From c9cd1b002dc7e9dda002a589b51822faae2af30b Mon Sep 17 00:00:00 2001
From: hussainaliweb <79245466+hussainaliweb@users.noreply.github.com>
Date: Fri, 8 Apr 2022 05:46:11 +0500
Subject: [PATCH] Event.php is added, Also used in Application.php

---
 Application.php | 24 ++++++++++++++++++------
 Event.php       | 26 ++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 6 deletions(-)
 create mode 100644 Event.php

diff --git a/Application.php b/Application.php
index 8b2a3c7..d686cea 100644
--- a/Application.php
+++ b/Application.php
@@ -3,9 +3,8 @@
 namespace hussainalihussain\phpmvclaravelclonecore;
 
 use hussainalihussain\phpmvclaravelclonecore\database\Database;
-use app\models\User;
 
-class Application
+class Application extends Event
 {
     /**
      * @var Router
@@ -65,6 +64,16 @@ public function __construct(string $root_path, array $config = [])
         $this->session       = new Session();
         $this->userClassName = $config['userClassName'] ?? '';
     }
+	
+	public function registerErrorEvent(\Throwable $t)
+    {
+        $this->on(Event::EVENT_ERROR_OCCUR, function() use ($t) {
+            $this->response->setCode($t->getCode());
+            echo $this->view->renderView('_error', [
+                'exception'=> $t
+            ]);
+        });
+    }
 
     /**
      * @return void
@@ -73,14 +82,17 @@ public function run()
     {
         try
         {
+			$this->trigger(EVENT::EVENT_BEFORE_REQUEST);
             echo $this->router->resolve();
         }
         catch (\Exception $e)
         {
-            $this->response->setCode($e->getCode());
-            echo $this->view->renderView('_error', [
-                'exception'=> $e
-            ]);
+            $this->registerErrorEvent($e);
+            $this->trigger(Event::EVENT_ERROR_OCCUR);
+        }
+		finally
+        {
+            $this->trigger(Event::EVENT_AFTER_REQUEST);
         }
     }
 
diff --git a/Event.php b/Event.php
new file mode 100644
index 0000000..c2c976c
--- /dev/null
+++ b/Event.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace app\core;
+
+abstract class Event
+{
+    public const EVENT_BEFORE_REQUEST = 'beforeRequest';
+    public const EVENT_AFTER_REQUEST  = 'afterRequest';
+    public const EVENT_ERROR_OCCUR    = 'errorOccur';
+    protected $eventListeners = [];
+
+    public function on(string $eventName, $callback)
+    {
+        $this->eventListeners[$eventName][] = $callback;
+    }
+
+    public function trigger(string $eventName)
+    {
+        $callbacks = $this->eventListeners[$eventName] ?? [];
+
+        foreach ($callbacks as $callback)
+        {
+            call_user_func($callback);
+        }
+    }
+}
\ No newline at end of file