python事件驱动模型的代码

概述python事件驱动模型的代码

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__author__ = 'administrator'#/usr/env/bin python '''  this is document'''class Event(object):    '''      事件初始化的一个方式    '''    def __init__(self,event_type,data=None):        self._type = event_type        self._data = data     @property    def type(self):        return self._type     @property    def data(self):        return self._data class Eventdispatcher(object):     """    event分发类 监听和分发event事件    """     def __init__(self):         #初始化事件         self._events = dict()      def __del__(self):         self._events = None      def has_Listener(self,Listener):        if event_type in self._events.keys():            return Listener in self._events[event_type]        else:            return False      def dispatch_event(self,event):          """        dispatch an instance of Event class        """        # 分发event到所有关联的Listener          if event.type in self._events.keys():              Listeners = self._events[event.type]               for Listener in Listeners:                  Listener(event)      def add_event_Listener(self,Listener):         #给某种事件类型添加Listner         if not self.has_Listener(event_type,Listener):             Listeners = self._events.get(event_type,[])             Listeners.append(Listener)             self._events[event_type] = Listeners      def remove_event_Listener(self,Listener):         if self.has_Listener(event_type,Listener):             Listeners = self._events[event_type]             if len(Listeners) == 1:                 del self._events[event_type]             else:                 Listeners.remove(Listener)                 self._events[event_type] = Listeners class MyEvent(Event):    ASK = "askMyEvent"    RESPOND = "respondMyEvent" class WhoAsk(object):    def __init__(self,event_dispatcher):        self.event_dispatcher = event_dispatcher        self.event_dispatcher.add_event_Listener(            MyEvent.RESPOND,self.on_answer_event        )    def ask(self):        print("who are Listener to me?")        self.event_dispatcher.dispatch_event(MyEvent(MyEvent.ASK,self))     def on_answer_event(self,event):        print("receive event %s",event.data) class WhoRespond(object):   def __init__(self,event_dispatcher):       self.event_dispatcher = event_dispatcher       self.event_dispatcher.add_event_Listener(MyEvent.ASK,self.on_ask_event)    def on_ask_event(self,event):       self.event_dispatcher.dispatch_event(MyEvent(MyEvent.RESPOND,self))  dispatcher = Eventdispatcher()who_ask = WhoAsk( dispatcher )who_responde1 = WhoRespond( dispatcher )who_responde2 = WhoRespond( dispatcher ) # WhoAsk askwho_ask.ask()

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