隨筆記錄zmq中的poller 用法

乙個執行緒中如果有多個sokect,同時需要收發資料時,zmq提供polling sockets實現，不用在send()或者recv()時阻塞socket。

下面是乙個在recv（）端接受資訊的poller()輪詢接受**。

#!/usr/bin/python

# -*- coding: utf-8
import zmq
import random
import time
from  multiprocessing import process
def server_push(port="5556"):
context = zmq.context()
socket = context.socket(zmq.push)
socket.bind("tcp://*:%s" % port)
print "running server on port: ", port
# serves only 5 request and dies
for reqnum in range(10):
if reqnum < 6:
socket.send("continue")
else:
socket.send("exit")
break
time.sleep (1)
def server_pub(port="5558"):
context = zmq.context()
socket = context.socket(zmq.pub)
socket.bind("tcp://*:%s" % port)
publisher_id = random.randrange(0,9999)
print "running server on port: ", port
# serves only 5 request and dies
for reqnum in range(10):
# wait for next request from client
topic = random.randrange(8,10)
messagedata = "server#%s" % publisher_id
print "%s %s" % (topic, messagedata)
socket.send("%d %s" % (topic, messagedata))
time.sleep(1)
def client(port_push, port_sub):
context = zmq.context()
socket_pull = context.socket(zmq.pull)
socket_pull.connect ("tcp://localhost:%s" % port_push)
print "connected to server with port %s" % port_push
socket_sub = context.socket(zmq.sub)
socket_sub.connect ("tcp://localhost:%s" % port_sub)
socket_sub.setsockopt(zmq.subscribe, "9")
#zmq.subscribe建立乙個訊息過濾標誌，訂閱以9為字首的訊息
print "connected to publisher with port %s" % port_sub
# 初始化poller
poller = zmq.poller()
poller.register(socket_pull, zmq.pollin)
poller.register(socket_sub, zmq.pollin)
# work on requests from both server and publisher
#如果設定為pollin則重新整理recv,與之對應的是pollout重新整理send傳送事件，也可以同時設定兩個標誌
should_continue = true
while should_continue:
socks = dict(poller.poll())
if socket_pull in socks and socks[socket_pull] == zmq.pollin:
message = socket_pull.recv()
print "recieved control command: %s" % message
if message == "exit":
print "recieved exit command, client will stop recieving messages"
should_continue = false
if socket_sub in socks and socks[socket_sub] == zmq.pollin:
string = socket_sub.recv()
topic, messagedata = string.split()
#python split()通過指定分隔符對字串進行切片，如果引數num 有指定值，則僅分隔 num 個子字串
#str.split(str="", num=string.count(str)).
# str -- 分隔符，預設為所有的空字元，包括空格、換行(\n)、製表符(\t)等,num -- 分割次數
print "processing ... ", topic, messagedata
if __name__ == "__main__":
# now we can run a few servers
server_push_port = "5556"
server_pub_port = "5558"
process(target=server_push, args=(server_push_port,)).start()
process(target=server_pub, args=(server_pub_port,)).start()
process(target=client, args=(server_push_port,server_pub_port,)).start()

flag (int, default=pollin|pollout) – 0mqpoll flags. if flag|pollin, recv events will be flushed. if flag|pollout, sendevents will be flushed. both flags can be set at once, which is the default.

這是程式執行結果。

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