XMPP协议实现即时通讯底层书写（二）--IOSXMPPFrameworkDemo+分

- (void)setupStream
{
	NSAssert(xmppStream == nil, @"Method setupStream invoked multiple times");
	
	// Setup xmpp stream
	// 
	// The XMPPStream is the base class for all activity.
	// Everything else plugs into the xmppStream, such as modules/extensions and delegates.

	xmppStream = [[XMPPStream alloc] init];
	
	#if !TARGET_IPHONE_SIMULATOR
	{
		// Want xmpp to run in the background?
		// 
		// P.S. - The simulator doesn't support backgrounding yet.
		//        When you try to set the associated property on the simulator, it simply fails.
		//        And when you background an app on the simulator,
		//        it just queues network traffic til the app is foregrounded again.
		//        We are patiently waiting for a fix from Apple.
		//        If you do enableBackgroundingOnSocket on the simulator,
		//        you will simply see an error message from the xmpp stack when it fails to set the property.
		
		<span style="color:#66ff99;">xmppStream.enableBackgroundingOnSocket = YES;</span>
	}
	#endif
	
	// Setup reconnect
	// 
	// The XMPPReconnect module monitors for "accidental disconnections" and
	// automatically reconnects the stream for you.
	// There&#39;s a bunch more information in the XMPPReconnect header file.
	
	xmppReconnect = [[XMPPReconnect alloc] init];
	
	// Setup roster
	// 
	// The XMPPRoster handles the xmpp protocol stuff related to the roster.
	// The storage for the roster is abstracted.
	// So you can use any storage mechanism you want.
	// You can store it all in memory, or use core data and store it on disk, or use core data with an in-memory store,
	// or setup your own using raw SQLite, or create your own storage mechanism.
	// You can do it however you like! It&#39;s your application.
	// But you do need to provide the roster with some storage facility.
	
	xmppRosterStorage = [[XMPPRosterCoreDataStorage alloc] init];
//	xmppRosterStorage = [[XMPPRosterCoreDataStorage alloc] initWithInMemoryStore];
	
	xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:xmppRosterStorage];
	
	xmppRoster.autoFetchRoster = YES;
	xmppRoster.autoAcceptKnownPresenceSubscriptionRequests = YES;
	
	// Setup vCard support
	// 
	// The vCard Avatar module works in conjuction with the standard vCard Temp module to download user avatars.
	// The XMPPRoster will automatically integrate with XMPPvCardAvatarModule to cache roster photos in the roster.
	
	xmppvCardStorage = [XMPPvCardCoreDataStorage sharedInstance];
	xmppvCardTempModule = [[XMPPvCardTempModule alloc] initWithvCardStorage:xmppvCardStorage];
	
	xmppvCardAvatarModule = [[XMPPvCardAvatarModule alloc] initWithvCardTempModule:xmppvCardTempModule];</span>
	
	// Setup capabilities
	// 
	// The XMPPCapabilities module handles all the complex hashing of the caps protocol (XEP-0115).
	// Basically, when other clients broadcast their presence on the network
	// they include information about what capabilities their client supports (audio, video, file transfer, etc).
	// But as you can imagine, this list starts to get pretty big.
	// This is where the hashing stuff comes into play.
	// Most people running the same version of the same client are going to have the same list of capabilities.
	// So the protocol defines a standardized way to hash the list of capabilities.
	// Clients then broadcast the tiny hash instead of the big list.
	// The XMPPCapabilities protocol automatically handles figuring out what these hashes mean,
	// and also persistently storing the hashes so lookups aren&#39;t needed in the future.
	// 
	// Similarly to the roster, the storage of the module is abstracted.
	// You are strongly encouraged to persist caps information across sessions.
	// 
	// The XMPPCapabilitiesCoreDataStorage is an ideal solution.
	// It can also be shared amongst multiple streams to further reduce hash lookups.
	
	xmppCapabilitiesStorage = [XMPPCapabilitiesCoreDataStorage sharedInstance];
    xmppCapabilities = [[XMPPCapabilities alloc] initWithCapabilitiesStorage:xmppCapabilitiesStorage];

    xmppCapabilities.autoFetchHashedCapabilities = YES;
    xmppCapabilities.autoFetchNonHashedCapabilities = NO;

	// Activate xmpp modules

	[xmppReconnect         activate:xmppStream];
	[xmppRoster            activate:xmppStream];
	[xmppvCardTempModule   activate:xmppStream];
	[xmppvCardAvatarModule activate:xmppStream];
	[xmppCapabilities      activate:xmppStream];

	// Add ourself as a delegate to anything we may be interested in

	[xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
	[xmppRoster addDelegate:self delegateQueue:dispatch_get_main_queue()];

	// Optional:
	// 
	// Replace me with the proper domain and port.
	// The example below is setup for a typical google talk account.
	// 
	// If you don&#39;t supply a hostName, then it will be automatically resolved using the JID (below).
	// For example, if you supply a JID like &#39;user@quack.com/rsrc&#39;
	// then the xmpp framework will follow the xmpp specification, and do a SRV lookup for quack.com.
	// 
	// If you don&#39;t specify a hostPort, then the default (5222) will be used.
	
//	[xmppStream setHostName:@"talk.google.com"];
//	[xmppStream setHostPort:5222];	
	

	// You may need to alter these settings depending on the server you&#39;re connecting to
	customCertEvaluation = YES;
}