Complete Example Code

DeDupeExample

- (AFHTTPRequestOperation *)GET:(NSString *)urlString 
                     parameters:(NSDictionary *)parameters 
                        success:(void (^)(AFHTTPRequestOperation*,id))success 
                        failure:(void (^)(AFHTTPRequestOperation*,NSError*))failure
{

	NSCAssert([NSThread isMainThread], @"must execute on the main thread");
 
 	NSURL *url = [[NSURL URLWithString:urlString relativeToURL:self.baseURL] absoluteString];
	NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:@"GET"
			 URLString:url
            parameters:parameters 
				 error:nil];
 
	NSMutableArray *callbacksArray = self.getRequestsDictionary[request.URL];
	if (!callbacksArray) {
		callbacksArray = [NSMutableArray new];
		[self.getRequestsDictionary setObject:callbacksArray forKey:request.URL];
	}
	[callbacksArray addObject:[[YLSuccessFailureModel alloc]
			initWithSuccessBlock:success failureBlock:failure]];
  
	if ([callbacksArray count] > 1) {
		return nil;
	}
  
	__weak typeof(self) weakSelf = self;
  
	void (^triggerCallbacks)(AFHTTPRequestOperation*, id) =
	^void(AFHTTPRequestOperation *operation, id responseOrError) {
		NSCAssert([NSThread isMainThread], @"Must be on the main thread");
 
		BOOL failure = [responseOrError isKindOfClass:[NSError class]];
		NSURL *url = operation.request.URL;
		NSArray *callBacksForRequestBlock = weakSelf.getRequestsDictionary[url]; // ARC retains until end of scope
      
		// Immediately remove the key because some callbacks may actually trigger the same URL,
		// and we don't want the de-duper to recognize that fresh call as a duplicate.
		[weakSelf.getRequestsDictionary removeObjectForKey:url];
      
		for (YLSuccessFailureModel *successFailureObject in callBacksForRequestBlock) {
			if (failure) {
				if (successFailureObject.failure) {
					successFailureObject.failure(operation, responseOrError);
				}
			} else if (successFailureObject.success) {
				successFailureObject.success(operation, responseOrError);
			}
		}
	};
  
	return [super GET:URLString parameters:parameters
									success:triggerCallbacks
									failure:triggerCallbacks];
}