python一种分派消息的方法

nahuat

[color="#8080ff"]#!/usr/bin/python
[color="#8080ff"]# -*- coding: utf8 -*-
[color="#ffff00"]class [color="#00ffff"]dispatch:
    [color="#ffff00"]def [color="#00ffff"]__init__(self):
        self.__map = dict()
    [color="#ffff00"]def [color="#00ffff"]attach(self, instance):
        id, map = instance.callback_traits
        self.__map[id] = map
    [color="#ffff00"]def [color="#00ffff"]detach(self, instance):
        [color="#ffff00"]del self.__map[instance.callback_traits[0]]
    [color="#ffff00"]def [color="#00ffff"]execute(self, instance, method, request):
        [color="#ffff00"]if self.__map.has_key(instance):
            method_map = self.__map[instance]
            [color="#ffff00"]if method_map.has_key(method):
                method_map[method].__call__(request)
[color="#ffff00"]class [color="#00ffff"]role:
    [color="#ffff00"]def [color="#00ffff"]__init__(self):
        self.callback_traits = (1, {1:self.login, 2:self.move})
    [color="#ffff00"]def [color="#00ffff"]login(self, request):
        [color="#ffff00"]print '[color="#ff6060"]role::login', request
    [color="#ffff00"]def [color="#00ffff"]move(self, request):
        [color="#ffff00"]print '[color="#ff6060"]role::move', request
[color="#ffff00"]class [color="#00ffff"]package:
    [color="#ffff00"]def [color="#00ffff"]__init__(self, name):
        self.callback_traits = (2, {1:self.add, 2:self.remove})
        self.name = name
    [color="#ffff00"]def [color="#00ffff"]add(self, request):
        [color="#ffff00"]print '[color="#ff6060"]package::add(%s)' % self.name, request
    [color="#ffff00"]def [color="#00ffff"]remove(self, request):
        [color="#ffff00"]print '[color="#ff6060"]package::remove(%s)' % self.name, request
[color="#ffff00"]if __name__ == '[color="#ff6060"]__main__':
    d = dispatch()
    p1, p2 = package('[color="#ff6060"]one'), package('[color="#ff6060"]two')
    p = p2
    d.attach(role())
    d.attach(p)
    d.execute(1, 1, '[color="#ff6060"]hello')
    d.execute(1, 2, '[color="#ff6060"]world')
    d.execute(2, 1, '[color="#ff6060"]foo bar')
    d.execute(2, 2, '[color="#ff6060"]hello, world!')
    d.detach(p)
    d.execute(2, 1, '[color="#ff6060"](del)foo bar')
    d.execute(2, 2, '[color="#ff6060"](del)hello, world!')


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/21842/showart_1970558.html