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<?php namespace Wikimedia\Telemetry; use Wikimedia\Assert\Assert; /** * A {@link SamplerInterface} implementation that samples a given percentage of root spans, * while respecting sampling decisions made by other samplers for a given trace. * * @since 1.43 * @internal */ class ProbabilisticSampler implements SamplerInterface { /** * The chance of sampling a root span, as a percentage (0-100). * @var int */ private int $percentChance; public function __construct( int $percentChance ) { Assert::parameter( $percentChance >= 0 && $percentChance <= 100, '$percentChance', 'must be between 0 and 100 inclusive' ); $this->percentChance = $percentChance; } /** @inheritDoc */ public function shouldSample( ?SpanContext $parentSpanContext ): bool { if ( $parentSpanContext !== null ) { return $parentSpanContext->isSampled(); } return mt_rand( 1, 100 ) <= $this->percentChance; } }
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