Python 聊天室 II(SimpleXMLRPCServer模块实现)

并非上一个用SocketServer的聊天室的延续。用远程调用完成的聊天室。python

正好有Java的RMI聊天室的做业,就先用Python写了一个简单的相似远程调用的东西,逻辑完成以后,在Java上写一遍也是水到渠成的事。app

Python没有RMI,但拥有一个SimpleXMLRPCServer模块。函数

原理和RMI相似,不过省去了定义接口和生成stub的过程,并且不只支持调用远程对象,更支持调用远程函数。oop

下面的代码都只调用了远程函数。这点和RMI必须经过远程对象调用方法不一样。this

提及啦,Python算是个OO语言,但不像Java那样彻底的OO,能够彻底不用OO的方式来编写程序。code

基本上下面的程序就是如此,并且相对简洁,一样的RMI下次贴上来,代码量就多了不少,并且注册,接口等一系列事情,很烦。server

固然这个SimpleXMLRPCServer模块有个问题:敢不敢快一点!!!!!基本上读端有大概1秒的延迟,这个略显坑爹了。。xml

from SimpleXMLRPCServer import SimpleXMLRPCServer

# list to store the total message
ms=[]
# remote function
# each write client invoke this function to say something, and the message will be store in the ms list
def say(s):
	ms.append(s)
# each read client invoke this function to get the latest message.
# args: message_no the total message number which this client has received.
def showMessage(message_no):
	if message_no>=0:
		mst=ms[message_no:] # always to get the latest message which client haven't received.
		return mst

# create the XMLRPCServer
svr=SimpleXMLRPCServer(("", 8080), allow_none=True)
# regisrer functions
svr.register_function(say) 
svr.register_function(showMessage)
# run server
svr.serve_forever()
from xmlrpclib import ServerProxy
svr=ServerProxy("http://localhost:8080") #connect to server
while True: #loop to get input
	s=raw_input("Zhu Di:")
	svr.say(s) #Remote invoking the server's function
from xmlrpclib import ServerProxy
# connect to server
svr=ServerProxy("http://localhost:8080")
# the message number which this client has recveied.
message_no=0

# remote invoking the function to show the latest message
while True:
	ms=svr.showMessage(message_no)
	if len(ms)>0:
		for i in range(len(ms)):
			print ms[i]
		message_no+=len(ms)
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