Extracted middleware and handlers

src/Broker/SubscriptionList.php

@@ -2,10 +2,13 @@
 
 namespace NoccyLabs\Mercureact\Broker;
 
+use ArrayIterator;
 use Countable;
+use IteratorAggregate;
 use SplObjectStorage;
+use Traversable;
 
-class SubscriptionList implements Countable
+class SubscriptionList implements Countable, IteratorAggregate
 {
 
     private array $subscriptions = [];
@@ -16,5 +19,10 @@ class SubscriptionList implements Countable
     {
         return count($this->subscriptions);
     }
+
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator($this->subscriptions);
+    }
 }