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_MEMORY_MEMORY_INFO_PROVIDER_H_
6#define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_MEMORY_MEMORY_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_memory.h"
11
12namespace extensions {
13
14class MemoryInfoProvider : public SystemInfoProvider {
15 public:
16  static MemoryInfoProvider* Get();
17
18  const api::system_memory::MemoryInfo& memory_info() const;
19
20  static void InitializeForTesting(scoped_refptr<MemoryInfoProvider> provider);
21
22 private:
23  friend class MockMemoryInfoProviderImpl;
24
25  MemoryInfoProvider();
26  virtual ~MemoryInfoProvider();
27
28  // Overriden from SystemInfoProvider.
29  virtual bool QueryInfo() OVERRIDE;
30
31  // The last information filled up by QueryInfo and is accessed on multiple
32  // threads, but the whole class is being guarded by SystemInfoProvider base
33  // class.
34  //
35  // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is
36  // false and on the sequenced worker pool while |is_waiting_for_completion_|
37  // is true.
38  api::system_memory::MemoryInfo info_;
39
40  static base::LazyInstance<scoped_refptr<MemoryInfoProvider> > provider_;
41
42  DISALLOW_COPY_AND_ASSIGN(MemoryInfoProvider);
43};
44
45}  // namespace extensions
46
47#endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_MEMORY_MEMORY_INFO_PROVIDER_H_
48