Another take on message handler registration

RegistryActor.py

"""
RegistryActor - a dict-based dispatcher for actors

Usage:

from .actors import RegistryActor

class Hello(RegistryActor):
    def __init__(self):
        super(self.__class__, self).__init__()
        self.registry[SomeMessageClass] = self.do_something

    def do_something(self, message, sender):
        pass


Pros:
    * works with inheritance

Cons:
    * uses inheritance (? is this a con?)
"""

from thespian.actors import Actor

class RegistryActor(Actor):
    def __init__(self):
        self.registry = {}

    def receiveMessage(self, message, sender):
        klass = message.__class__
        if not klass in self.registry:
            for k in self.registry:
                if isinstance(message, k):
                    self.registry[klass] = self.registry[k]
                    break
        method = self.registry.get(klass, getattr(self, 'receiveUnrecognizedMessage', None))
        if method is not None:
            method(self, message, sender)