components/copresence/public/copresence_observer.h

   1 // Copyright 2014 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 COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_OBSERVER_H_
   6 #define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_OBSERVER_H_
   7
   8 namespace copresence {
   9
  10 class Directive;
  11 struct TransmittedToken;
  12 struct ReceivedToken;
  13
  14 // Implement this interface to be notified of changes
  15 // to the state of the copresence component.
  16 // TODO(ckehoe): Create a LoggingObserver based on this that replaces
  17 // equivalent logging elsewhere. Then we know what state is being recorded.
  18 class CopresenceObserver {
  19  public:
  20   // Called when the list of active directives has changed.
  21   virtual void DirectivesUpdated() = 0;
  22
  23   // Called when a token is transmitted.
  24   virtual void TokenTransmitted(const TransmittedToken& token) = 0;
  25
  26   // Called when a token is received.
  27   virtual void TokenReceived(const ReceivedToken& token) = 0;
  28
  29  protected:
  30   virtual ~CopresenceObserver() {}
  31 };
  32
  33 }  // namespace copresence
  34
  35 #endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_OBSERVER_H_