How to implement NSOperationQueue in right way - ios

Question

I am new in operation queue, so give me flexibility to ask that question which may ask already meanwhile I searched a lot but not able to find my desired solution.
I have a API which delete single document and its working fine via using AFNetworking(which take documentID as param and accesstoken). Now I want to delete multiples document the solution should be that I should have another API which takes array or string (comma separated).
As far as I know the solution should be to call that API into Loop and delete all, but I heard another solution which is NSOperationQueue. I saw tutorial but I am not able to use those in right manner.
Here below is my code to call one operation.
NSString *jsonString = #"";
NSString *authorizationValue = [self setAuthorizationValue:action];
NSString *language = #"en_US";
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:language forHTTPHeaderField:#"Accept-Language"];
[request setValue:authorizationValue forHTTPHeaderField:#"authorization"];
//convert parameters in to json data
if ([params isKindOfClass:[NSDictionary class]]) {
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:params
options:NSJSONWritingPrettyPrinted
error:&error];
jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}
[request setURL:[NSURL URLWithString:action]];
[request setTimeoutInterval:500.0];
[request setHTTPMethod:#"DELETE"];
NSMutableData *postBody = [NSMutableData data];
[postBody appendData:[jsonString dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postBody];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
operation.responseSerializer = [AFJSONResponseSerializer serializer];
So kindly guide me how call this in operation queue, do I need to create these call and put into array and then add those into operation queue.
NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];
// Set the max number of concurrent operations (threads)
[operationQueue setMaxConcurrentOperationCount:3];
[operationQueue addOperations:#[operation] waitUntilFinished:NO];
Looking for your response.
Thanks

Answer 1

the solution should be that I should have another API which takes array or string (comma separated)
This would be the best solution, yes, because it minimise the workload of the client and the server and makes the smallest number of network requests possible - it's fast and efficient.
the solution should be to call that API into Loop and delete all, but I heard another solution which is NSOperationQueue
Using an operation queue is better than running in a loop because you have control over the timing (how many operations run concurrently), which you already show in your code.
The only issue with your code is calling NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init]; each time before adding the new operation. Instead of doing that you should create and configure the operation queue once and store a strong reference to it. Otherwise you have lots of different operation queues each executing operations concurrently and your setting of setMaxConcurrentOperationCount:3 means nothing.