Understanding DispatcherHandler
DispatcherHandler, a front controller in Spring WebFlux, is what DispatcherServlet is in the Spring MVC framework. DispatcherHandler contains an algorithm that makes use of special components – HandlerMapping (maps requests to the handler), HandlerAdapter (a DispatcherHandler helper to invoke a handler mapped to a request), and HandlerResultHandler (a palindrome of words, for processing the result and forming results) – for processing requests. The DispatcherHandler component is identified by a bean named webHandler.
It processes requests in the following way:
- A web request is received by
DispatcherHandler. DispatcherHandlerusesHandlerMappingto find a matching handler for the request and uses the first match.- It then uses the respective
HandlerAdapterto process the request, which exposes theHandlerResult(return value after processing). The return value could be one of the following –ResponseEntity,ServerResponse...