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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\Stream;
use OpenTelemetry\Context\ContextInterface;
use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
use OpenTelemetry\SDK\Metrics\AggregationInterface;
use OpenTelemetry\SDK\Metrics\AttributeProcessorInterface;
use OpenTelemetry\SDK\Metrics\Exemplar\ExemplarReservoirInterface;
use function serialize;
/**
* @internal
*/
final class MetricAggregator implements MetricAggregatorInterface
{
private ?AttributeProcessorInterface $attributeProcessor;
private AggregationInterface $aggregation;
private ?ExemplarReservoirInterface $exemplarReservoir;
/** @var array<AttributesInterface> */
private array $attributes = [];
private array $summaries = [];
public function __construct(
?AttributeProcessorInterface $attributeProcessor,
AggregationInterface $aggregation,
?ExemplarReservoirInterface $exemplarReservoir = null
) {
$this->attributeProcessor = $attributeProcessor;
$this->aggregation = $aggregation;
$this->exemplarReservoir = $exemplarReservoir;
}
/**
* @param float|int $value
*/
public function record($value, AttributesInterface $attributes, ContextInterface $context, int $timestamp): void
{
$filteredAttributes = $this->attributeProcessor !== null
? $this->attributeProcessor->process($attributes, $context)
: $attributes;
$raw = $filteredAttributes->toArray();
$index = $raw !== [] ? serialize($raw) : 0;
$this->attributes[$index] ??= $filteredAttributes;
$this->aggregation->record(
$this->summaries[$index] ??= $this->aggregation->initialize(),
$value,
$attributes,
$context,
$timestamp,
);
if ($this->exemplarReservoir !== null) {
$this->exemplarReservoir->offer($index, $value, $attributes, $context, $timestamp);
}
}
public function collect(int $timestamp): Metric
{
$exemplars = $this->exemplarReservoir
? $this->exemplarReservoir->collect($this->attributes)
: [];
$metric = new Metric($this->attributes, $this->summaries, $timestamp, $exemplars);
$this->attributes = [];
$this->summaries = [];
return $metric;
}
}
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