributed system and preserve decoupling, isolation, and scalability at the same time. Let's consider communication between components over HTTP. The next code example, doing HTTP communication in Spring Framework 4, represents this concept:

@RequestMapping("/resource")                                       // (1)public Object processRequest() {    RestTemplate template = new RestTemplate();                    // (2)    ExamplesCollection result = template.getForObject(             // (3)        "http://example.com/api/resource2",                         //        ExamplesCollection.class                                    //    );                                                             //    ...                                                            // (4)    processResultFurther(result);                                  // (5)}

The previous code is explained as follows:

1. The code at this point is a request handler mapping declaration ...