Model-View-Controller-Store - iOS Programming: The Big Nerd Ranch Guide - page 783

egate methods that handle the response would become giant if-else statements to determ-
ine what data belongs to which request.
The actor design pattern
Instead of having the BNRFeedStore be the delegate for every NSURLConnection ,
we are going to create another class named BNRConnection . The sole purpose of an in-
stance of this class will be to manage a single NSURLConnection .
BNRConnection instances will take the request prepared by the BNRFeedStore , start
their own NSURLConnection , and then receive all of the delegate messages from that
NSURLConnection . This object will do its work without bothering the controller or the
store until it has finished. When it finishes, it will execute the completion block supplied
by ListViewController ( Figure 28.7 ).
Figure 28.7 BNRConnection and NSURLConnection