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
12namespace extensions {
13
14class 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_
49