perf: Re-use empty resource instance (open-telemetry#1251)

brettmc · Mar 12, 2024 · 01c46a2 · 01c46a2
1 parent bb07aca
commit 01c46a2
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/src/SDK/Resource/ResourceInfoFactory.php b/src/SDK/Resource/ResourceInfoFactory.php
@@ -17,6 +17,8 @@ class ResourceInfoFactory
 {
     use LogsMessagesTrait;
 
+    private static ?ResourceInfo $emptyResource = null;
+
     public static function defaultResource(): ResourceInfo
     {
         $detectors = Configuration::getList(Env::OTEL_PHP_DETECTORS);
@@ -90,6 +92,10 @@ public static function defaultResource(): ResourceInfo
 
     public static function emptyResource(): ResourceInfo
     {
-        return ResourceInfo::create(Attributes::create([]));
+        if (null === self::$emptyResource) {
+            self::$emptyResource = ResourceInfo::create(Attributes::create([]));
+        }
+
+        return self::$emptyResource;
     }
 }