More twisted imports handled.

lib/python/Zope2/Startup/__init__.py

@@ -20,7 +20,12 @@ import sys
 import socket
 from re import compile
 from socket import gethostbyaddr
-import twisted.internet.reactor
+try:
+    import twisted.internet.reactor
+    _use_twisted = True
+except ImportError:
+    _use_twisted = True
+    
 
 import ZConfig
 from ZConfig.components.logger import loghandler
@@ -111,6 +116,8 @@ class ZopeStarter:
             from App.config import getConfiguration
             config = getConfiguration()
             if config.twisted_servers:
+                if not _use_twisted:
+                    raise ValueError, "You do not have twisted installed."
                 twisted.internet.reactor.run()
             else:
                 import ZServer

lib/python/Zope2/Startup/datatypes.py

@@ -339,3 +339,10 @@ def zopeClassFactory(jar, module, name,
 # Zope class factory."  This no longer works with the implementation of
 # mounted databases, so we just use the zopeClassFactory as the default
 
+try:
+    from zope.app.twisted.server import ServerFactory
+    class TwistedServerFactory(ServerFactory):
+        pass
+except ImportError:
+    class TwistedServerFactory:
+        pass

lib/python/Zope2/Startup/zopeschema.xml

@@ -11,7 +11,7 @@
   <import package="tempstorage"/>
   <import package="Zope2.Startup" file="warnfilter.xml"/>
 
-  <sectiontype name="server" datatype="zope.app.twisted.server.ServerFactory">
+  <sectiontype name="server" datatype="Zope2.Startup.datatypes.TwistedServerFactory">
     <key name="type" required="yes" />
     <key name="address" datatype="inet-address" />
     <key name="backlog" datatype="integer" default="50" />