content/browser/tracing/power_tracing_agent.h

   1 // Copyright 2015 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_TRACING_POWER_TRACING_AGENT_H_
   6 #define CONTENT_BROWSER_TRACING_POWER_TRACING_AGENT_H_
   7
   8 #include "base/memory/ref_counted_memory.h"
   9 #include "base/threading/thread.h"
  10
  11 namespace base {
  12 template <typename Type>
  13 struct DefaultSingletonTraits;
  14 }  // namespace base
  15
  16 namespace content {
  17
  18 class BattorPowerTraceProvider;
  19
  20 class PowerTracingAgent {
  21  public:
  22   typedef base::Callback<void(const scoped_refptr<base::RefCountedString>&)>
  23       OutputCallback;
  24
  25   bool StartTracing();
  26   void StopTracing(const OutputCallback& callback);
  27
  28   // Retrieve the singleton instance.
  29   static PowerTracingAgent* GetInstance();
  30
  31  private:
  32   // This allows constructor and destructor to be private and usable only
  33   // by the Singleton class.
  34   friend struct base::DefaultSingletonTraits<PowerTracingAgent>;
  35
  36   // Constructor.
  37   PowerTracingAgent();
  38   virtual ~PowerTracingAgent();
  39
  40   void OnStopTracingDone(const OutputCallback& callback,
  41                          const scoped_refptr<base::RefCountedString>& result);
  42
  43   void FlushOnThread(const OutputCallback& callback);
  44
  45   scoped_ptr<BattorPowerTraceProvider> battor_trace_provider_;
  46   bool is_tracing_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(PowerTracingAgent);
  49 };
  50
  51 }  // namespace content
  52
  53 #endif  // CONTENT_BROWSER_TRACING_POWER_TRACING_AGENT_H_