Fallback to just using the action level for BC with older monolog releases

Author: Seldaek

DependencyInjection/Configuration.php

@@ -63,7 +63,7 @@ public function getConfigTreeBuilder()
                             ->scalarNode('facility')->defaultValue('user')->end() // syslog
                             ->scalarNode('max_files')->defaultValue(0)->end() // rotating
                             ->scalarNode('action_level')->defaultValue('WARNING')->end() // fingers_crossed
-                            ->scalarNode('activation_strategy')->end() // fingers_crossed
+                            ->scalarNode('activation_strategy')->defaultNull()->end() // fingers_crossed
                             ->booleanNode('stop_buffering')->defaultTrue()->end()// fingers_crossed
                             ->scalarNode('buffer_size')->defaultValue(0)->end() // fingers_crossed and buffer
                             ->scalarNode('handler')->end() // fingers_crossed and buffer

DependencyInjection/MonologExtension.php

@@ -151,18 +151,15 @@ private function buildHandler(ContainerBuilder $container, $name, array $handler
             $nestedHandlerId = $this->getHandlerId($handler['handler']);
             $this->nestedHandlers[] = $nestedHandlerId;
 
-            if (!isset($handler['activation_strategy'])) {
-                $container
-                    ->register($handlerId.'.activation_strategy', '%monolog.handler.fingers_crossed.error_level_activation_strategy.class%')
-                    ->addArgument($handler['activation_level'])
-                ;
-
-                $handler['activation_strategy'] = $handlerId.'.activation_strategy';
+            if (isset($handler['activation_strategy'])) {
+                $activation = new Reference($handler['activation_strategy']);
+            } else {
+                $activation = $handler['action_level'];
             }
 
             $definition->setArguments(array(
                 new Reference($nestedHandlerId),
-                new Reference($handler['activation_strategy']),
+                $activation,
                 $handler['buffer_size'],
                 $handler['bubble'],
                 $handler['stop_buffering'],