add addLoggerSubscription method

src/Potter/Logger/Behaviour.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Potter\Logger;
 
 use \Potter\Container;
+use \Potter\Event\Event;
 
 trait Behaviour 
 {
@@ -23,6 +24,7 @@ trait Behaviour
     private static function addLoggerBehaviour(Container $container): void
     {
         self::addLogger($container);
+        self::addLoggerSubscription($container);
     }
     
     private static function addLoggerHandler(Container $container): void
@@ -34,6 +36,30 @@ trait Behaviour
             ->addArgument(\Potter\Console\Logger::class);
     }
     
+    private static function addLoggerSubscription(Container $container): void
+    {
+        if (!static::hasDispatcher($container)) {
+            return;
+        }
+        $dispatcher = static::getDispatcher($container);
+        
+        $dispatcher->subscribeTo('applicationStart', function (Event $event) {
+            $container = $event->getArgument('container');
+            if (!self::hasLogger($container)) {
+                return; }
+            self::getLogger($container)->notice('Application start.');
+        });
+        
+        $dispatcher->subscribeTo('applicationStop', function (Event $event) {
+            $container = $event->getArgument('container');
+            if (!self::hasLogger($container)) {
+                return; }
+            self::getLogger($container)->notice('Application stop.');
+        });
+    }
+    
+    abstract private static function getDispatcher(Container $container): \Potter\Event\Dispatcher;
+    
     private static function getLogger(Container $container): Logger
     {
         return $container->get(Logger::class);
@@ -44,4 +70,10 @@ trait Behaviour
         return [$container->get(Handler::class)];
     }
     
+    abstract private static function hasDispatcher(Container $container): bool;
+    
+    private static function hasLogger(Container $container): bool
+    {
+        return $container->has(Logger::class);
+    }
 }