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<?php declare( strict_types = 1 ); namespace Wikimedia\Parsoid\Utils; /** * A helper class to make it easier to compute timing metrics. */ class Timing { /** * This is typically a StatsdDataFactoryInterface, but really could be * anything which has a `timing()` method. Set it to `null` to disable * metrics. * * @var ?object */ private $metrics; /* @var float */ private $startTime; /** * @param ?object $metrics */ private function __construct( ?object $metrics ) { $this->metrics = $metrics; $this->startTime = $metrics ? self::millis() : 0; /* will not be used */ } /** * Return the current number of milliseconds since the epoch, as a float. * @return float */ public static function millis(): float { return 1000 * microtime( true ); } /** * End this timing measurement, reporting it under the given `name`. * @param string $name * @return float Number of milliseconds reported */ public function end( string $name ): float { $elapsed = self::millis() - $this->startTime; if ( $this->metrics ) { $this->metrics->timing( $name, $elapsed ); } return $elapsed; } /** * Start a timing measurement, logging it to the given `$metrics` object * (which just needs to have a `timing()` method). * @param ?object $metrics * @return Timing */ public static function start( ?object $metrics ): Timing { return new Timing( $metrics ); } }
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