Added logout Event and trigger

Chainable Adapter is registered to the events it offers
USer Controller calls logout on the adapters

src/ZfcUser/Authentication/Adapter/AdapterChain.php

@@ -79,6 +79,17 @@ public function resetAdapters()
         $this;
     }
 
+    /**
+     * logoutAdapters
+     *
+     * @return AdapterChain
+     */
+    public function logoutAdapters()
+    {
+        //Adapters might need to perform additional cleanup after logout
+        $this->getEventManager()->trigger('logout', $this->getEvent());
+    }
+
     /**
      * Get the auth event
      *

src/ZfcUser/Authentication/Adapter/AdapterChainServiceFactory.php

@@ -13,12 +13,19 @@ public function createService(ServiceLocatorInterface $serviceLocator)
 
         $options = $serviceLocator->get('zfcuser_module_options');
 
-        //iterate and attach multiple adapters
+        //iterate and attach multiple adapters and events if offered
         foreach($options->getAuthAdapters() as $priority => $adapterName) {
             $adapter = $serviceLocator->get($adapterName);
-            $chain->getEventManager()->attach('authenticate', array($adapter, 'authenticate'), $priority);
+
+            if(is_callable(array($adapter, 'authenticate'))) {
+                $chain->getEventManager()->attach('authenticate', array($adapter, 'authenticate'), $priority);
+            }
+
+            if(is_callable(array($adapter, 'logout'))) {
+                $chain->getEventManager()->attach('logout', array($adapter, 'logout'), $priority);
+            }
         }
 
         return $chain;
     }
-}
+}

src/ZfcUser/Controller/UserController.php

@@ -98,6 +98,7 @@ public function loginAction()
     public function logoutAction()
     {
         $this->zfcUserAuthentication()->getAuthAdapter()->resetAdapters();
+        $this->zfcUserAuthentication()->getAuthAdapter()->logoutAdapters();
         $this->zfcUserAuthentication()->getAuthService()->clearIdentity();
 
         $redirect = ($this->getRequest()->getPost()->get('redirect')) ? $this->getRequest()->getPost()->get('redirect') : false;