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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\MetricFactory;
use function array_keys;
use OpenTelemetry\SDK\Common\Instrumentation\InstrumentationScopeInterface;
use OpenTelemetry\SDK\Metrics\Aggregation\ExplicitBucketHistogramAggregation;
use OpenTelemetry\SDK\Metrics\AggregationInterface;
use OpenTelemetry\SDK\Metrics\AttributeProcessor\FilteredAttributeProcessor;
use OpenTelemetry\SDK\Metrics\AttributeProcessorInterface;
use OpenTelemetry\SDK\Metrics\Exemplar\ExemplarFilterInterface;
use OpenTelemetry\SDK\Metrics\Exemplar\ExemplarReservoirInterface;
use OpenTelemetry\SDK\Metrics\Exemplar\FilteredReservoir;
use OpenTelemetry\SDK\Metrics\Exemplar\FixedSizeReservoir;
use OpenTelemetry\SDK\Metrics\Exemplar\HistogramBucketReservoir;
use OpenTelemetry\SDK\Metrics\Instrument;
use OpenTelemetry\SDK\Metrics\MetricFactoryInterface;
use OpenTelemetry\SDK\Metrics\MetricRegistrationInterface;
use OpenTelemetry\SDK\Metrics\MetricRegistry\MetricCollectorInterface;
use OpenTelemetry\SDK\Metrics\MetricRegistry\MetricRegistryInterface;
use OpenTelemetry\SDK\Metrics\Stream\AsynchronousMetricStream;
use OpenTelemetry\SDK\Metrics\Stream\MetricAggregator;
use OpenTelemetry\SDK\Metrics\Stream\MetricAggregatorFactory;
use OpenTelemetry\SDK\Metrics\Stream\MetricStreamInterface;
use OpenTelemetry\SDK\Metrics\Stream\SynchronousMetricStream;
use OpenTelemetry\SDK\Metrics\ViewProjection;
use OpenTelemetry\SDK\Resource\ResourceInfo;
use function serialize;
use function spl_object_id;
use Throwable;
/**
* @internal
*/
final class StreamFactory implements MetricFactoryInterface
{
public function createAsynchronousObserver(
MetricRegistryInterface $registry,
ResourceInfo $resource,
InstrumentationScopeInterface $instrumentationScope,
Instrument $instrument,
int $timestamp,
iterable $views
): array {
$streams = [];
$dedup = [];
foreach ($views as [$view, $registration]) {
if ($view->aggregation === null) {
continue;
}
$dedupId = $this->streamId($view->aggregation, $view->attributeKeys);
if (($streamId = $dedup[$dedupId] ?? null) === null) {
$stream = new AsynchronousMetricStream($view->aggregation, $timestamp);
$streamId = $registry->registerAsynchronousStream($instrument, $stream, new MetricAggregatorFactory(
$this->attributeProcessor($view->attributeKeys),
$view->aggregation,
));
$streams[$streamId] = $stream;
$dedup[$dedupId] = $streamId;
}
$this->registerSource(
$view,
$instrument,
$instrumentationScope,
$resource,
$streams[$streamId],
$registry,
$registration,
$streamId,
);
}
return array_keys($streams);
}
public function createSynchronousWriter(
MetricRegistryInterface $registry,
ResourceInfo $resource,
InstrumentationScopeInterface $instrumentationScope,
Instrument $instrument,
int $timestamp,
iterable $views,
?ExemplarFilterInterface $exemplarFilter = null
): array {
$streams = [];
$dedup = [];
foreach ($views as [$view, $registration]) {
if ($view->aggregation === null) {
continue;
}
$dedupId = $this->streamId($view->aggregation, $view->attributeKeys);
if (($streamId = $dedup[$dedupId] ?? null) === null) {
$stream = new SynchronousMetricStream($view->aggregation, $timestamp);
$streamId = $registry->registerSynchronousStream($instrument, $stream, new MetricAggregator(
$this->attributeProcessor($view->attributeKeys),
$view->aggregation,
$this->createExemplarReservoir($view->aggregation, $exemplarFilter),
));
$streams[$streamId] = $stream;
$dedup[$dedupId] = $streamId;
}
$this->registerSource(
$view,
$instrument,
$instrumentationScope,
$resource,
$streams[$streamId],
$registry,
$registration,
$streamId,
);
}
return array_keys($streams);
}
private function attributeProcessor(
?array $attributeKeys
): ?AttributeProcessorInterface {
return $attributeKeys !== null
? new FilteredAttributeProcessor($attributeKeys)
: null;
}
private function createExemplarReservoir(
AggregationInterface $aggregation,
?ExemplarFilterInterface $exemplarFilter
): ?ExemplarReservoirInterface {
if (!$exemplarFilter) {
return null;
}
if ($aggregation instanceof ExplicitBucketHistogramAggregation && $aggregation->boundaries) {
$exemplarReservoir = new HistogramBucketReservoir($aggregation->boundaries);
} else {
$exemplarReservoir = new FixedSizeReservoir();
}
return new FilteredReservoir($exemplarReservoir, $exemplarFilter);
}
private function registerSource(
ViewProjection $view,
Instrument $instrument,
InstrumentationScopeInterface $instrumentationScope,
ResourceInfo $resource,
MetricStreamInterface $stream,
MetricCollectorInterface $metricCollector,
MetricRegistrationInterface $metricRegistration,
int $streamId
): void {
$provider = new StreamMetricSourceProvider(
$view,
$instrument,
$instrumentationScope,
$resource,
$stream,
$metricCollector,
$streamId,
);
$metricRegistration->register($provider, $provider);
}
private function streamId(AggregationInterface $aggregation, ?array $attributeKeys): string
{
return $this->trySerialize($aggregation) . serialize($attributeKeys);
}
private function trySerialize(object $object)
{
try {
return serialize($object);
} catch (Throwable $e) {
}
return spl_object_id($object);
}
}
|
