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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Common\Time;
use function hrtime;
use function microtime;
final class SystemClock implements ClockInterface
{
private static int $referenceTime = 0;
public function __construct()
{
self::init();
}
public static function create(): self
{
return new self();
}
/** @inheritDoc */
public function now(): int
{
return self::$referenceTime + hrtime(true);
}
private static function init(): void
{
if (self::$referenceTime > 0) {
return;
}
self::$referenceTime = self::calculateReferenceTime(
microtime(true),
hrtime(true)
);
}
/**
* Calculates the reference time which is later used to calculate the current wall clock time in nanoseconds by adding the current uptime.
*/
private static function calculateReferenceTime(float $wallClockMicroTime, int $upTime): int
{
return ((int) ($wallClockMicroTime * ClockInterface::NANOS_PER_SECOND)) - $upTime;
}
}
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