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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _XMPPTASK_H_
#define _XMPPTASK_H_
#include <string>
#include <deque>
#include "talk/base/sigslot.h"
#include "talk/xmpp/xmppengine.h"
#include "talk/base/task.h"
namespace buzz {
/////////////////////////////////////////////////////////////////////
//
// XMPPTASK
//
/////////////////////////////////////////////////////////////////////
//
// See Task and XmppClient first.
//
// XmppTask is a task that is designed to go underneath XmppClient and be
// useful there. It has a way of finding its XmppClient parent so you
// can have it nested arbitrarily deep under an XmppClient and it can
// still find the XMPP services.
//
// Tasks register themselves to listen to particular kinds of stanzas
// that are sent out by the client. Rather than processing stanzas
// right away, they should decide if they own the sent stanza,
// and if so, queue it and Wake() the task, or if a stanza does not belong
// to you, return false right away so the next XmppTask can take a crack.
// This technique (synchronous recognize, but asynchronous processing)
// allows you to have arbitrary logic for recognizing stanzas yet still,
// for example, disconnect a client while processing a stanza -
// without reentrancy problems.
//
/////////////////////////////////////////////////////////////////////
class XmppClient;
class XmppTask :
public Task,
public XmppStanzaHandler,
public sigslot::has_slots<>
{
public:
XmppTask(Task * parent, XmppEngine::HandlerLevel level = XmppEngine::HL_NONE);
virtual ~XmppTask();
virtual XmppClient * GetClient() const { return client_; }
std::string task_id() const { return id_; }
protected:
friend class XmppClient;
XmppReturnStatus SendStanza(const XmlElement * stanza);
XmppReturnStatus SetResult(const std::string & code);
XmppReturnStatus SendStanzaError(const XmlElement * element_original,
XmppStanzaError code,
const std::string & text);
virtual void Stop();
virtual bool HandleStanza(const XmlElement * stanza) { return false; }
virtual void OnDisconnect();
virtual int ProcessReponse() { return STATE_DONE; }
void QueueStanza(const XmlElement * stanza);
const XmlElement * NextStanza();
bool MatchResponseIq(const XmlElement * stanza, const Jid & to, const std::string & task_id);
bool MatchRequestIq(const XmlElement * stanza, const std::string & type, const QName & qn);
XmlElement *MakeIqResult(const XmlElement * query);
XmlElement *MakeIq(const std::string & type,
const Jid & to, const std::string task_id);
private:
void StopImpl();
XmppClient * client_;
std::deque<XmlElement *> stanza_queue_;
scoped_ptr<XmlElement> next_stanza_;
std::string id_;
};
}
#endif
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