PerformanceService.h

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/* -*- 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 http://mozilla.org/MPL/2.0/. */

#ifndef dom_performance_PerformanceService_h

#define dom_performance_PerformanceService_h

#include "mozilla/TimeStamp.h"

#include "nsCOMPtr.h"

#include "nsDOMNavigationTiming.h"

namespace mozilla::dom {

// This class is thread-safe.

// We use this singleton for having the correct value of performance.timeOrigin.

// This value must be calculated on top of the pair:

// - mCreationTimeStamp (monotonic clock)

// - mCreationEpochTime (unix epoch time)

// These 2 values must be taken "at the same time" in order to be used

// correctly.

class PerformanceService {

 public:

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PerformanceService)

  static PerformanceService* GetOrCreate();

  DOMHighResTimeStamp TimeOrigin(const TimeStamp& aCreationTimeStamp) const;

 private:

  PerformanceService();

  ~PerformanceService() = default;

  TimeStamp mCreationTimeStamp;

  PRTime mCreationEpochTime;

};

}  // namespace mozilla::dom

#endif  // dom_performance_PerformanceService_h