39 lines
1.0 KiB
PHP
39 lines
1.0 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 OpenTelemetry\Context\ContextInterface;
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use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
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use function random_int;
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final class FixedSizeReservoir implements ExemplarReservoirInterface
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{
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private BucketStorage $storage;
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private int $size;
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private int $measurements = 0;
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public function __construct(int $size = 4)
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{
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$this->storage = new BucketStorage($size);
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$this->size = $size;
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}
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public function offer($index, $value, AttributesInterface $attributes, ContextInterface $context, int $timestamp): void
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{
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$bucket = random_int(0, $this->measurements);
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$this->measurements++;
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if ($bucket < $this->size) {
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$this->storage->store($bucket, $index, $value, $attributes, $context, $timestamp);
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}
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}
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public function collect(array $dataPointAttributes): array
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{
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$this->measurements = 0;
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return $this->storage->collect($dataPointAttributes);
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}
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}
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