An example showing how to manage a queue with ASIHTTPRequest

gistfile1.m

//
//  MyController.h
//
//  Created by Ben Copsey on 20/07/2009.
//  Copyright 2009 All-Seeing Interactive. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <GHUnit/GHUnit.h>
@class ASINetworkQueue;

@interface MyController : NSObject {
	ASINetworkQueue *networkQueue;
	
}

- (void)doNetworkOperations;

@property (retain) ASINetworkQueue *networkQueue;

@end

-------------------------------------------------------------------

//
//  MyController.m
//
//  Created by Ben Copsey on 20/07/2009.
//  Copyright 2009 All-Seeing Interactive. All rights reserved.
//

#import "MyController.h"
#import "ASIHTTPRequest.h"
#import "ASINetworkQueue.h"

@implementation MyController

- (void)dealloc
{
	[networkQueue release];
	[super dealloc];
}

- (void)doNetworkOperations
{
	// Stop anything already in the queue before removing it
	[[self networkQueue] cancelAllOperations];
	
	// Creating a new queue each time we use it means we don't have to worry about clearing delegates or resetting progress tracking
	[self setNetworkQueue:[ASINetworkQueue queue]];
	[[self networkQueue] setDelegate:self];
	[[self networkQueue] setRequestDidFinishSelector:@selector(requestFinished:)];
	[[self networkQueue] setRequestDidFailSelector:@selector(requestFailed:)];
	[[self networkQueue] setQueueDidFinishSelector:@selector(queueFinished:)];

	int i;
	for (i=0; i<5; i++) {
		ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://allseeing-i.com"]];
		[[self networkQueue] addOperation:request];
	}
	 
	[[self networkQueue] go];
}
	
- (void)requestFinished:(ASIHTTPRequest *)request
{
	// You could release the queue here if you wanted
	if ([[self networkQueue] requestsCount] == 0) {

		// Since this is a retained property, setting it to nil will release it
		// This is the safest way to handle releasing things - most of the time you only ever need to release in your accessors
		// And if you an Objective-C 2.0 property for the queue (as in this example) the accessor is generated automatically for you
		[self setNetworkQueue:nil]; 
	}
	
	//... Handle success
	NSLog(@"Request finished");
}

- (void)requestFailed:(ASIHTTPRequest *)request
{
	// You could release the queue here if you wanted
	if ([[self networkQueue] requestsCount] == 0) {
		[self setNetworkQueue:nil]; 
	}
	
	//... Handle failure
	NSLog(@"Request failed");
}


- (void)queueFinished:(ASINetworkQueue *)queue
{
	// You could release the queue here if you wanted
	if ([[self networkQueue] requestsCount] == 0) {
		[self setNetworkQueue:nil]; 
	}
	NSLog(@"Queue finished");
}

@synthesize networkQueue;
@end

In fact, it is no need to call go, operation will start automatically after adding to the queue.