On Wed, Nov 07, 2012 at 08:10:27AM +0100, Mario Camou wrote:
>
> (...)
>
> The problem is that the front-end app needs to know the FEI of the
> wait_for_save so that it can do the PUT. After thinking a bit more I am
> thinking that wait_for_save can search for the human_action workitem
> (probably using the WFID and the username) and then add its FEI to the
> workitem and perhaps send the URI to the front-end via XMPP. It would then
> return without doing a reply_to_engine. When the front-end PUTs the
> workitem with proceeded:true, an on_reply would take care of saving the
> work.
Yes, the wait_for_save could search for the human_action workitem.
> The problem I see here is a possible race condition, could the
> wait_for_save participant be executed before the human_action workitem is
> actually created and persisted?
Yes, it is a very likely scenario.
Why not try to simplify the whole scenario with
---8<---
Ruote.process_definition :name => 'bm_form_multi', :revision => '0.1' do
cursor do
wait_for_edit
human_action
wait_for_save
rewind :if => 'xyz...'
end
end # process_definition
--->8---
? It sounds possible from your description. Aggressively trying to simplify
the thing.
Human action would be terminated upon entering wait_for_save...
> Any other ideas?
Like I said in my previous email, I think a unique participant for the step
would be valuable...
Well, more like a pair participant/receiver.
---8<---
class AbstraCC::XmppFormParticipant < Ruote::Participant
def on_workitem
XMPP.publish(encode_workitem(workitem))
# do not reply to ruote,
# answer will come back via the HttpReceiver
end
end
$ruote.register_participant 'xmpp_form', AbstraCC::XmppFormParticipant
# ...
class AbstraCC::HttpReceiver < Ruote::Receiver
def receive(http_request)
super(decode_workitem(http_request)
end
end
$http_receiver = AbstraCC::HttpReceiver.new($ruote)
# ...
require 'sinatra'
post '/workitems' do
$http_receiver.receive(request)
[ 200, {}, 'ok' ]
end
--->8---
A single participant, a single fei.
Sorry if I'm wasting your time with those suggestions.
Best regards,
--
John Mettraux - http://lambda.io/jmettraux
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