Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
366 views
in Technique[技术] by (71.8m points)

python - Celery, run task once at a specified time

How can I run a celery task at a given time, but only once?

I read the documentation and couldn't find any example of this.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can use parameter eta when calling the task. Example:

from datetime import datetime, timedelta

@app.task()
def hello(self):
    return 'hello world'


tomorrow = datetime.utcnow() + timedelta(days=1)
hello.apply_async(eta=tomorrow)

Documentation: http://docs.celeryproject.org/en/latest/userguide/calling.html#eta-and-countdown

Alternatively, when you want to call hello multiple times and to be sure it is executed only one at the time, you can use locking - more about it in the documentation: http://docs.celeryproject.org/en/latest/tutorials/task-cookbook.html#ensuring-a-task-is-only-executed-one-at-a-time


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...