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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\Exemplar;
use OpenTelemetry\Context\ContextInterface;
use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
use function random_int;
final class FixedSizeReservoir implements ExemplarReservoirInterface
{
private BucketStorage $storage;
private int $size;
private int $measurements = 0;
public function __construct(int $size = 4)
{
$this->storage = new BucketStorage($size);
$this->size = $size;
}
public function offer($index, $value, AttributesInterface $attributes, ContextInterface $context, int $timestamp): void
{
$bucket = random_int(0, $this->measurements);
$this->measurements++;
if ($bucket < $this->size) {
$this->storage->store($bucket, $index, $value, $attributes, $context, $timestamp);
}
}
public function collect(array $dataPointAttributes): array
{
$this->measurements = 0;
return $this->storage->collect($dataPointAttributes);
}
}
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