1 files changed, 64 insertions, 0 deletions
diff --git a/vendor/open-telemetry/sdk/Metrics/StalenessHandler/DelayedStalenessHandlerFactory.php b/vendor/open-telemetry/sdk/Metrics/StalenessHandler/DelayedStalenessHandlerFactory.php
new file mode 100644
index 000000000..0d719c74f
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Metrics/StalenessHandler/DelayedStalenessHandlerFactory.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Metrics\StalenessHandler;
+
+use ArrayAccess;
+use Closure;
+use OpenTelemetry\SDK\Common\Time\ClockInterface;
+use OpenTelemetry\SDK\Common\Util\WeakMap;
+use OpenTelemetry\SDK\Metrics\StalenessHandlerFactoryInterface;
+use OpenTelemetry\SDK\Metrics\StalenessHandlerInterface;
+use Traversable;
+
+final class DelayedStalenessHandlerFactory implements StalenessHandlerFactoryInterface
+{
+    private ClockInterface $clock;
+    private int $nanoDelay;
+
+    private Closure $stale;
+    private Closure $freshen;
+
+    /** @var ArrayAccess<DelayedStalenessHandler, int>&Traversable<DelayedStalenessHandler, int> */
+    private $staleHandlers;
+
+    /**
+     * @param float $delay delay in seconds
+     */
+    public function __construct(ClockInterface $clock, float $delay)
+    {
+        $this->clock = $clock;
+        $this->nanoDelay = (int) ($delay * 1e9);
+
+        $this->stale = function (DelayedStalenessHandler $handler): void {
+            $this->staleHandlers[$handler] = $this->clock->now();
+        };
+        $this->freshen = function (DelayedStalenessHandler $handler): void {
+            unset($this->staleHandlers[$handler]);
+        };
+
+        $this->staleHandlers = WeakMap::create();
+    }
+
+    public function create(): StalenessHandlerInterface
+    {
+        $this->triggerStaleHandlers();
+
+        return new DelayedStalenessHandler($this->stale, $this->freshen);
+    }
+
+    private function triggerStaleHandlers(): void
+    {
+        $expired = $this->clock->now() - $this->nanoDelay;
+        foreach ($this->staleHandlers as $handler => $timestamp) {
+            if ($timestamp > $expired) {
+                break;
+            }
+
+            /** @var DelayedStalenessHandler $handler */
+            unset($this->staleHandlers[$handler]);
+            $handler->triggerStale();
+        }
+    }
+}