Comment dois-je faire Asynchrone NSURLConnection à l'intérieur d'un NSOperation?

Je veux faire un Asynchrous NSURLConnection à l'intérieur d'un NSOperation sur un thread d'arrière-plan.

(c'est parce que je suis en train de faire quelques très cher des opérations sur les données qu'ils reviennent qui veulent faire comme les données et en arrière-plan)

Ici est ma première tentative:

DANS mon AppDelegate:

//create the opperation and add it to the queue:
self.sharedOperationQueue = [[[NSOperationQueue alloc] init] autorelease];
LibXMLOperation *op = [[[LibXMLOperation alloc] init] autorelease];
[self.sharedOperationQueue addOperation:op];

Voici mon opération:

@interface EbirdLibXMLOperation : NSOperation {
@private
NSURLConnection *urlConnection;
//Overall state of the parser, used to exit the run loop.
BOOL done;
//properties to maintain the NSOperation
BOOL finished;
BOOL executing;  
}
- (void)downloadAndParse:(NSURL *)url;
- (void)start;
- (BOOL)isConcurrent;
- (BOOL)isFinished;
- (BOOL)isExecuting;
@property BOOL done;
@property (nonatomic, retain) NSURLConnection *ebirdConnection;
//The autorelease pool property is assign because autorelease pools cannot be retained.
@property (nonatomic, assign) NSAutoreleasePool *downloadAndParsePool;
@end
@implementation LibXMLOperation
@synthesize urlConnection, done;
- (void)start{
if (![self isCancelled]) {
[self willChangeValueForKey:@"isExecuting"];
executing = YES;
//set up the thread and kick it off...
[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSURL *url = [NSURL URLWithString:@"http://google.com"];
[NSThread detachNewThreadSelector:@selector(downloadAndParse:) toTarget:self withObject:url];
[self didChangeValueForKey:@"isExecuting"];
} else {
//If it's already been cancelled, mark the operation as finished.
[self willChangeValueForKey:@"isFinished"];
finished = YES;
[self didChangeValueForKey:@"isFinished"];
}
}
- (BOOL)isConcurrent {
return YES;
}
- (BOOL)isExecuting {
return executing;
}
- (BOOL)isFinished {
return finished;
}
- (void)downloadAndParse:(NSURL *)url {
self.downloadAndParsePool = [[NSAutoreleasePool alloc] init];
done = NO;
self.characterBuffer = [NSMutableData data];
[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSURLRequest *theRequest = [NSURLRequest requestWithURL:url];
urlConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (urlConnection != nil) {
do {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
} while (!done);
}
[self willChangeValueForKey:@"isFinished"];
[self willChangeValueForKey:@"isExecuting"];
finished = YES;
executing = NO;
//Clean up.
self.urlConnection = nil;
[downloadAndParsePool release];
NSLog(@"download and parse cleaning up");
self.downloadAndParsePool = nil;
[self didChangeValueForKey:@"isExecuting"];
[self didChangeValueForKey:@"isFinished"];  
}
#pragma mark NSURLConnection Delegate methods
//Disable caching so that each time we run this app we are starting with a clean slate.
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {
return nil;
}
//Forward errors to the delegate.
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
done = YES;
}
//Called when a chunk of data has been downloaded.
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
//Process the downloaded chunk of data.
NSLog(@"Did received %i bytes", [data length]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
//Set the condition which ends the run loop.
done = YES; 
}    
@end

Lorsque cela fonctionne, je vois le message suivant dans mon journal:

2009-08-20 15:18:48.858 App[1001:3e03]*** _NSAutoreleaseNoPool(): Object 0x1126a20 of class NSCFArray autoreleased with no pool in place - just leaking
Stack: (0x305a2e6f 0x30504682 0x3057deba 0x305ced09 0x30577ddf 0x3056b43e 0x3050764a 0x58fc3 0x3050a79d 0x3050a338 0x94568155 0x94568012)

Cet événement qui se passe à la dernière [auto didChangeValueForKey:@"isFinished"]; ce qui me laisse croire que je suis la mise en place de la NSOperation mal.