pyzmq的Device笔记

    Queue device

    这是一个位于客户端可服务端的中间件，拓展了之前的REQ/REP模式，图

  通过这种方式，REQ socket和REP socket之间不需要明确绑定了，大家都绑定到Queue这个device就可以了，Queue device来处理请求的发送与返回，灵活度大大提升(不这样估计没人用)，看看代码                        Queue-device:

#coding=utf-8
import zmq

def main():

    try:
        context = zmq.Context(1)#IO线程数
        # 面向客户端
        frontend = context.socket(zmq.XREP)
        frontend.bind("tcp://*:5559")
        # 面向服务端
        backend = context.socket(zmq.XREQ)
        backend.bind("tcp://*:5560")

        zmq.device(zmq.QUEUE, frontend, backend)
    except Exception, e:
        print e
        print "bringing down zmq device"
    finally:
        pass
        frontend.close()
        backend.close()
        context.term()#手动结束context

if __name__ == "__main__":
    main()

  好心的告诉你，zmq.device()里有个while True:,所以别担心它自己结束,作者挺细心的:)

 Queue-server:这个就是普通的REP

import zmq
import time
import sys
import random

port = "5560"
context = zmq.Context()
socket = context.socket(zmq.REP)
socket.connect("tcp://localhost:%s" % port)
server_id = random.randrange(1,10005)
while True:
    #  Wait for next request from client
    message = socket.recv()
    print "Received request: ", message
    time.sleep (1)  
    socket.send("World from server %s" % server_id)

 Queue-client:普通的REQ

import zmq
import sys
import random

port = "5559"
context = zmq.Context()
print "Connecting to server..."
socket = context.socket(zmq.REQ)
socket.connect ("tcp://localhost:%s" % port)
client_id = random.randrange(1,10005)
#  Do 10 requests, waiting each time for a response
for request in range (1,10):
    print "Sending request ", request,"..."    
    socket.send ("Hello from %s" % client_id)
    #  Get the reply.
    message = socket.recv()
    print "Received reply ", request, "[", message, "]"

 run的顺序是Queue device先起来，然后server,client,一切如同之前的REQ/REP模式。

 对应的还有2个device,大同小异，复制下图

PUB/SUB家的:

PUSH/PULL家的:

  ok,接下来的似乎要深入点，总的来说感觉这个学习曲线还是很平滑的:)