PerformanceService.h (1301B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef dom_performance_PerformanceService_h 8 #define dom_performance_PerformanceService_h 9 10 #include "mozilla/TimeStamp.h" 11 #include "nsCOMPtr.h" 12 #include "nsDOMNavigationTiming.h" 13 14 namespace mozilla::dom { 15 16 // This class is thread-safe. 17 18 // We use this singleton for having the correct value of performance.timeOrigin. 19 // This value must be calculated on top of the pair: 20 // - mCreationTimeStamp (monotonic clock) 21 // - mCreationEpochTime (unix epoch time) 22 // These 2 values must be taken "at the same time" in order to be used 23 // correctly. 24 25 class PerformanceService { 26 public: 27 NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PerformanceService) 28 29 static PerformanceService* GetOrCreate(); 30 31 DOMHighResTimeStamp TimeOrigin(const TimeStamp& aCreationTimeStamp) const; 32 33 private: 34 PerformanceService(); 35 ~PerformanceService() = default; 36 37 TimeStamp mCreationTimeStamp; 38 PRTime mCreationEpochTime; 39 }; 40 41 } // namespace mozilla::dom 42 43 #endif // dom_performance_PerformanceService_h