From: David Wilemski <david@davidwilemski.com>
Date: Sat, 2 Jul 2011 07:06:25 +0000 (-0400)
Subject: Added dynamic loading of request handlers
X-Git-Tag: v2.1.0~134^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc42fc14334de10b0c6adbc97441accebb2e458c;p=thirdparty%2Ftornado.git

Added dynamic loading of request handlers

This commit implements gh-124.

Users can specify "module.ClassName" rather than load a module that
contains a request handler and then refering to the request handler
class.
---

diff --git a/tornado/web.py b/tornado/web.py
index 2e5a4c2f7..ffcbfd1d0 100644
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -1173,6 +1173,17 @@ class Application(object):
                 assert len(spec) in (2, 3)
                 pattern = spec[0]
                 handler = spec[1]
+
+                if isinstance(handler, str):
+                    # Lazy load the Module and instantiate the class
+                    # Must be a fully qualified name (module.ClassName)
+                    parts = handler.split('.')
+                    handler = ".".join(parts[:-1]) # create module name 
+                    handler = __import__(handler) # import the module
+                    for part in parts[1:]:
+                        handler = getattr(handler, part)
+                    # The class has now been loaded and we can continue
+
                 if len(spec) == 3:
                     kwargs = spec[2]
                 else: