Chronos is a mutil-thread/mutil-process task scheduler drive by Tornado IOLoop.

Install the extension with the following command:

$ easy_install chronospy

or alternatively if you have pip installed:

$ pip install chronospy

or clone it form github then run the command in shell:

cd chronos # the path to the project
python setup.py install

import tornado
import chronos
import os
import urllib2


def test_process():
    print("process pid %s" % (os.getpid()))


def test(word):
    print("an other task, say '%s'" % (word))


def say():
    response = urllib2.urlopen('https://www.google.com/')
    html = response.read()
    print(html[:10])


def init():

    # bind a ioloop or use default ioloop
    chronos.setup()  # chronos.setup(tornado.ioloop.IOLoop())
    chronos.schedule('say', chronos.every_second(1), say)
    chronos.schedule('say2', chronos.every_second(1), test_process, once=True, process=True)
    chronos.schedule('say3', chronos.every_second(1), lambda: test("test3"))
    chronos.start(True)

if __name__ == '__main__':

    init()

setup(io_loop=None)

bind a io_loop or use default ioloop.

schedule(name, timer, func, once=False, start=False, process=False, max_executor=5)

add task into chronos:

name

uniqe task name,

timer

every timer object

func

the task function

once

set True will run only once time.

start

when chronos start and schedule a new task, if set to True will add to Tornado IOLoop and schedule to run at time.

process

if process is True, then the job will run in on a procees, otherwise defaultly running in thread.

max_executor

the max threads(or processes) to run a task.

remove_task(task_name)

stop and remove the task from chronos

start_task(task_name)

start the task in chronos

stop_task(task_name)

stop the task in chronos

start(start_ioloop=False)

add tasks in ioloop, if you use chronos in a tornado web server, you can set start_ioloop to "False", then start your custom ioloop later.

stop(stop_ioloop=False, clear=True)

stop the task in ioloop

stop_ioloop

will stop the ioloop if set to "True".

clear

will remove tasks from chrons if set to "True".

set eveny seconds to run a job:

every_second(5) # run job every 5 seconds

set every hourly or mintuely run a job:

every_at(hour=1, minute=10, second=0) # run at 01:10:00 every day
every_at(minute=10, second=0) # run at run at 10 mintue every hour

every(10).minutes
every().hour
every().day.at("10:30")
every().monday
every().wednesday.at("13:15")

Copyright (C) 2015 Thomas Huang

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.