Question

What will be if I calls simultaneously [[RKClient sharedClient] get@”foo.xml” delegate:self] in two UIViewControllers? Do I have any problems?

viewController_A
{
[[RKClient sharedClient] get:@"foo.xml" delegate:self];
}

viewController_B
{
 [[RKClient sharedClient] get:@"foo.xml" delegate:self];
}

Answer 1

If you have a look at the RKClient implementation for get:delegate: it simply does this

- (RKRequest *)get:(NSString *)resourcePath delegate:(id)delegate {
    return [self load:resourcePath method:RKRequestMethodGET params:nil delegate:delegate];
}

and the implementation for load:method:params:delegate: is

- (RKRequest *)load:(NSString *)resourcePath method:(RKRequestMethod)method params:(NSObject<RKRequestSerializable> *)params delegate:(id)delegate {
    NSURL* resourcePathURL = nil;
    if (method == RKRequestMethodGET) {
        resourcePathURL = [self URLForResourcePath:resourcePath queryParams:(NSDictionary*)params];
    } else {
        resourcePathURL = [self URLForResourcePath:resourcePath];
    }
    RKRequest *request = [[RKRequest alloc] initWithURL:resourcePathURL delegate:delegate];
    [self setupRequest:request];
    [request autorelease];
    request.method = method;
    if (method != RKRequestMethodGET) {
        request.params = params;
    }

    [request send];

    return request;
}

It’s not using any RKClient state / shared data so you won’t see a problem. The method get:delegate: is asynchronous itself so this stuff will happen in the background anyway.