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IBM's python threading example with Queues
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#!/usr/bin/python | |
# -*- coding: utf-8 -*- | |
import Queue | |
import threading | |
import urllib2 | |
import time | |
hosts = ['http://yahoo.com', 'http://google.com', 'http://amazon.com', | |
'http://ibm.com', 'http://apple.com'] | |
queue = Queue.Queue() | |
class ThreadUrl(threading.Thread): | |
"""Threaded Url Grab""" | |
def __init__(self, queue): | |
threading.Thread.__init__(self) | |
self.queue = queue | |
def run(self): | |
while True: | |
# grabs host from queue | |
host = self.queue.get() | |
# grabs urls of hosts and prints first 1024 bytes of page | |
url = urllib2.urlopen(host) | |
print url.read(1024) | |
# signals to queue job is done | |
self.queue.task_done() | |
start = time.time() | |
def main(): | |
# spawn a pool of threads, and pass them queue instance | |
for i in range(5): | |
t = ThreadUrl(queue) | |
t.setDaemon(True) | |
t.start() | |
# populate queue with data | |
for host in hosts: | |
queue.put(host) | |
# wait on the queue until everything has been processed | |
queue.join() | |
main() | |
print 'Elapsed Time: %s' % (time.time() - start) |
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