Hi,
I think this has been covered before, but all the searches I’ve done don’t
really cover what I’d like to do.
I have an API that has two modes of operation, Sync and Async.
In Sync mode calls to the API MUST be on a background thread and the data is
returned to the caller with a possibility that the thread is blocked until the
operation has completed.
In Async mode calls to the API may be on the background thread or the Main
Thread, a delegate is passed to the API method which returns immediately and
the Delegate is called when the operation completes or fails.
This all works, however I have some existing code that I’d like to have the
same API and be called by a “Manager Class” which calls the correct underlying
API depending on the context, e.g.
AppLayer—>ManagerClass—>API_A
—>API_B
API_A is the existing API supporting the Sync/Async interface.
API_B is the one I wish to create.
The problem is that the existing code uses NSOperationQueue/NSOperation
accomplish it’s task, this works fine in Async mode, it was easy enough to
adapt to call the Delegate methods, but I’m not sure how to implement Sync mode?
Basically I want to add the NSOperation to the queue and then wait for it to
complete before returning with the results.
Any ideas suggestions would be greatly appreciated as there seem to be a lot of
conflicting advice out there on how to do this and I’ve not been able to find
anything worked as described above.
Thanks a lot.
All the Best
Dave
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