Extracted real-time update topic names to an enum

module/Core/src/EventDispatcher/Topic.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Core\EventDispatcher;
+
+use function sprintf;
+
+enum Topic: string
+{
+    case NEW_VISIT = 'https://shlink.io/new-visit';
+    case NEW_ORPHAN_VISIT = 'https://shlink.io/new-orphan-visit';
+    case NEW_SHORT_URL = 'https://shlink.io/new-short-url';
+
+    public static function newShortUrlVisit(?string $shortCode): string
+    {
+        return sprintf('%s/%s', self::NEW_VISIT->value, $shortCode ?? '');
+    }
+}