src/extensions/browser/api/system_cpu/cpu_info_provider.h

   1 // Copyright 2013 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 EXTENSIONS_BROWSER_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_
   6 #define EXTENSIONS_BROWSER_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_
   7
   8 #include <vector>
   9
  10 #include "base/cpu.h"
  11 #include "base/lazy_instance.h"
  12 #include "extensions/browser/api/system_info/system_info_provider.h"
  13 #include "extensions/common/api/system_cpu.h"
  14
  15 namespace extensions {
  16
  17 class CpuInfoProvider : public SystemInfoProvider {
  18  public:
  19   // Return the single shared instance of CpuInfoProvider.
  20   static CpuInfoProvider* Get();
  21
  22   const core_api::system_cpu::CpuInfo& cpu_info() const { return info_; }
  23
  24   static void InitializeForTesting(scoped_refptr<CpuInfoProvider> provider);
  25
  26  private:
  27   friend class MockCpuInfoProviderImpl;
  28
  29   CpuInfoProvider();
  30   ~CpuInfoProvider() override;
  31
  32   // Platform specific implementation for querying the CPU time information
  33   // for each processor.
  34   virtual bool QueryCpuTimePerProcessor(
  35       std::vector<linked_ptr<core_api::system_cpu::ProcessorInfo> >* infos);
  36
  37   // Overriden from SystemInfoProvider.
  38   bool QueryInfo() override;
  39
  40   // Creates a list of codenames for currently active features.
  41   std::vector<std::string> GetFeatures() const;
  42
  43   // The last information filled up by QueryInfo and is accessed on multiple
  44   // threads, but the whole class is being guarded by SystemInfoProvider base
  45   // class.
  46   //
  47   // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is
  48   // false and on the sequenced worker pool while |is_waiting_for_completion_|
  49   // is true.
  50   core_api::system_cpu::CpuInfo info_;
  51
  52   static base::LazyInstance<scoped_refptr<CpuInfoProvider> > provider_;
  53   base::CPU cpu_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(CpuInfoProvider);
  56 };
  57
  58 }  // namespace extensions
  59
  60 #endif  // EXTENSIONS_BROWSER_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_