added a priority to the event dispatcher listeners

src/Symfony/Bundle/FrameworkBundle/Debug/ExceptionListener.php

@@ -39,10 +39,11 @@ class ExceptionListener
      * Registers a core.exception listener.
      *
      * @param EventDispatcher $dispatcher An EventDispatcher instance
+     * @param integer         $priority   The priority
      */
-    public function register(EventDispatcher $dispatcher)
+    public function register(EventDispatcher $dispatcher, $priority = 0)
     {
-        $dispatcher->connect('core.exception', array($this, 'handle'));
+        $dispatcher->connect('core.exception', array($this, 'handle'), $priority);
     }
 
     public function handle(Event $event)

src/Symfony/Bundle/FrameworkBundle/RequestListener.php

@@ -37,10 +37,11 @@ class RequestListener
      * Registers a core.request listener.
      *
      * @param EventDispatcher $dispatcher An EventDispatcher instance
+     * @param integer         $priority   The priority
      */
-    public function register(EventDispatcher $dispatcher)
+    public function register(EventDispatcher $dispatcher, $priority = 0)
     {
-        $dispatcher->connect('core.request', array($this, 'resolve'));
+        $dispatcher->connect('core.request', array($this, 'resolve'), $priority);
     }
 
     public function resolve(Event $event)

src/Symfony/Bundle/FrameworkBundle/Resources/config/web.xml

@@ -46,7 +46,7 @@
         </service>
 
         <service id="exception_listener" class="%exception_listener.class%">
-            <tag name="kernel.listener" />
+            <tag name="kernel.listener" priority="128" />
             <argument type="service" id="service_container" />
             <argument>%exception_listener.controller%</argument>
             <argument type="service" id="logger" on-invalid="null" />

src/Symfony/Component/EventDispatcher/EventDispatcher.php

@@ -26,14 +26,15 @@ class EventDispatcher
      *
      * @param string  $name      An event name
      * @param mixed   $listener  A PHP callable
+     * @param integer $priority  The priority (between -10 and 10 -- defaults to 0)
      */
-    public function connect($name, $listener)
+    public function connect($name, $listener, $priority = 0)
     {
-        if (!isset($this->listeners[$name])) {
-            $this->listeners[$name] = array();
+        if (!isset($this->listeners[$name][$priority])) {
+            $this->listeners[$name][$priority] = array();
         }
 
-        $this->listeners[$name][] = $listener;
+        $this->listeners[$name][$priority][] = $listener;
     }
 
     /**
@@ -50,9 +51,11 @@ class EventDispatcher
             return false;
         }
 
-        foreach ($this->listeners[$name] as $i => $callable) {
-            if ($listener === $callable) {
-                unset($this->listeners[$name][$i]);
+        foreach ($this->listeners[$name] as $priority => $callables) {
+            foreach ($callables as $i => $callable) {
+                if ($listener === $callable) {
+                    unset($this->listeners[$name][$priority][$i]);
+                }
             }
         }
     }
@@ -120,11 +123,7 @@ class EventDispatcher
      */
     public function hasListeners($name)
     {
-        if (!isset($this->listeners[$name])) {
-            $this->listeners[$name] = array();
-        }
-
-        return (boolean) count($this->listeners[$name]);
+        return (Boolean) count($this->getListeners($name));
     }
 
     /**
@@ -140,6 +139,13 @@ class EventDispatcher
             return array();
         }
 
-        return $this->listeners[$name];
+        $listeners = array();
+        $all = $this->listeners[$name];
+        ksort($all);
+        foreach ($all as $l) {
+            $listeners = array_merge($listeners, $l);
+        }
+
+        return $listeners;
     }
 }

src/Symfony/Component/HttpKernel/Cache/EsiListener.php

@@ -39,12 +39,13 @@ class EsiListener
      * Registers a core.response listener to add the Surrogate-Control header to a Response when needed.
      *
      * @param EventDispatcher $dispatcher An EventDispatcher instance
+     * @param integer         $priority   The priority
      */
-    public function register(EventDispatcher $dispatcher)
+    public function register(EventDispatcher $dispatcher, $priority = 0)
     {
         if (null !== $this->esi)
         {
-            $dispatcher->connect('core.response', array($this, 'filter'));
+            $dispatcher->connect('core.response', array($this, 'filter'), $priority);
         }
     }
 

src/Symfony/Component/HttpKernel/Profiler/ProfilerListener.php

@@ -34,10 +34,11 @@ class ProfilerListener
      * Registers a core.response listener.
      *
      * @param EventDispatcher $dispatcher An EventDispatcher instance
+     * @param integer         $priority   The priority
      */
-    public function register(EventDispatcher $dispatcher)
+    public function register(EventDispatcher $dispatcher, $priority = 0)
     {
-        $dispatcher->connect('core.response', array($this, 'handle'));
+        $dispatcher->connect('core.response', array($this, 'handle'), $priority);
     }
 
     public function handle(Event $event, Response $response)

src/Symfony/Component/HttpKernel/Profiler/WebDebugToolbarListener.php

@@ -35,10 +35,11 @@ class WebDebugToolbarListener
      * Registers a core.response listener.
      *
      * @param EventDispatcher $dispatcher An EventDispatcher instance
+     * @param integer         $priority   The priority
      */
-    public function register(EventDispatcher $dispatcher)
+    public function register(EventDispatcher $dispatcher, $priority = 0)
     {
-        $dispatcher->connect('core.response', array($this, 'handle'));
+        $dispatcher->connect('core.response', array($this, 'handle'), $priority);
     }
 
     public function handle(Event $event, Response $response)

src/Symfony/Component/HttpKernel/ResponseListener.php

@@ -26,10 +26,11 @@ class ResponseListener
      * Registers a core.response listener to change the Content-Type header based on the Request format.
      *
      * @param EventDispatcher $dispatcher An EventDispatcher instance
+     * @param integer         $priority   The priority
      */
-    public function register(EventDispatcher $dispatcher)
+    public function register(EventDispatcher $dispatcher, $priority = 0)
     {
-        $dispatcher->connect('core.response', array($this, 'filter'));
+        $dispatcher->connect('core.response', array($this, 'filter'), $priority);
     }
 
     /**

src/Symfony/Framework/EventDispatcher.php

@@ -29,7 +29,9 @@ class EventDispatcher extends BaseEventDispatcher
     public function __construct(ContainerInterface $container)
     {
         foreach ($container->findTaggedServiceIds('kernel.listener') as $id => $attributes) {
-            $container->get($id)->register($this);
+            $priority = isset($attributes[0]['priority']) ? $attributes[0]['priority'] : 0;
+
+            $container->get($id)->register($this, $priority);
         }
     }
 }