1 files changed, 38 insertions, 0 deletions
diff --git a/vendor/open-telemetry/sdk/Metrics/Exemplar/FixedSizeReservoir.php b/vendor/open-telemetry/sdk/Metrics/Exemplar/FixedSizeReservoir.php
new file mode 100644
index 000000000..479292a4c
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Metrics/Exemplar/FixedSizeReservoir.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Metrics\Exemplar;
+
+use OpenTelemetry\Context\ContextInterface;
+use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
+use function random_int;
+
+final class FixedSizeReservoir implements ExemplarReservoirInterface
+{
+    private BucketStorage $storage;
+    private int $size;
+    private int $measurements = 0;
+
+    public function __construct(int $size = 4)
+    {
+        $this->storage = new BucketStorage($size);
+        $this->size = $size;
+    }
+
+    public function offer($index, $value, AttributesInterface $attributes, ContextInterface $context, int $timestamp): void
+    {
+        $bucket = random_int(0, $this->measurements);
+        $this->measurements++;
+        if ($bucket < $this->size) {
+            $this->storage->store($bucket, $index, $value, $attributes, $context, $timestamp);
+        }
+    }
+
+    public function collect(array $dataPointAttributes): array
+    {
+        $this->measurements = 0;
+
+        return $this->storage->collect($dataPointAttributes);
+    }
+}