Google Talk for Developers

SessionClient Class

This is a pure virtual base class that translates between XMPP (for network transmission) and XmppSessionMessage and SessionDescription objects (used internally by libjingle). You should override this class with logic specific to your session type. In particular, you should override the methods declared by this class.

You should also define a string namespace to use as the session name when calling SessionManager::CreateSession. This should be a unique identifier for the SessionClass type. libjingle defines two values: NS_TUNNEL and NS_PHONE (both #defined values).

SessionClient translates session message stanzas between XMPP and SessionDescription objects. Session description information is customized for different types of sessions (for example, codecs for voice chat and file names for file transfer applications), so subclasses must be specifically designed to be able to read or create these messages. See Extending Session Client for more information about extending this object to support new session types.

The application instantiates this object. The methods shown are not thread-safe, and can be called on any thread, but you should call them from the signaling thread.

Syntax

class SessionClient 

Methods

The following table lists public and protected (shaded rows) member methods for SessionClient.

Name Description
virtual SessionDescription* CreateSessionDescription(const buzz::XmlElement *element)=0 Converts an XMPP element into a SessionDescription object for internal libjingle use.
virtual void OnSessionCreate(Session * session, bool received_initiate) = 0

Called by the SessionManager object when a Session object is created, either explicitly as part of an outgoing connection request, or implicitly as part of an incoming connection request.

Your implementation should determine whether the session represents an incoming or an outgoing connection request. If this is incoming, received_initiate will be True, and your application should connect to the Session's signals and perform any other session-specific tasks, such as adding it to a list of active sessions and instantiating helper objects or resources. The voice chat example creates a new Call object when this method is received. It should also send a notification to the user about the incoming call, to enable them to call Session::Accept or Session::Reject to accept or reject the connection request.

virtual void OnSessionDestroy(Session * session) = 0 Called when a Session object is destroyed. You should use this to remove any pointers you hold to the object, and release any resources you associated with the session. This includes destroying the Transport object associated with the Session by calling Session::DestroySocket.
SessionClient(SessionManager *psm) Constructor for the object.
~SessionClient Destructor for the object.
virtual buzz::XmlElement* TranslateSessionDescription(const SessionDescription *description)=0 Converts a SessionDescription object into an XML stanza to send out. Subclasses must implement this in order to parse out custom information required for each type of session (for example, audio codecs for a voice chat, file names for a file transfer).

Attributes: public

Declaration file: talk/p2p/base/sessionclient.h

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