NSURLSession Implementation performance issue - ios

Question

My application having around 10 to 30 webservices(both get/post).previously i have used Async NSURLconnection. which takes around 5 sec to excute all services. But now i have replaced NSurlsession which get delay in response compare to nsurlconnection ,it is delayed by 4 to 6 times . here i have attached one of the webservice method code for reference . like below i have code for all methods .
Example NSURLsession code
#pragma mark - NSURLSession
- (NSURLSession *)createSession
{
NSLog(#"DSCReturnAPI: %s",__func__);
static NSURLSession *session = nil;
NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfig.timeoutIntervalForRequest = WEBSERVICE_TIMEOUT;
session = [NSURLSession sessionWithConfiguration:sessionConfig
delegate:self
delegateQueue:[NSOperationQueue mainQueue]];
return session;
}
#pragma mark - API Callbacks
-(void)getMyData{
#try {
_webServieRequestType = HWDSCReturnGetRequestType;
NSString *countrycode = [BusinessManager sharedInstance].countryCode;//[HWUserDefaults countryCode];
NSString *userid = [BusinessManager sharedInstance].userId;// [HWUserDefaults userId];
NSString *accessToken = [BusinessManager sharedInstance].accessToken;//[HWUserDefaults accessToken];
NSString *deviceId = [HWUserDefaults deviceId];
[HelperCallbacks logText:[NSString stringWithFormat:#"AccessToken %#",accessToken]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:API_DSCRETURN(countrycode,userid)]];
[request setHTTPMethod:#"GET"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:accessToken forHTTPHeaderField:#"Authorization"];
[request setValue:deviceId forHTTPHeaderField:#"deviceId"];
[request setValue:#"ba598025146eff37e26c9150b180a78b" forHTTPHeaderField:#"If-None-Match"];
theSession = [self createSession];
theDataTask = [theSession dataTaskWithRequest:request];
[theDataTask resume];
}
#catch (NSException *exception) {
[ExceptionHandler sendException:exception];
}
}
#pragma mark - NSURLSessionDataDelegate
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data {
NSLog(#"DSCReturnAPI: %s",__func__);
// NSArray *dataArray = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
if (theSession == session) {
if (_receivedData == nil) {
_receivedData = [[NSMutableData alloc] initWithData:data];
} else {
[_receivedData appendData:data];
}
}
else
{
//NSLog(#"");
}
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
NSLog(#"DSCReturnAPI: %s",__func__);
if (theSession == session) {
[BusinessManager sharedInstance].urlResponseRecieved = NO;
NSLog(#"DSCReturnAPI: httpResponse:%#",response);
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
httpStatusCode =(int) [httpResponse statusCode]; // To track response Code:
NSLog(#"DSCReturnAPI : Http code:%d",httpStatusCode);
NSLog(#"DSCReturnAPI : Headers %#",[httpResponse allHeaderFields]);
_receivedData = [[NSMutableData alloc]init]; }
completionHandler(NSURLSessionResponseAllow);
}
#pragma mark - NSURLSessionTaskDelegate
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{
NSLog(#"DSCReturnAPI: %s",__func__);
NSLog(#"DSCReturnAPI: didFailWithError :error : %# errorCode: %ld",error.description,(long)error.code);
#try {
if ([self.serviceDelegate conformsToProtocol:#protocol(ServiceMgrProtocol)] && [self.serviceDelegate respondsToSelector:#selector(webServiceDidFailDSCReturnWithError:)]&& error.code != 0) {
[self.serviceDelegate webServiceDidFailDSCReturnWithError:error.localizedDescription];
}
else {
NSLog(#"DSCReturnAPI:SUCCESS");
[self processResponse];
}
}
#catch (NSException *exception) {
[ExceptionHandler sendException:exception];
}
#finally {
if (theSession) {
theSession = nil;
}
_receivedData = nil;
} }

Answer 1

I think no need to go for such methods of NSURLSession . It has its own block which runs on main thread.
NSMutableURLRequest *request =[[NSMutableURLRequest alloc] initWithURL:requestURL];
NSLog(#"fetchAPromotionWithType = %#", requestURL);
[request setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *task = [session dataTaskWithRequest:request
completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error)
{
dispatch_async(dispatch_get_main_queue(), ^{
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
int responseStatusCode = (int)[httpResponse statusCode];
if ( responseStatusCode == OK_RESPONSE_CODE || responseStatusCode == CREATED_RESPONSE_CODE || responseStatusCode == ACCEPTED_RESPONSE_CODE || responseStatusCode == PARTIAL_RESPONSE_CODE)
{
if (data)
{
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSLog(#"Data->%#",dict);
if (dict != nil && [dict isKindOfClass:[NSDictionary class]])
{
NSDictionary *dataDict = [dict objectForKey:#"data"];
if (dataDict != nil && [dataDict isKindOfClass:[NSDictionary class]])
{
//Get your success Data
}
}
}
}
else
{
if (responseStatusCode == 0)
{
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:#"No Connection! Please try again.", #"message", nil];
//Get Your Fail Data
}
else if (data)
{
// NSArray *tempArray = #[#"fan", #"vungle"];
//[JLSharedData sharedManager].savedWaterfallInterstitialArray = nil; //testing
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
//Get Your Fail Data
}
}
});
}];
[task resume];
}];