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