Line data    Source code

       1             : #pragma once
       2             : 
       3             : #include "envoy/common/time.h"
       4             : #include "envoy/stats/histogram.h"
       5             : #include "envoy/stats/stats.h"
       6             : #include "envoy/stats/timespan.h"
       7             : 
       8             : namespace Envoy {
       9             : namespace Stats {
      10             : 
      11             : /**
      12             :  * An individual timespan that flushes its measured value to the histogram on completion.
      13             :  * The start time is captured on construction. The timespan must be
      14             :  * completed via complete() for it to be stored. If the timespan is deleted this will be treated as
      15             :  * a cancellation. The target histogram must represent a quantity of time.
      16             :  */
      17             : class HistogramCompletableTimespanImpl : public CompletableTimespan {
      18             : public:
      19             :   HistogramCompletableTimespanImpl(Histogram& histogram, TimeSource& time_source);
      20             : 
      21             :   // Stats::CompletableTimespan
      22             :   std::chrono::milliseconds elapsed() const override;
      23             :   void complete() override;
      24             : 
      25             : private:
      26             :   void ensureTimeHistogram(const Histogram& histogram) const;
      27        2901 :   template <typename TimeUnit> TimeUnit elapsedDuration() const {
      28        2901 :     return std::chrono::duration_cast<TimeUnit>(time_source_.monotonicTime() - start_);
      29        2901 :   }
      30             :   uint64_t tickCount() const;
      31             : 
      32             :   TimeSource& time_source_;
      33             :   Histogram& histogram_;
      34             :   const MonotonicTime start_;
      35             : };
      36             : 
      37             : } // namespace Stats
      38             : } // namespace Envoy