python实现事件驱动

 # encoding: UTF-8 # 系统模块 from Queue import Queue, Empty from threading import * ################################################# class EventManager: #---------------------------------------------------------------------- def __init__(self): """初始化事件管理器""" # 事件对象列表 self.__eventQueue = Queue() # 事件管理器开关 self.__active = False # 事件处理线程 self.__thread = Thread(target = self.__Run) # 这里的__handlers是一个字典，用来保存对应的事件的响应函数 # 其中每个键对应的值是一个列表，列表中保存了对该事件监听的响应函数，一对多 self.__handlers = {} #---------------------------------------------------------------------- def __Run(self): """引擎运行""" while self.__active == True: try: # 获取事件的阻塞时间设为1秒 event = self.__eventQueue.get(block = True, timeout = 1) self.__EventProcess(event) except Empty: pass #---------------------------------------------------------------------- def __EventProcess(self, event): """处理事件""" # 检查是否存在对该事件进行监听的处理函数 if event.type_ in self.__handlers: # 若存在，则按顺序将事件传递给处理函数执行 for handler in self.__handlers[event.type_]: handler(event) #---------------------------------------------------------------------- def Start(self): """启动""" # 将事件管理器设为启动 self.__active = True # 启动事件处理线程 self.__thread.start() #---------------------------------------------------------------------- def Stop(self): """停止""" # 将事件管理器设为停止 self.__active = False # 等待事件处理线程退出 self.__thread.join() #---------------------------------------------------------------------- def AddEventListener(self, type_, handler): """绑定事件和监听器处理函数""" # 尝试获取该事件类型对应的处理函数列表，若无则创建 try: handlerList = self.__handlers[type_] except KeyError: handlerList = [] self.__handlers[type_] = handlerList # 若要注册的处理器不在该事件的处理器列表中，则注册该事件 if handler not in handlerList: handlerList.append(handler) #---------------------------------------------------------------------- def RemoveEventListener(self, type_, handler): """移除监听器的处理函数""" #读者自己试着实现 #---------------------------------------------------------------------- def SendEvent(self, event): """发送事件，向事件队列中存入事件""" self.__eventQueue.put(event) ######################################################################## """事件对象""" class Event: def __init__(self, type_=None): self.type_ = type_  # 事件类型 self.dict = {}   # 字典用于保存具体的事件数据

 #------------------------------------------------------------------- # encoding: UTF-8 import sys from datetime import datetime from threading import * from EventManager import * #事件名称 新文章 EVENT_ARTICAL = "Event_Artical" #事件源 公众号 class PublicAccounts: def __init__(self,eventManager): self.__eventManager = eventManager def WriteNewArtical(self): #事件对象，写了新文章 event = Event(type_=EVENT_ARTICAL) event.dict["artical"] = u'如何写出更优雅的代码\n' #发送事件 self.__eventManager.SendEvent(event) print u'公众号发送新文章\n' #监听器 订阅者 class Listener: def __init__(self,username): self.__username = username #监听器的处理函数 读文章 def ReadArtical(self,event): print(u'%s 收到新文章' % self.__username) print(u'正在阅读新文章内容：%s' % event.dict["artical"]) """测试函数""" #-------------------------------------------------------------------- def test(): listner1 = Listener("thinkroom") #订阅者1 listner2 = Listener("steve")#订阅者2 eventManager = EventManager() #绑定事件和监听器响应函数(新文章) eventManager.AddEventListener(EVENT_ARTICAL, listner1.ReadArtical) eventManager.AddEventListener(EVENT_ARTICAL, listner2.ReadArtical) eventManager.Start() publicAcc = PublicAccounts(eventManager) timer = Timer(2, publicAcc.WriteNewArtical) timer.start() if __name__ == '__main__': test()