Hi,
I am new to cocoa and hence i have this basic question for which i could not
find a good answer after researching on this topic.

Let us say that there are two objects A and B.

1) Object A produces some data
2) Object B consumes the data produced by object A

When object B sends a message to object A for fetching the data, the data is
not available immediately. When the data arrives later, it needs to notify
object B.

For example, object A fetches data from some web service and Object B is
some sort of a "controller". How does one handle this in Cocoa ?

- I can include the functionality of Object A within Object B itself and
hence there is no issue. But i guess this is prohibited as per the MVC
design.
- Object A can retain object B and later send the message back when data is
available. But then this creates a dependency of  object B knowing object A
and object A knowing object B. Is this okay ?
- Any other way ?

Any help on this would be appreciated.

Thanks
mohan
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