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 12 namespace extensions { 13 14 class 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