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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_API_SYSTEM_MEMORY_MEMORY_INFO_PROVIDER_H_
#define EXTENSIONS_BROWSER_API_SYSTEM_MEMORY_MEMORY_INFO_PROVIDER_H_
#include "base/lazy_instance.h"
#include "extensions/browser/api/system_info/system_info_provider.h"
#include "extensions/common/api/system_memory.h"
namespace extensions {
class MemoryInfoProvider : public SystemInfoProvider {
public:
MemoryInfoProvider(const MemoryInfoProvider&) = delete;
MemoryInfoProvider& operator=(const MemoryInfoProvider&) = delete;
static MemoryInfoProvider* Get();
const api::system_memory::MemoryInfo& memory_info() const { return info_; }
static void InitializeForTesting(scoped_refptr<MemoryInfoProvider> provider);
private:
friend class MockMemoryInfoProviderImpl;
MemoryInfoProvider() = default;
~MemoryInfoProvider() override = default;
// Overriden from SystemInfoProvider.
bool QueryInfo() override;
// The last information filled up by QueryInfo and is accessed on multiple
// threads, but the whole class is being guarded by SystemInfoProvider base
// class.
//
// `info_` is accessed on the UI thread while `is_waiting_for_completion_` is
// false and on the sequenced worker pool while `is_waiting_for_completion_`
// is true.
api::system_memory::MemoryInfo info_;
static base::LazyInstance<scoped_refptr<MemoryInfoProvider>>::DestructorAtExit
provider_;
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_SYSTEM_MEMORY_MEMORY_INFO_PROVIDER_H_
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