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<?php
declare(strict_types=1);
namespace OpenTelemetry\Context\Propagation;
use OpenTelemetry\Context\ContextInterface;
/**
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/v1.6.1/specification/context/api-propagators.md#textmap-propagator
*/
interface TextMapPropagatorInterface
{
/**
* Returns list of fields that will be used by this propagator.
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/v1.6.1/specification/context/api-propagators.md#fields
*
* @return list<string>
*/
public function fields() : array;
/**
* Injects specific values from the provided {@see ContextInterface} into the provided carrier
* via an {@see PropagationSetterInterface}.
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/v1.6.1/specification/context/api-propagators.md#textmap-inject
*
* @param mixed $carrier
*/
public function inject(&$carrier, PropagationSetterInterface $setter = null, ContextInterface $context = null): void;
/**
* Extracts specific values from the provided carrier into the provided {@see ContextInterface}
* via an {@see PropagationGetterInterface}.
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/v1.6.1/specification/context/api-propagators.md#textmap-extract
*/
public function extract($carrier, PropagationGetterInterface $getter = null, ContextInterface $context = null): ContextInterface;
}
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