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      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 COMPONENTS_POLICY_CORE_COMMON_POLICY_STATISTICS_COLLECTOR_H_
      6 #define COMPONENTS_POLICY_CORE_COMMON_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 #include "components/policy/core/common/policy_details.h"
     13 #include "components/policy/core/common/schema.h"
     14 #include "components/policy/policy_export.h"
     15 
     16 class PrefService;
     17 class PrefRegistrySimple;
     18 
     19 namespace base {
     20 class TaskRunner;
     21 }
     22 
     23 namespace policy {
     24 
     25 class PolicyService;
     26 
     27 // Manages regular updates of policy usage UMA histograms.
     28 class POLICY_EXPORT PolicyStatisticsCollector {
     29  public:
     30   // Policy usage statistics update rate, in milliseconds.
     31   static const int kStatisticsUpdateRate;
     32 
     33   // Neither |policy_service| nor |prefs| can be NULL and must stay valid
     34   // throughout the lifetime of PolicyStatisticsCollector.
     35   PolicyStatisticsCollector(const GetChromePolicyDetailsCallback& get_details,
     36                             const Schema& chrome_schema,
     37                             PolicyService* policy_service,
     38                             PrefService* prefs,
     39                             const scoped_refptr<base::TaskRunner>& task_runner);
     40   virtual ~PolicyStatisticsCollector();
     41 
     42   // Completes initialization and starts periodical statistic updates.
     43   void Initialize();
     44 
     45   static void RegisterPrefs(PrefRegistrySimple* registry);
     46 
     47  protected:
     48   // protected virtual for mocking.
     49   virtual void RecordPolicyUse(int id);
     50 
     51  private:
     52   void CollectStatistics();
     53   void ScheduleUpdate(base::TimeDelta delay);
     54 
     55   GetChromePolicyDetailsCallback get_details_;
     56   Schema chrome_schema_;
     57   PolicyService* policy_service_;
     58   PrefService* prefs_;
     59 
     60   base::CancelableClosure update_callback_;
     61 
     62   const scoped_refptr<base::TaskRunner> task_runner_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(PolicyStatisticsCollector);
     65 };
     66 
     67 }  // namespace policy
     68 
     69 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_STATISTICS_COLLECTOR_H_
     70