src/chrome/browser/policy/policy_statistics_collector.h

   1 // Copyright (c) 2012 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_POLICY_POLICY_STATISTICS_COLLECTOR_H_
   6 #define CHROME_BROWSER_POLICY_POLICY_STATISTICS_COLLECTOR_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/cancelable_callback.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/time/time.h"
  12
  13 class PrefService;
  14 class PrefRegistrySimple;
  15
  16 namespace base {
  17 class TaskRunner;
  18 }
  19
  20 namespace policy {
  21
  22 class PolicyService;
  23
  24 // Manages regular updates of policy usage UMA histograms.
  25 class PolicyStatisticsCollector {
  26  public:
  27   // Policy usage statistics update rate, in milliseconds.
  28   static const int kStatisticsUpdateRate;
  29
  30   // Neither |policy_service| nor |prefs| can be NULL and must stay valid
  31   // throughout the lifetime of PolicyStatisticsCollector.
  32   PolicyStatisticsCollector(PolicyService* policy_service,
  33                             PrefService* prefs,
  34                             const scoped_refptr<base::TaskRunner>& task_runner);
  35   virtual ~PolicyStatisticsCollector();
  36
  37   // Completes initialization and starts periodical statistic updates.
  38   void Initialize();
  39
  40   static void RegisterPrefs(PrefRegistrySimple* registry);
  41
  42  protected:
  43   // protected virtual for mocking.
  44   virtual void RecordPolicyUse(int id);
  45
  46  private:
  47   void CollectStatistics();
  48   void ScheduleUpdate(base::TimeDelta delay);
  49
  50   PolicyService* policy_service_;
  51   PrefService* prefs_;
  52
  53   base::CancelableClosure update_callback_;
  54
  55   const scoped_refptr<base::TaskRunner> task_runner_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(PolicyStatisticsCollector);
  58 };
  59
  60 }  // namespace policy
  61
  62 #endif  // CHROME_BROWSER_POLICY_POLICY_STATISTICS_COLLECTOR_H_