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