DllPrefetchExperimentRegistryInfo.h

Enable keyboard shortcuts

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

#ifndef mozilla_DllPrefetchExperimentRegistryInfo_h

#define mozilla_DllPrefetchExperimentRegistryInfo_h

#include "mozilla/Maybe.h"

#include "mozilla/WinHeaderOnlyUtils.h"

#include "nsWindowsHelpers.h"

/**

 * This is a temporary file in order to conduct an experiment on the impact of

 * startup time on retention (see Bug 1640087).

 * This was generally adapted from LauncherRegistryInfo.h

*/

namespace mozilla {

enum class AlteredDllPrefetchMode {

  CurrentPrefetch,

  NoPrefetch,

  OptimizedPrefetch

};

class DllPrefetchExperimentRegistryInfo final {

 public:

  DllPrefetchExperimentRegistryInfo() : mBinPath(GetFullBinaryPath().get()) {}

  ~DllPrefetchExperimentRegistryInfo() {}

  Result<Ok, nsresult> ReflectPrefToRegistry(int32_t aVal);

  Result<Ok, nsresult> ReadRegistryValueData(DWORD expectedType);

  AlteredDllPrefetchMode GetAlteredDllPrefetchMode();

 private:

  Result<Ok, nsresult> Open();

  nsAutoRegKey mRegKey;

  nsString mBinPath;

  int32_t mPrefetchMode;

  static const wchar_t kExperimentSubKeyPath[];

};

}  // namespace mozilla

#endif  // mozilla_DllPrefetchExperimentRegistryInfo_h