cqrs.md

Command and query responsibility segregation

Process of registering, requesting handlers.

Table of Contents

• Registering
• Requesting

Registering

Things to consider:

• Registering the same name will overwrite the existing handler.
• Request is supposed to have an name property.

With <handler-name> being the name we use to handle requests with, the <callback> being the callback that will handle the request, TRequest being the type of request and TRequestResponse being the type of response, we register an handler like so:

  mediator.register.handler<TRequest, TRequestResponse>(
    handler-name: string,
    callback: (request: TRequest) => TRequestResponse
  );

Requesting

Things to consider:

• The request needs to have a name property that corresponsds to the name of the handler.

With <request> being the request object that is passed to handler, TRequest being the type of request and TRequestResponse being the type of response, we handle an request like so:

  let response = mediator.handle<TRequest, TRequestResponse>(
    request: TRequest
    );