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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\StalenessHandler;
use function assert;
use Closure;
use OpenTelemetry\SDK\Metrics\ReferenceCounterInterface;
use OpenTelemetry\SDK\Metrics\StalenessHandlerInterface;
/**
* @internal
*/
final class DelayedStalenessHandler implements StalenessHandlerInterface, ReferenceCounterInterface
{
private Closure $stale;
private Closure $freshen;
/** @var Closure[]|null */
private ?array $onStale = [];
private int $count = 0;
public function __construct(Closure $stale, Closure $freshen)
{
$this->stale = $stale;
$this->freshen = $freshen;
}
public function acquire(bool $persistent = false): void
{
if ($this->count === 0) {
($this->freshen)($this);
}
$this->count++;
if ($persistent) {
$this->onStale = null;
}
}
public function release(): void
{
if (--$this->count || $this->onStale === null) {
return;
}
($this->stale)($this);
}
public function onStale(Closure $callback): void
{
if ($this->onStale === null) {
return;
}
$this->onStale[] = $callback;
}
public function triggerStale(): void
{
assert($this->onStale !== null);
$callbacks = $this->onStale;
$this->onStale = [];
foreach ($callbacks as $callback) {
$callback();
}
}
}
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