Notify calling web-app when Host plugin becomes connected to a client.

remoting/host/host_status_observer.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_HOST_STATUS_OBSERVER_H_
 #define REMOTING_HOST_STATUS_OBSERVER_H_
 
 #include "base/memory/ref_counted.h"
 
 namespace remoting {
 
 class SignalStrategy;
 
 class HostStatusObserver
     : public base::RefCountedThreadSafe<HostStatusObserver> {
  public:
   HostStatusObserver() { }
 
   // Called on the network thread when status of the XMPP changes.
   virtual void OnSignallingConnected(SignalStrategy* signal_strategy,
                                      const std::string& full_jid) = 0;
   virtual void OnSignallingDisconnected() = 0;
 
+  // Called on the main thread when a client authenticates, or disconnects.
+  // The observer must not tear-down ChromotingHost state on receipt of
+  // this callback; it is purely informational.
+  virtual void OnAuthenticatedClientsChanged(int authenticated_clients) = 0;

[Jamie, 2011/06/10 18:00:38]

Optional: I think that this method is never implemented if the other three are,
and vice versa. Perhaps a separate interface would be better.

[Wez, 2011/06/13 20:30:35]

That certainly makes sense, but currently HostStatusObserver is RefCounted.  I'd
like to fix it to be a pure observer interface before splitting it up.

+
   // Called on the main thread when the host shuts down.
   virtual void OnShutdown() = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<HostStatusObserver>;
   virtual ~HostStatusObserver() { }
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_STATUS_OBSERVER_H_