NoopTextMapPropagator.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\Context\Propagation;

use OpenTelemetry\Context\Context;
use OpenTelemetry\Context\ContextInterface;
final class NoopTextMapPropagator implements TextMapPropagatorInterface {
    private static ?self $instance = null;
    public static function getInstance() : self {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    public function fields() : array {
        return [];
    }
    public function extract($carrier, ?PropagationGetterInterface $getter = null, ?ContextInterface $context = null) : ContextInterface {
        return $context ?? Context::getCurrent();
    }
    public function inject(&$carrier, ?PropagationSetterInterface $setter = null, ?ContextInterface $context = null) : void {
    }

}