src/remoting/host/host_change_notification_listener.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H
   6 #define REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "remoting/signaling/signal_strategy.h"
  14
  15 namespace buzz {
  16 class XmlElement;
  17 }  // namespace buzz
  18
  19 namespace remoting {
  20
  21 // HostChangeNotificationListener listens for messages from the remoting bot
  22 // indicating that its host entry has been changed in the directory.
  23 // If a message is received indicating that the host was deleted, it uses the
  24 // OnHostDeleted callback to shut down the host.
  25 class HostChangeNotificationListener : public SignalStrategy::Listener {
  26  public:
  27   class Listener {
  28    protected:
  29     virtual ~Listener() {}
  30     // Invoked when a notification that the host was deleted is received.
  31    public:
  32     virtual void OnHostDeleted() = 0;
  33   };
  34
  35   // Both listener and signal_strategy are expected to outlive this object.
  36   HostChangeNotificationListener(Listener* listener,
  37                                  const std::string& host_id,
  38                                  SignalStrategy* signal_strategy,
  39                                  const std::string& directory_bot_jid);
  40   virtual ~HostChangeNotificationListener();
  41
  42   // SignalStrategy::Listener interface.
  43   virtual void OnSignalStrategyStateChange(
  44       SignalStrategy::State state) OVERRIDE;
  45   virtual bool OnSignalStrategyIncomingStanza(
  46       const buzz::XmlElement* stanza) OVERRIDE;
  47
  48  private:
  49   void OnHostDeleted();
  50
  51   Listener* listener_;
  52   std::string host_id_;
  53   SignalStrategy* signal_strategy_;
  54   std::string directory_bot_jid_;
  55   base::WeakPtrFactory<HostChangeNotificationListener> weak_factory_;
  56   DISALLOW_COPY_AND_ASSIGN(HostChangeNotificationListener);
  57 };
  58
  59 }  // namespace remoting
  60
  61 #endif  // REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H