Line data    Source code

       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 {
      15             : namespace dom {
      16             : 
      17             : // This class is thread-safe.
      18             : 
      19             : // We use this singleton for having the correct value of performance.timeOrigin.
      20             : // This value must be calculated on top of the pair:
      21             : // - mCreationTimeStamp (monotonic clock)
      22             : // - mCreationEpochTime (unix epoch time)
      23             : // These 2 values must be taken "at the same time" in order to be used
      24             : // correctly.
      25             : 
      26             : class PerformanceService
      27             : {
      28             : public:
      29           0 :   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PerformanceService)
      30             : 
      31             :   static PerformanceService*
      32             :   GetOrCreate();
      33             : 
      34             :   DOMHighResTimeStamp
      35             :   TimeOrigin(const TimeStamp& aCreationTimeStamp) const;
      36             : 
      37             : private:
      38             :   PerformanceService();
      39             :   ~PerformanceService() = default;
      40             : 
      41             :   TimeStamp mCreationTimeStamp;
      42             :   PRTime mCreationEpochTime;
      43             : };
      44             : 
      45             : } // dom namespace
      46             : } // mozilla namespace
      47             : 
      48             : #endif // dom_performance_PerformanceService_h