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It would need a method for each of list/detail/insert/update/delete, but its handling of the response would be similar.
muddle the responsibilities of the Command, making it implicitly involved in the persistence mechanism by implementing Responder and handling ResultEvents and FaultEvents
The command would then trigger different notifications based on the response it gets back, which might mean a Command and/or Mediators answer, that end of things - handling of the result - will vary based on your app.
"A Proxy retrieves the data from a service and a pop up retrieves it from the user; that is the only difference."
...when I've several view/components in an app (let's say Header, nav and their associated pages, login and profile panels and several others), I see explosion of mediator and viewComponent classes.