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<?php
declare(strict_types=1);
namespace OpenTracing;
use IteratorAggregate;
/**
* SpanContext must be immutable in order to avoid complicated lifetime
* issues around Span finish and references.
*
* Baggage items are key => value string pairs that apply to the given Span,
* its SpanContext, and all Spans which directly or transitively reference
* the local Span. That is, baggage items propagate in-band along with the
* trace itself.
*/
interface SpanContext extends IteratorAggregate
{
/**
* Returns the value of a baggage item based on its key. If there is no
* value with such key it will return null.
*
* @param string $key
* @return string|null
*/
public function getBaggageItem(string $key): ?string;
/**
* Creates a new SpanContext out of the existing one and the new key => value pair.
*
* @param string $key
* @param string $value
* @return SpanContext
*/
public function withBaggageItem(string $key, string $value): SpanContext;
}
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