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PONSURLConnection delegate methods on background thread
 

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  1. PONSURLConnection delegate methods on background thread
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    <p><strong>EDIT2 - Rewrote the question</strong></p> <p>I want to do some web service communication in the background. I am using <a href="http://sudzc.com/" rel="nofollow">Sudzc</a> as the handler of HTTPRequests and it works like this:</p> <pre><code>SudzcWS *service = [[SudzcWS alloc] init]; [service sendOrders:self withXML:@"my xml here" action:@selector(handleOrderSending:)]; [service release]; </code></pre> <p>It sends some XML to the webservice, and the response (in this one, a Boolean) is handled in the selector specified:</p> <pre><code>- (void)handleOrderSending:(id)value { //some controls if ([value boolValue] == YES) { //my stuff } } </code></pre> <p>When I tried to use Grand Central Dispatch on my <code>sendOrders:withXML:action:</code> method, I noticed that the selector is not called. And I believe the reason for that is that <strong>NSURLConnection delegate messages are sent to the thread of which the connection is created</strong> But the thread does not live that long, it ends when the method finishes, killing any messages to the delegate.</p> <p>Regards</p> <p><strong>EDIT1</strong> <code>[request send]</code> method:</p> <pre><code>- (void) send { //dispatch_async(backgroundQueue, ^(void){ // If we don't have a handler, create a default one if(handler == nil) { handler = [[SoapHandler alloc] init]; } // Make sure the network is available if([SoapReachability connectedToNetwork] == NO) { NSError* error = [NSError errorWithDomain:@"SudzC" code:400 userInfo:[NSDictionary dictionaryWithObject:@"The network is not available" forKey:NSLocalizedDescriptionKey]]; [self handleError: error]; } // Make sure we can reach the host if([SoapReachability hostAvailable:url.host] == NO) { NSError* error = [NSError errorWithDomain:@"SudzC" code:410 userInfo:[NSDictionary dictionaryWithObject:@"The host is not available" forKey:NSLocalizedDescriptionKey]]; [self handleError: error]; } // Output the URL if logging is enabled if(logging) { NSLog(@"Loading: %@", url.absoluteString); } // Create the request NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL: url]; if(soapAction != nil) { [request addValue: soapAction forHTTPHeaderField: @"SOAPAction"]; } if(postData != nil) { [request setHTTPMethod: @"POST"]; [request addValue: @"text/xml; charset=utf-8" forHTTPHeaderField: @"Content-Type"]; [request setHTTPBody: [postData dataUsingEncoding: NSUTF8StringEncoding]]; if(self.logging) { NSLog(@"%@", postData); } } //dispatch_async(dispatch_get_main_queue(), ^(void){ // Create the connection conn = [[NSURLConnection alloc] initWithRequest: request delegate: self]; if(conn) { NSLog(@" POST DATA %@", receivedData); receivedData = [[NSMutableData data] retain]; NSLog(@" POST DATA %@", receivedData); } else { // We will want to call the onerror method selector here... if(self.handler != nil) { NSError* error = [NSError errorWithDomain:@"SoapRequest" code:404 userInfo: [NSDictionary dictionaryWithObjectsAndKeys: @"Could not create connection", NSLocalizedDescriptionKey,nil]]; [self handleError: error]; } } //}); //finished = NO; // while(!finished) { // // [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]; // // } //}); } </code></pre> <p>The parts that are commented out are the various things I tried. The last part worked but I'M not sure if that's a good way. In the <code>NURLConnection</code> delegate method of the class, here is what happens:</p> <pre><code>- (void)connectionDidFinishLoading:(NSURLConnection *)connection { NSError* error; if(self.logging == YES) { NSString* response = [[NSString alloc] initWithData: self.receivedData encoding: NSUTF8StringEncoding]; NSLog(@"%@", response); [response release]; } CXMLDocument* doc = [[CXMLDocument alloc] initWithData: self.receivedData options: 0 error: &amp;error]; if(doc == nil) { [self handleError:error]; return; } id output = nil; SoapFault* fault = [SoapFault faultWithXMLDocument: doc]; if([fault hasFault]) { if(self.action == nil) { [self handleFault: fault]; } else { if(self.handler != nil &amp;&amp; [self.handler respondsToSelector: self.action]) { [self.handler performSelector: self.action withObject: fault]; } else { NSLog(@"SOAP Fault: %@", fault); } } } else { CXMLNode* element = [[Soap getNode: [doc rootElement] withName: @"Body"] childAtIndex:0]; if(deserializeTo == nil) { output = [Soap deserialize:element]; } else { if([deserializeTo respondsToSelector: @selector(initWithNode:)]) { element = [element childAtIndex:0]; output = [deserializeTo initWithNode: element]; } else { NSString* value = [[[element childAtIndex:0] childAtIndex:0] stringValue]; output = [Soap convert: value toType: deserializeTo]; } } if(self.action == nil) { self.action = @selector(onload:); } if(self.handler != nil &amp;&amp; [self.handler respondsToSelector: self.action]) { [self.handler performSelector: self.action withObject: output]; } else if(self.defaultHandler != nil &amp;&amp; [self.defaultHandler respondsToSelector:@selector(onload:)]) { [self.defaultHandler onload:output]; } } [self.handler release]; [doc release]; [conn release]; conn = nil; [self.receivedData release]; } </code></pre> <p>The delegate is unable to send messages because the thread it is dies when <code>-(void)send</code> finishes.</p>
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