NSURLSession track multiple get requests?

Question

I used to do what I wanted with NSURLConnection.

• I would create a new custom NSOperation object
• setup my NSMutalbeRequest and when ready trigger the operation witch would queue the operation...
• in there I would have the NSURLConnection delegate methods and with that I could track all progress, completion, errors etc...

So, the point is, request would be contained in its own operation and the delegate calls would happen in there, having a 1-to-1 relationship between the request operation object and the NSURLConnection delegate.

I am not sure HOW to do this with a NSURLSession. With the NSURLSession I can trigger all the dataTasks I want for all the GET calls I want to perform. However I setup the shared session using this call:

+ (NSURLSession *)sessionWithConfiguration:(NSURLSessionConfiguration *)configuration delegate:(id <NSURLSessionDelegate>)delegate delegateQueue:(NSOperationQueue *)queue;

So the problem I am trying to solve is how can I track multiple GET requests progress if I have only one object where all the delegate calls happen? I only have ONE DELEGATE in there. So now I have 1 session, 1 delegate object but I have multiple GET requests happening at the same time.

I know each task has a "taskIdentifier", but that requires me to have some kind of dictionary.

For example when the delegate call:

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data

is called, then I'd have to look up the task in a dictionary and then the object I'd get from the dictionary could have the reference to what I need to track the progress of that one request...

I am not sure what the best way to solve this problem is? Does anybody know how this should be done?

Answer 1

So,

what worked best for me so far is using the NSDictionary approach. That allows the NSURLSession delegates to get a hold of the right data task and handle multiple requests at once.

I am not sure if this is the best approach, but my app is now running lots of requests and things seems to work fine.

Answer 2

Basically what you need to do is set accessibility label for each requests

    for task 1

    [dataTask setAccessibilityLabel:@"label1"];

    for task 2

    [dataTask setAccessibilityLabel:@"label2"];

and then in delegate methods check for accessibility label

    if([dataTask.accessibilityLabel  isEqual: @"label1"])
     {
        // handle data from first task

     }

     if([dataTask.accessibilityLabel  isEqual: @"label2"])
     {
       // handle data from second task

     }

Answer 3

You could also instantiate the NSURLSessionDataTask with your own subclass of NSURLRequest which you can retrieve from task.originalRequest in the session delegate.