93 lines
2.7 KiB
PHP
93 lines
2.7 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace OpenTelemetry\SDK\Metrics\Exemplar;
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use function array_fill;
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use function assert;
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use function count;
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use OpenTelemetry\API\Trace\Span;
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use OpenTelemetry\Context\ContextInterface;
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use OpenTelemetry\SDK\Common\Attribute\Attributes;
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use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
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use OpenTelemetry\SDK\Metrics\Data\Exemplar;
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/**
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* @internal
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*/
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final class BucketStorage
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{
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/** @var array<int, BucketEntry|null> */
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private array $buckets;
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public function __construct(int $size = 0)
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{
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$this->buckets = array_fill(0, $size, null);
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}
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/**
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* @param int|string $index
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* @param float|int $value
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*/
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public function store(int $bucket, $index, $value, AttributesInterface $attributes, ContextInterface $context, int $timestamp): void
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{
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assert($bucket <= count($this->buckets));
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$exemplar = $this->buckets[$bucket] ??= new BucketEntry();
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$exemplar->index = $index;
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$exemplar->value = $value;
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$exemplar->timestamp = $timestamp;
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$exemplar->attributes = $attributes;
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if (($spanContext = Span::fromContext($context)->getContext())->isValid()) {
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$exemplar->traceId = $spanContext->getTraceId();
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$exemplar->spanId = $spanContext->getSpanId();
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} else {
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$exemplar->traceId = null;
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$exemplar->spanId = null;
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}
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}
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/**
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* @param array<AttributesInterface> $dataPointAttributes
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* @return array<Exemplar>
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*/
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public function collect(array $dataPointAttributes): array
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{
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$exemplars = [];
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foreach ($this->buckets as $index => &$exemplar) {
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if (!$exemplar) {
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continue;
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}
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$exemplars[$index] = new Exemplar(
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$exemplar->index,
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$exemplar->value,
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$exemplar->timestamp,
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$this->filterExemplarAttributes(
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$dataPointAttributes[$exemplar->index],
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$exemplar->attributes,
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),
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$exemplar->traceId,
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$exemplar->spanId,
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);
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$exemplar = null;
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}
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return $exemplars;
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}
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private function filterExemplarAttributes(AttributesInterface $dataPointAttributes, AttributesInterface $exemplarAttributes): AttributesInterface
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{
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$attributes = [];
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foreach ($exemplarAttributes as $key => $value) {
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if ($dataPointAttributes->get($key) === null) {
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$attributes[$key] = $value;
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}
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}
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return new Attributes($attributes, $exemplarAttributes->getDroppedAttributesCount());
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}
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}
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