[Twisted-Python] Twisted newb I can't add a cred checker to a Factory class

[adamjamesdrew same]

class ProxyIncomingProtocol(Protocol):
.....

class ProxyOutgoingProtocol(Protocol):
.....

class ProxyFactory(Factory):

    protocol = ProxyIncomingProtocol

class SimplePerspective(pb.Avatar):

    def perspective_echo(self, text):
        print 'echoing',text
        return text

    def logout(self):
        print self, "logged out"


class SimpleRealm:
    implements(IRealm)

    def requestAvatar(self, avatarId, mind, *interfaces):
        if pb.IPerspective in interfaces:
            avatar = SimplePerspective()
            return pb.IPerspective, avatar, avatar.logout
        else:
            raise NotImplementedError("no interface")

portal = Portal(SimpleRealm())
checker = InMemoryUsernamePasswordDatabaseDontUse()
checker.addUser("guest", "password")
portal.registerChecker(checker)


proxy_factory = proxy.ProxyFactory()
# ??????? how can I add the portal to the factory?
internet.GenericServer(cometsession.Port, factory=proxy_factory,
resource=root_resource, childName="tcp",
interface=INTERFACE).setServiceParent(serviceCollection)
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