28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
72 lines
2.9 KiB
C++
72 lines
2.9 KiB
C++
/*
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* libjingle
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* Copyright 2011, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_XMPP_PINGTASK_H_
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#define TALK_XMPP_PINGTASK_H_
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#include "talk/base/messagehandler.h"
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#include "talk/base/messagequeue.h"
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#include "talk/xmpp/xmpptask.h"
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namespace buzz {
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// Task to periodically send pings to the server to ensure that the network
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// connection is valid, implementing XEP-0199.
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//
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// This is especially useful on cellular networks because:
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// 1. It keeps the connections alive through the cellular network's NATs or
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// proxies.
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// 2. It detects when the server has crashed or any other case in which the
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// connection has broken without a fin or reset packet being sent to us.
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class PingTask : public buzz::XmppTask, private talk_base::MessageHandler {
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public:
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PingTask(buzz::XmppTaskParentInterface* parent,
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talk_base::MessageQueue* message_queue, uint32 ping_period_millis,
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uint32 ping_timeout_millis);
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virtual bool HandleStanza(const buzz::XmlElement* stanza);
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virtual int ProcessStart();
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// Raised if there is no response to a ping within ping_timeout_millis.
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// The task is automatically aborted after a timeout.
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sigslot::signal0<> SignalTimeout;
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private:
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// Implementation of MessageHandler.
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virtual void OnMessage(talk_base::Message* msg);
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talk_base::MessageQueue* message_queue_;
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uint32 ping_period_millis_;
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uint32 ping_timeout_millis_;
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uint32 next_ping_time_;
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uint32 ping_response_deadline_; // 0 if the response has been received
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};
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} // namespace buzz
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#endif // TALK_XMPP_PINGTASK_H_
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