66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <chrono>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
/*
|
|
* Represents a monotonic clock suitable for measuring intervals.
|
|
*/
|
|
using TelemetryClock = std::chrono::steady_clock;
|
|
|
|
/*
|
|
* Represents a point in time satisfied the requirements of TelemetryClock.
|
|
*/
|
|
using TelemetryTimePoint = TelemetryClock::time_point;
|
|
|
|
/*
|
|
* Represents a time interval satisfied the requirements of TelemetryClock.
|
|
*/
|
|
using TelemetryDuration = std::chrono::nanoseconds;
|
|
|
|
/*
|
|
* Represents a time point which never happens.
|
|
*/
|
|
static TelemetryTimePoint const kTelemetryUndefinedTimePoint =
|
|
TelemetryTimePoint::max();
|
|
|
|
/*
|
|
* Returns a time point representing the current point in time.
|
|
*/
|
|
static inline TelemetryTimePoint telemetryTimePointNow() {
|
|
return TelemetryClock::now();
|
|
}
|
|
|
|
/*
|
|
* Returns a number of milliseconds that passed from some epoch starting time
|
|
* point to a given time point. The epoch starting time point is not specified
|
|
* but stays the same for an application run.
|
|
*/
|
|
static inline int64_t telemetryTimePointToMilliseconds(
|
|
TelemetryTimePoint timePoint) {
|
|
return std::chrono::duration_cast<std::chrono::milliseconds>(
|
|
timePoint - TelemetryTimePoint{})
|
|
.count();
|
|
}
|
|
|
|
/*
|
|
* Returns a number of milliseconds that represents the given duration object.
|
|
*/
|
|
static inline int64_t telemetryDurationToMilliseconds(
|
|
TelemetryDuration duration) {
|
|
return std::chrono::duration_cast<std::chrono::milliseconds>(duration)
|
|
.count();
|
|
}
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|