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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 CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
      6 #define CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/singleton.h"
     10 #include "base/observer_list.h"
     11 #include "base/task_runner.h"
     12 #include "base/timer/timer.h"
     13 #include "content/browser/power_profiler/power_data_provider.h"
     14 #include "content/browser/power_profiler/power_profiler_observer.h"
     15 #include "content/common/content_export.h"
     16 
     17 namespace content {
     18 
     19 // A class used to query power information and notify the observers.
     20 class CONTENT_EXPORT PowerProfilerService {
     21  public:
     22   static PowerProfilerService* GetInstance();
     23 
     24   // Add and remove an observer.
     25   void AddObserver(PowerProfilerObserver* observer);
     26   void RemoveObserver(PowerProfilerObserver* observer);
     27 
     28   bool IsAvailable() const;
     29   std::string GetAccuracyLevel() const;
     30 
     31   virtual ~PowerProfilerService();
     32 
     33  private:
     34   enum Status {
     35     UNINITIALIZED,
     36     INITIALIZED,  // Initialized, profiling has not started.
     37     PROFILING
     38   };
     39 
     40   friend struct DefaultSingletonTraits<PowerProfilerService>;
     41   friend class PowerProfilerServiceTest;
     42 
     43   PowerProfilerService();
     44 
     45   PowerProfilerService(scoped_ptr<PowerDataProvider> provider,
     46                        scoped_refptr<base::TaskRunner> task_runner,
     47                        const base::TimeDelta& sample_period);
     48 
     49   void Start();
     50   void Stop();
     51 
     52   // Query power data from PowerDataProvider, executes on the WorkerPool thread.
     53   void QueryDataOnTaskRunner();
     54 
     55   // Initiate the query on the UI thread, the task is delegated to
     56   // QueryDataOnTaskRunner.
     57   void QueryData();
     58 
     59   // Executes on the UI thread.
     60   void Notify(const PowerEventVector&);
     61 
     62   base::RepeatingTimer<PowerProfilerService> query_power_timer_;
     63   scoped_refptr<base::TaskRunner> task_runner_;
     64 
     65   Status status_;
     66 
     67   // Sampling period of power data measurement.
     68   base::TimeDelta sample_period_;
     69   ObserverList<PowerProfilerObserver> observers_;
     70 
     71   scoped_ptr<PowerDataProvider> data_provider_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(PowerProfilerService);
     74 };
     75 
     76 }  // namespace content
     77 
     78 #endif  // CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
     79