webrtc/talk/xmpp/pubsub_task.h

/*
 * libjingle
 * Copyright 2004--2011, Google Inc.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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 */

#ifndef TALK_XMPP_PUBSUB_TASK_H_
#define TALK_XMPP_PUBSUB_TASK_H_

#include <map>
#include <string>
#include "webrtc/libjingle/xmllite/xmlelement.h"
#include "webrtc/libjingle/xmpp/jid.h"
#include "webrtc/libjingle/xmpp/xmpptask.h"

namespace buzz {

// Base class to help write pubsub tasks.
// In ProcessStart call SubscribeNode with namespaces of interest along with
// NodeHandlers.
// When pubsub notifications arrive and matches the namespace, the NodeHandlers
// will be called back.
class PubsubTask : public buzz::XmppTask {
 public:
  virtual ~PubsubTask();

 protected:
  typedef void (PubsubTask::*NodeHandler)(const buzz::XmlElement* node);

  PubsubTask(XmppTaskParentInterface* parent, const buzz::Jid& pubsub_node_jid);

  virtual bool HandleStanza(const buzz::XmlElement* stanza);
  virtual int ProcessResponse();

  bool SubscribeToNode(const std::string& pubsub_node, NodeHandler handler);
  void UnsubscribeFromNode(const std::string& pubsub_node);

  // Called when there is an error. Derived class can do what it needs to.
  virtual void OnPubsubError(const buzz::XmlElement* error_stanza);

 private:
  typedef std::map<std::string, NodeHandler> NodeSubscriptions;

  void HandlePubsubIqGetResponse(const buzz::XmlElement* pubsub_iq_response);
  void HandlePubsubEventMessage(const buzz::XmlElement* pubsub_event_message);
  void HandlePubsubItems(const buzz::XmlElement* items);

  buzz::Jid pubsub_node_jid_;
  NodeSubscriptions subscribed_nodes_;
};

}  // namespace buzz

#endif // TALK_XMPP_PUBSUB_TASK_H_