src/chrome/browser/extensions/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 CHROME_BROWSER_EXTENSIONS_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_
   6 #define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_
   7
   8 #include "base/lazy_instance.h"
   9 #include "chrome/browser/extensions/api/system_info/system_info_provider.h"
  10 #include "chrome/common/extensions/api/system_cpu.h"
  11
  12 namespace extensions {
  13
  14 class CpuInfoProvider : public SystemInfoProvider {
  15  public:
  16   // Return the single shared instance of CpuInfoProvider.
  17   static CpuInfoProvider* Get();
  18
  19   const api::system_cpu::CpuInfo& cpu_info() const;
  20
  21   static void InitializeForTesting(scoped_refptr<CpuInfoProvider> provider);
  22
  23  private:
  24   friend class MockCpuInfoProviderImpl;
  25
  26   CpuInfoProvider();
  27   virtual ~CpuInfoProvider();
  28
  29   // Overriden from SystemInfoProvider.
  30   virtual bool QueryInfo() OVERRIDE;
  31
  32   // The last information filled up by QueryInfo and is accessed on multiple
  33   // threads, but the whole class is being guarded by SystemInfoProvider base
  34   // class.
  35   //
  36   // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is
  37   // false and on the sequenced worker pool while |is_waiting_for_completion_|
  38   // is true.
  39   api::system_cpu::CpuInfo info_;
  40
  41   static base::LazyInstance<scoped_refptr<CpuInfoProvider> > provider_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(CpuInfoProvider);
  44 };
  45
  46 }  // namespace extensions
  47
  48 #endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_CPU_CPU_INFO_PROVIDER_H_