理解生产者消费者模型及在Python编程中的运用实例

class Consumer(threading.Thread):
  def __init__(self, queue):
    threading.Thread.__init__(self)
    self._queue = queue

  def run(self):
    while True:
      msg = self._queue.get()
      if isinstance(msg, str) and msg == 'quit':
        break
      print "I'm a thread, and I received %s!!" % msg
    print 'Bye byes!'


def producer():
  queue = Queue.Queue()
  worker = Consumer(queue)
  worker.start() # 开启消费者线程
  start_time = time.time()
  while time.time() - start_time < 5:
    queue.put('something at %s' % time.time())
    time.sleep(1)
  queue.put('quit')
  worker.join()


if __name__ == '__main__':
  producer()

import time
import threading
import Queue
import urllib2

class Consumer(threading.Thread):
  def __init__(self, queue):
    threading.Thread.__init__(self)
    self._queue = queue

  def run(self):
    while True:
      content = self._queue.get()
      print content
      if isinstance(content, str) and content == 'quit':
        break
      response = urllib2.urlopen(content)
    print 'Bye byes!'


def Producer():
  urls = [
    'http://211.103.242.133:8080/Disease/Details.aspx?id=2258',
    'http://211.103.242.133:8080/Disease/Details.aspx?id=2258',
    'http://211.103.242.133:8080/Disease/Details.aspx?id=2258',
    'http://211.103.242.133:8080/Disease/Details.aspx?id=2258'
  ]
  queue = Queue.Queue()
  worker_threads = build_worker_pool(queue, 4)
  start_time = time.time()
  for url in urls:
    queue.put(url)

  for worker in worker_threads:
    queue.put('quit')
  for worker in worker_threads:
    worker.join()

  print 'Done! Time taken: {}'.format(time.time() - start_time)


def build_worker_pool(queue, size):
  workers = []
  for _ in range(size):
    worker = Consumer(queue)
    worker.start()
    workers.append(worker)
  return workers

if __name__ == '__main__':
  Producer()