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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();
     29 
     30   virtual ~PowerProfilerService();
     31 
     32  private:
     33   enum Status {
     34     UNINITIALIZED,
     35     INITIALIZED,  // Initialized, profiling has not started.
     36     PROFILING
     37   };
     38 
     39   friend struct DefaultSingletonTraits<PowerProfilerService>;
     40   friend class PowerProfilerServiceTest;
     41 
     42   PowerProfilerService();
     43 
     44   PowerProfilerService(scoped_ptr<PowerDataProvider> provider,
     45                        scoped_refptr<base::TaskRunner> task_runner,
     46                        const base::TimeDelta& sample_period);
     47 
     48   void Start();
     49   void Stop();
     50 
     51   // Query power data from PowerDataProvider, executes on the WorkerPool thread.
     52   void QueryDataOnTaskRunner();
     53 
     54   // Initiate the query on the UI thread, the task is delegated to
     55   // QueryDataOnTaskRunner.
     56   void QueryData();
     57 
     58   // Executes on the UI thread.
     59   void Notify(const PowerEventVector&);
     60 
     61   base::RepeatingTimer<PowerProfilerService> query_power_timer_;
     62   scoped_refptr<base::TaskRunner> task_runner_;
     63 
     64   Status status_;
     65 
     66   // Sampling period of power data measurement.
     67   base::TimeDelta sample_period_;
     68   ObserverList<PowerProfilerObserver> observers_;
     69 
     70   scoped_ptr<PowerDataProvider> data_provider_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(PowerProfilerService);
     73 };
     74 
     75 }  // namespace content
     76 
     77 #endif  // CONTENT_BROWSER_POWER_PROFILER_POWER_PROFILER_SERVICE_H_
     78