AFNetworking batch requests - canceling when first one fails - ios

Question

I'm using AFNetworking code for batching requests. I have really copy & paste from example code - it looks like that:
NSMutableArray *mutableOperations = [NSMutableArray array];
for (NSURL *fileURL in filesToUpload) {
NSURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:#"POST" URLString:#"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData
[formData appendPartWithFileURL:fileURL name:#"images[]" error:nil];
}];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[mutableOperations addObject:operation];
}
NSArray *operations = [AFURLConnectionOperation batchOfRequestOperations:mutableOperation progressBlock:^(NSUInteger numberOfFinishedOperations, NSUInteger totalNumberOfOperations) {
NSLog(#"%lu of %lu complete", numberOfFinishedOperations, totalNumberOfOperations);
} completionBlock:^(NSArray *operations) {
NSLog(#"All operations in batch complete");
}];
[[NSOperationQueue mainQueue] addOperations:operations waitUntilFinished:NO];
Now what I want to achieve is to cancel all other operation in that queue if the first one fails.
I found a solution for 1.0.3 with AFHttpClient but nothing for 2.0.
Any tips ?

Answer 1

Rather than adding the operations to the [NSOperationQueue mainQueue], create your own operation queue. So, in your #interface define a queue:
#property (nonatomic, strong) NSOperationQueue *networkQueue;
Then, instantiate a queue:
self.networkQueue = [[NSOperationQueue alloc] init];
self.networkQueue.name = #"com.domain.app.networkqueue";
// if you want it to be a serial queue, set maxConcurrentOperationCount to 1
//
// self.networkQueue.maxConcurrentOperationCount = 1;
//
// if you want it to be a concurrent queue, set it to some reasonable value
//
// self.networkQueue.maxConcurrentOperationCount = 4;
Then, add your network operations to this queue (bypassing batchOfRequestOperations):
NSOperation *completionOperation = [NSBlockOperation blockOperationWithBlock:^{
NSLog(#"All operations done");
}];
// NSOperation *previousOperation = nil; // if you uncomment dependency code below, uncomment this, too
for (NSURL *fileURL in filesToUpload) {
NSURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:#"POST" URLString:#"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData
[formData appendPartWithFileURL:fileURL name:#"images[]" error:nil];
}];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
// if you want the operations to run serially, you can also
// make each dependent upon the prior one, as well
//
// if (previousOperation)
// [operation addDependency:previousOperation];
//
// previousOperation = operation;
[completionOperation addDependency:operation];
[self.networkQueue addOperation:operation];
}
[self.networkQueue addOperation:completionOperation];
And, finally, if you want to cancel the operations, you can do:
[self.networkQueue cancelAllOperations];