components/metrics/metrics_service_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_METRICS_METRICS_SERVICE_OBSERVER_H_
   6 #define COMPONENTS_METRICS_METRICS_SERVICE_OBSERVER_H_
   7
   8 #include "base/macros.h"
   9
  10 namespace metrics {
  11
  12 // MetricsServiceObserver receives notifications from MetricsService.
  13 // An observer must be added, removed, and notified on the same thread.
  14 class MetricsServiceObserver {
  15  public:
  16   // Called when a new MetricsLog is created.
  17   virtual void OnDidCreateMetricsLog() = 0;
  18
  19  protected:
  20   MetricsServiceObserver();
  21   virtual ~MetricsServiceObserver();
  22
  23  private:
  24   DISALLOW_COPY_AND_ASSIGN(MetricsServiceObserver);
  25 };
  26
  27 }  // namespace metrics
  28
  29 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_OBSERVER_H_