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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics;
use OpenTelemetry\API\Metrics\ObservableCallbackInterface;
use OpenTelemetry\SDK\Metrics\MetricRegistry\MetricWriterInterface;
/**
* @internal
*/
final class ObservableCallback implements ObservableCallbackInterface
{
private MetricWriterInterface $writer;
private ReferenceCounterInterface $referenceCounter;
private ?int $callbackId;
private ?ObservableCallbackDestructor $callbackDestructor;
/** @phpstan-ignore-next-line */
private ?object $target;
public function __construct(MetricWriterInterface $writer, ReferenceCounterInterface $referenceCounter, int $callbackId, ?ObservableCallbackDestructor $callbackDestructor, ?object $target)
{
$this->writer = $writer;
$this->referenceCounter = $referenceCounter;
$this->callbackId = $callbackId;
$this->callbackDestructor = $callbackDestructor;
$this->target = $target;
}
public function detach(): void
{
if ($this->callbackId === null) {
return;
}
$this->writer->unregisterCallback($this->callbackId);
$this->referenceCounter->release();
if ($this->callbackDestructor !== null) {
unset($this->callbackDestructor->callbackIds[$this->callbackId]);
}
$this->callbackId = null;
}
public function __destruct()
{
if ($this->callbackDestructor !== null) {
return;
}
if ($this->callbackId === null) {
return;
}
$this->referenceCounter->acquire(true);
$this->referenceCounter->release();
}
}
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