added listener interface

Author: Spamercz

src/EventManager/ListenerInterface.php

@@ -0,0 +1,21 @@
+<?php declare(strict_types = 1);
+
+namespace Spameri\Elastic\EventManager;
+
+interface ListenerInterface
+{
+
+	public function handle(
+		object|null $entity,
+		object|null $parent,
+	): void;
+
+	/**
+	 * @return array<class-string>
+	 */
+	public function getEntityClass(): array;
+
+
+	public function getEvent(): string;
+
+}