python twisted详解2

转载：作者:dave@http://krondo.com/slow-poetry-and-the-apocalypse/ 译者:杨晓伟(采用意译)
from twisted.internet import reactor
reactor.callWhenRunning(funcname)
reactor.run()

!/usr/bin/python

class Countdown(object):

counter = 5

def count(self):
    if self.counter == 0:
        reactor.stop()
    else:
        print(self.counter, '...')
        self.counter -= 1
        reactor.callLater(1, self.count)

from twisted.internet import reactor

reactor.callWhenRunning(Countdown().count)

print('Start!')
reactor.run()
print('Stop!')

reactor.callLater(1,self.count) 1秒后，调用方法
reactor.run()
reactor.callWhenRunning(xx.count)
--
工厂方法：

This is the Twisted Get Poetry Now! client, version 2.0.

NOTE: This should not be used as the basis for production code.

import datetime, optparse

from twisted.internet.protocol import Protocol, ClientFactory

def parse_args():
usage = """usage: %prog [options] [hostname]:port ...
This is the Get Poetry Now! client, Twisted version 2.0.
Run it like this:
python get-poetry.py port1 port2 port3 ...
If you are in the base directory of the twisted-intro package,
you could run it like this:
python twisted-client-2/get-poetry.py 10001 10002 10003
to grab poetry from servers on ports 10001, 10002, and 10003.
Of course, there need to be servers listening on those ports
for that to work.
"""

parser = optparse.OptionParser(usage)

_, addresses = parser.parse_args()

if not addresses:
    print parser.format_help()
    parser.exit()

def parse_address(addr):
    if ':' not in addr:
        host = '127.0.0.1'
        port = addr
    else:
        host, port = addr.split(':', 1)

    if not port.isdigit():
        parser.error('Ports must be integers.')

    return host, int(port)

return map(parse_address, addresses)

class PoetryProtocol(Protocol):

poem = ''
task_num = 0

def dataReceived(self, data):
    self.poem += data
    msg = 'Task %d: got %d bytes of poetry from %s'
    print  msg % (self.task_num, len(data), self.transport.getPeer())

def connectionLost(self, reason):
    self.poemReceived(self.poem)

def poemReceived(self, poem):
    self.factory.poem_finished(self.task_num, poem)

class PoetryClientFactory(ClientFactory):

task_num = 1

protocol = PoetryProtocol # tell base class what proto to build

def __init__(self, poetry_count):
    self.poetry_count = poetry_count
    self.poems = {} # task num -> poem

def buildProtocol(self, address):
    proto = ClientFactory.buildProtocol(self, address)
    proto.task_num = self.task_num
    self.task_num += 1
    return proto

def poem_finished(self, task_num=None, poem=None):
    if task_num is not None:
        self.poems[task_num] = poem

    self.poetry_count -= 1

    if self.poetry_count == 0:
        self.report()
        from twisted.internet import reactor
        reactor.stop()

def report(self):
    for i in self.poems:
        print 'Task %d: %d bytes of poetry' % (i, len(self.poems[i]))

def clientConnectionFailed(self, connector, reason):
    print 'Failed to connect to:', connector.getDestination()
    self.poem_finished()

def poetry_main():
addresses = parse_args()

start = datetime.datetime.now()

factory = PoetryClientFactory(len(addresses))

from twisted.internet import reactor

for address in addresses:
    host, port = address
    reactor.connectTCP(host, port, factory)

reactor.run()

elapsed = datetime.datetime.now() - start

print 'Got %d poems in %s' % (len(addresses), elapsed)

if name == 'main':
poetry_main()