Adds examoples/periodic-tasks

examples/periodic-tasks/myapp.py

@@ -0,0 +1,59 @@
+"""myapp.py
+
+Usage::
+
+   # The worker service reacts to messages by executing tasks.
+   (window1)$ python myapp.py worker -l info
+
+   # The beat service sends messages at scheduled intervals.
+   (window2)$ python myapp.py beat -l info
+
+   # XXX To diagnose problems use -l debug:
+   (window2)$ python myapp.py beat -l debug
+
+   # XXX XXX To diagnose calculated runtimes use C_REMDEBUG envvar:
+   (window2) $ C_REMDEBUG=1 python myapp.py beat -l debug
+
+
+You can also specify the app to use with the `celery` command,
+using the `-A` / `--app` option::
+
+    $ celery -A myapp worker -l info
+
+With the `-A myproj` argument the program will search for an app
+instance in the module ``myproj``.  You can also specify an explicit
+name using the fully qualified form::
+
+    $ celery -A myapp:app worker -l info
+
+"""
+from __future__ import absolute_import, unicode_literals, print_function
+
+from celery import Celery
+
+app = Celery(
+    # XXX The below 'myapp' is the name of this module, for generating
+    # task names when executed as __main__.
+    'myapp',
+    broker='amqp://guest@localhost//',
+    # ## add result backend here if needed.
+    # backend='rpc'
+)
+
+app.conf.timezone = 'UTC'
+
+@app.task
+def say(what):
+    print(what)
+
+
+@app.on_after_configure.connect
+def setup_periodic_tasks(sender, **kwargs):
+    # Calls say('hello') every 10 seconds.
+    sender.add_periodic_task(10.0, say.s('hello'), name='add every 10')
+
+    # See periodic tasks user guide for more examples:
+    # http://docs.celeryproject.org/en/latest/userguide/periodic-tasks.html
+
+if __name__ == '__main__':
+    app.start()