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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\MetricExporter;
use function array_push;
use OpenTelemetry\SDK\Metrics\AggregationTemporalitySelectorInterface;
use OpenTelemetry\SDK\Metrics\Data\Metric;
use OpenTelemetry\SDK\Metrics\Data\Temporality;
use OpenTelemetry\SDK\Metrics\MetricExporterInterface;
use OpenTelemetry\SDK\Metrics\MetricMetadataInterface;
/**
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk_exporters/in-memory.md
*/
final class InMemoryExporter implements MetricExporterInterface, AggregationTemporalitySelectorInterface
{
/**
* @var list<Metric>
*/
private array $metrics = [];
/**
* @var string|Temporality|null
*/
private $temporality;
private bool $closed = false;
/**
* @param string|Temporality|null $temporality
*/
public function __construct($temporality = null)
{
$this->temporality = $temporality;
}
public function temporality(MetricMetadataInterface $metric)
{
return $this->temporality ?? $metric->temporality();
}
/**
* @return list<Metric>
*/
public function collect(bool $reset = false): array
{
$metrics = $this->metrics;
if ($reset) {
$this->metrics = [];
}
return $metrics;
}
public function export(iterable $batch): bool
{
if ($this->closed) {
return false;
}
/** @psalm-suppress InvalidPropertyAssignmentValue */
array_push($this->metrics, ...$batch);
return true;
}
public function shutdown(): bool
{
if ($this->closed) {
return false;
}
$this->closed = true;
return true;
}
}
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