# encoding: UTF-8
# 系統(tǒng)模塊
from Queue import Queue, Empty
from threading import *
#################################################
class EventManager:
 #----------------------------------------------------------------------
 def __init__(self):
  """初始化事件管理器"""
  # 事件對象列表
  self.__eventQueue = Queue()
  # 事件管理器開關(guān)
  self.__active = False
  # 事件處理線程
  self.__thread = Thread(target = self.__Run)
 
  # 這里的__handlers是一個字典，用來保存對應(yīng)的事件的響應(yīng)函數(shù)
  # 其中每個鍵對應(yīng)的值是一個列表，列表中保存了對該事件監(jiān)聽的響應(yīng)函數(shù)，一對多
  self.__handlers = {}
 
 #----------------------------------------------------------------------
 def __Run(self):
  """引擎運行"""
  while self.__active == True:
   try:
    # 獲取事件的阻塞時間設(shè)為1秒
    event = self.__eventQueue.get(block = True, timeout = 1) 
    self.__EventProcess(event)
   except Empty:
    pass
 
 #----------------------------------------------------------------------
 def __EventProcess(self, event):
  """處理事件"""
  # 檢查是否存在對該事件進行監(jiān)聽的處理函數(shù)
  if event.type_ in self.__handlers:
   # 若存在，則按順序?qū)⑹录鬟f給處理函數(shù)執(zhí)行
   for handler in self.__handlers[event.type_]:
    handler(event)
 
 #----------------------------------------------------------------------
 def Start(self):
  """啟動"""
  # 將事件管理器設(shè)為啟動
  self.__active = True
  # 啟動事件處理線程
  self.__thread.start()
 
 #----------------------------------------------------------------------
 def Stop(self):
  """停止"""
  # 將事件管理器設(shè)為停止
  self.__active = False
  # 等待事件處理線程退出
  self.__thread.join()
 
 #----------------------------------------------------------------------
 def AddEventListener(self, type_, handler):
  """綁定事件和監(jiān)聽器處理函數(shù)"""
  # 嘗試獲取該事件類型對應(yīng)的處理函數(shù)列表，若無則創(chuàng)建
  try:
   handlerList = self.__handlers[type_]
  except KeyError:
   handlerList = []
 
  self.__handlers[type_] = handlerList
  # 若要注冊的處理器不在該事件的處理器列表中，則注冊該事件
  if handler not in handlerList:
   handlerList.append(handler)
 
 #----------------------------------------------------------------------
 def RemoveEventListener(self, type_, handler):
  """移除監(jiān)聽器的處理函數(shù)"""
  #讀者自己試著實現(xiàn)
 
 #----------------------------------------------------------------------
 def SendEvent(self, event):
  """發(fā)送事件，向事件隊列中存入事件"""
  self.__eventQueue.put(event)
 
########################################################################
"""事件對象"""
class Event:
 def __init__(self, type_=None):
  self.type_ = type_  # 事件類型
  self.dict = {}   # 字典用于保存具體的事件數(shù)據(jù)

#-------------------------------------------------------------------
# encoding: UTF-8
import sys
from datetime import datetime
from threading import *
from EventManager import *
 
#事件名稱 新文章
EVENT_ARTICAL = "Event_Artical"
 
#事件源 公眾號
class PublicAccounts:
 def __init__(self,eventManager):
  self.__eventManager = eventManager
 def WriteNewArtical(self):
  #事件對象，寫了新文章
  event = Event(type_=EVENT_ARTICAL)
  event.dict["artical"] = u'如何寫出更優(yōu)雅的代碼\n'
  #發(fā)送事件
  self.__eventManager.SendEvent(event)
  print u'公眾號發(fā)送新文章\n'
 
#監(jiān)聽器 訂閱者
class Listener:
 def __init__(self,username):
  self.__username = username
 
 #監(jiān)聽器的處理函數(shù) 讀文章
 def ReadArtical(self,event):
  print(u'%s 收到新文章' % self.__username)
  print(u'正在閱讀新文章內(nèi)容：%s' % event.dict["artical"])
 
"""測試函數(shù)"""
#--------------------------------------------------------------------
def test():
 listner1 = Listener("thinkroom") #訂閱者1
 listner2 = Listener("steve")#訂閱者2
 
 eventManager = EventManager()
 
 #綁定事件和監(jiān)聽器響應(yīng)函數(shù)(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()