Open Stack

Excerpts from Joshua Harlow's message of 2015-09-29 11:39:16 -0700:
> mhorban wrote:
> >  > Excerpts from Josh's message:
> >
> >  >> So a few 'event' like constructs/libraries that I know about:
> >  >>
> >  >>
> > http://docs.openstack.org/developer/taskflow/types.html#taskflow.types.notifier.Notifier
> >
> >  >>
> >  >>
> >  >> I'd be happy to extract that and move to somewhere else if needed, it
> >  >> provides basic event/pub/sub kind of activities for taskflow
> > (in-memory,
> >  >> not over rpc...)
> >
> > I've investigated several event libraries...And chose taskflow because
> > first of all it fits all our requirements and it is already used in
> > openstack.
> 
> Very cool, will check more of that review out,
> 
> Although if we are going to go forward with this it's probably a good 
> idea to split that notification class/code out of taskflow and into its 
> own tiny library, so that taskflow and oslo.service can use it (this is 
> how https://github.com/openstack/automaton and 
> https://github.com/openstack/futurist came into being). That avoids 
> having to bring in all of taskflow when you are using just *one* of its 
> types/classes (and aren't really using the rest of taskflow).

+1 to streamlining

> 
> >
> >
> >  > Excerpts from Doug's message
> >
> >  >> We probably want the ability to have multiple callbacks. There are
> >  >> already a lot of libraries available on PyPI for handling "events" like
> >  >> this, so maybe we can pick one of those that is well maintained and
> >  >> integrate it with oslo.service?
> >
> > I've created raw review in oslo.service
> > https://review.openstack.org/#/c/228892/ .
> > I've used taskflow library(as Josh proposed).
> > By default I added one handler that reloads global configuration.
> > What do you think about such implementation?
> >
> > Marian
> >
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