cool i take a loot. Extending this a bit it adds a lot of potential to make FSM "observable" via configuration. Each transition or action could have a list of observers - it also pops into my mind Prospective Search -
On 10 June 2011 10:22, Shawn R <shawn.ru...@gmail.com> wrote: > Hi David, > > No plans yet. I often accomplish these sorts of things using a > baseclass/subclass of FSMAction. Hopefully the following (UNTESTED) > code helps you along. > > === > > OBSERVERS = 'observers' > > class ObserverFSMAction(FSMAction): > # this is an abstract base class > def execute(self, context, obj): > self._execute(self, context, obj) > for observer in context.get(OBSERVERS, []): > observer.notify() > def _execute(self, context, obj): > raise NotImplementedError() > > class MyFSMAction(ObserverFSMAction): > # use this class in your fsm.yaml > def _execute(self, context, obj): > # actually do stuff and return event > # eg. add an observer > # NOTE: this is truly untested, but it should work > context[OBSERVERS] = context.get(OBSERVERS, []) + > [ObserverImpl(...)] > > class Observer(object): > def __init__(self, a_string_to_construct_an_instance_of_observer): > self._observerImpl = # make impl from supplied string > def notify(): > self._observerImpl.notify() > > class ObserverImpl(Observer): > def __init__(self, *args, **kwargs): > # make a useful observer > def __str__(self): # or maybe __unicode__ is required, can't > recall what webapp does with url params > # return a string that can be used to reconstruct self - maybe > just call __repr__? > def notify(): > # do stuff > > and in fsm.yaml > > context_types: > observers: module.name.of.Observer > > This would only act at the FSMAction level, not the state transition > level. Subclasses of FSMContext/FSMState which override .dispatch() > can also be very powerful - but these required bigger changes to the > framework. The previous example can be accomplished out-of-box > > On Jun 9, 2:05 pm, David Mora <dla.m...@gmail.com> wrote: > > BTW - any intentions on plugging an observer pattern/plugin around it :) > ? > > It would be awesome to have a list of observers watching for change on > > states (subject) > > > > On 9 June 2011 12:22, David Mora <dla.m...@gmail.com> wrote: > > > > > > > > > > > > > > > > > > > > > i'm also using it right now for some moderation flows i need to finish > so i > > > will test it too > > > > > On 9 June 2011 10:14, Jason Collins <jason.a.coll...@gmail.com> wrote: > > > > >> @Mike_W, I've updated the docs to describe this new feature. > > > > >> http://code.google.com/p/fantasm/wiki/AdvancedConcepts#Fan-In > > > > >> j > > > > >> On Jun 8, 9:44 pm, Robert Kluin <robert.kl...@gmail.com> wrote: > > >> > Hey Shawn, > > >> > Awesome, I'll try to review it tomorrow! > > > > >> > Hopefully Mike is still following this thread and will help us > test > > >> > it out. :) > > > > >> > Robert > > > > >> > On Wed, Jun 8, 2011 at 12:03, Shawn <shawn.ru...@gmail.com> wrote: > > >> > > Hi Robert, > > >> > > Done.http://code.google.com/p/fantasm/source/detail?r=147. > > >> > > Please give it a quick review if you are able. > > >> > > Thanks again. > > >> > > -- > > >> > > Shawn > > > > >> > > -- > > >> > > You received this message because you are subscribed to the Google > > >> Groups > > >> > > "Google App Engine" group. > > >> > > To view this discussion on the web visit > > >> > > > https://groups.google.com/d/msg/google-appengine/-/Y2FNTEJHRWdqczhK. > > >> > > To post to this group, send email to > > >> google-appengine@googlegroups.com. > > >> > > To unsubscribe from this group, send email to > > >> > > google-appengine+unsubscr...@googlegroups.com. > > >> > > For more options, visit this group at > > >> > >http://groups.google.com/group/google-appengine?hl=en. > > > > >> -- > > >> You received this message because you are subscribed to the Google > Groups > > >> "Google App Engine" group. > > >> To post to this group, send email to > google-appengine@googlegroups.com. > > >> To unsubscribe from this group, send email to > > >> google-appengine+unsubscr...@googlegroups.com. > > >> For more options, visit this group at > > >>http://groups.google.com/group/google-appengine?hl=en. > > > > > -- > > >http://about.me/david.mora > > > > --http://about.me/david.mora > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appengine@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- http://about.me/david.mora -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
