python实现事件驱动

# encoding: UTF-8# 系统模块from Queue import Queue, Emptyfrom 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-8import sysfrom datetime import datetimefrom 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()