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<?php
/**
* Class StopWatchEvent.
*
* @package AmpProject\AmpWP
*/
namespace AmpProject\AmpWP\Instrumentation;
/**
* Record the timing of a single event.
*
* @package AmpProject\AmpWP
* @since 2.0
* @internal
*/
final class StopWatchEvent {
/**
* Start time in milliseconds.
*
* @var float
*/
private $start;
/**
* End time in milliseconds.
*
* @var float|null
*/
private $end;
/**
* StopWatchEvent constructor.
*/
public function __construct() {
$this->start = $this->get_now();
}
/**
* Stop the event.
*/
public function stop() {
$this->end = $this->get_now();
}
/**
* Get the duration of the event in milliseconds.
*
* @return float Duration in milliseconds.
*/
public function get_duration() {
if ( null === $this->end ) {
return 0.0;
}
return $this->end - $this->start;
}
/**
* Get the current time in milliseconds.
*
* @return float Current time in milliseconds.
*/
private function get_now() {
return microtime( true ) * 1000;
}
}
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