merge wsgi_handler performance preload

Author: rouilj

roundup/cgi/wsgi_handler.py

@@ -84,9 +84,7 @@ def __init__(self, home, debug=False, timing=False, lang=None):
                 tracker_home=home)
         else:
             self.translator = None
-        # trigger pre-loading of imports and templates
-        with self.get_tracker():
-            pass
+        self.preload()
 
     def __call__(self, environ, start_response):
         """Initialize with `apache.Request` object"""
@@ -131,6 +129,11 @@ def __call__(self, environ, start_response):
         # all body data has been written using wfile
         return []
 
+    def preload(self):
+        """ Trigger pre-loading of imports and templates """
+        with self.get_tracker():
+            pass
+
     @contextmanager
     def get_tracker(self):
         # get a new instance for each request