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      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 CHROME_BROWSER_METRICS_METRICS_SERVICE_ACCESSOR_H_
      6 #define CHROME_BROWSER_METRICS_METRICS_SERVICE_ACCESSOR_H_
      7 
      8 #include "base/macros.h"
      9 
     10 class MetricsServiceObserver;
     11 
     12 // This class limits and documents access to metrics service helper methods.
     13 // These methods are protected so each user has to inherit own program-specific
     14 // specialization and enable access there by declaring friends.
     15 class MetricsServiceAccessor {
     16  protected:
     17   // Constructor declared as protected to enable inheritance. Decendants should
     18   // disallow instantiation.
     19   MetricsServiceAccessor() {}
     20 
     21   // Registers/unregisters |observer| to receive MetricsLog notifications
     22   // from metrics service.
     23   static void AddMetricsServiceObserver(MetricsServiceObserver* observer);
     24   static void RemoveMetricsServiceObserver(MetricsServiceObserver* observer);
     25 
     26  private:
     27   DISALLOW_COPY_AND_ASSIGN(MetricsServiceAccessor);
     28 };
     29 
     30 #endif  // CHROME_BROWSER_METRICS_METRICS_SERVICE_ACCESSOR_H_
     31