add method getListenerPriority() to interface

UPGRADE-3.0.md

@@ -107,6 +107,8 @@ UPGRADE FROM 2.x to 3.0
 
 ### EventDispatcher
 
+ * The method `getListenerPriority($eventName, $listener)` has been added to the
+   `EventDispatcherInterface`.
  * The interface `Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface`
    extends `Symfony\Component\EventDispatcher\EventDispatcherInterface`.
 

src/Symfony/Component/EventDispatcher/CHANGELOG.md

@@ -4,6 +4,8 @@ CHANGELOG
 3.0.0
 -----
 
+  * The method `getListenerPriority($eventName, $listener)` has been added to the
+    `EventDispatcherInterface`.
   * The methods `Event::setDispatcher()`, `Event::getDispatcher()`, `Event::setName()`
     and `Event::getName()` have been removed.
     The event dispatcher and the event name are passed to the listener call.

src/Symfony/Component/EventDispatcher/EventDispatcher.php

@@ -73,14 +73,7 @@ class EventDispatcher implements EventDispatcherInterface
     }
 
     /**
-     * Gets the listener priority for a specific event.
-     *
-     * Returns null if the event or the listener does not exist.
-     *
-     * @param string   $eventName The name of the event
-     * @param callable $listener  The listener to remove
-     *
-     * @return int|null The event listener priority
+     * {@inheritdoc}
      */
     public function getListenerPriority($eventName, $listener)
     {

src/Symfony/Component/EventDispatcher/EventDispatcherInterface.php

@@ -77,6 +77,18 @@ interface EventDispatcherInterface
      */
     public function getListeners($eventName = null);
 
+    /**
+     * Gets the listener priority for a specific event.
+     *
+     * Returns null if the event or the listener does not exist.
+     *
+     * @param string   $eventName The name of the event
+     * @param callable $listener  The listener
+     *
+     * @return int|null The event listener priority
+     */
+    public function getListenerPriority($eventName, $listener);
+
     /**
      * Checks whether an event has any registered listeners.
      *