On Sun, May 16, 2010 at 08:55:17PM -0700, eric woo wrote:
>
> i want to map a particitant to group of user,so when i launch a
> process definition,i must read the process definition to know all
> particitant,and then map the particitant to user.
Hello Eric,
are you sure you need to read the process definition to know all participants
before the participant execution ?
You could :
a) use "user names" as "participants"
sequence do
eric
hanse
end
but this is very inflexible.
b) use "group names"
sequence do
team_a
team_b
end
And then, in your application, have some way to map users to groups.
class User
def groups
[ 'team_a', 'team_x' ]
end
def workitems
groups.inject([]) do |a, groupname|
a += RuoteKit.storage_participant.by_participant(groupname)
a
end
end
end
"reading the process definition before launching it to determine the list of
participants" is a very inflexible technique. Consider this piece of process
definition :
sequence do
participant :ref => '${f:next_team}'
participant :ref => '${f:next_team}'
end
The participants are obviously determined at runtime, the first participant may
change the value of the field 'next_team'...
> my problem is if i can get all particitant when i start launch a
> process definition.
As I wrote, if you are focusing on launchtime, you will lose the flexibility of
choosing "just in time" (runtime).
> or if i can implement Ruote::StorageParticipant?
Nothing prevents you from subclassing / re-opening this class.
> just like before reply the workitem to engine,if i can map the
> particitant to the user,then insert to table about the next step user.
Consider this loop :
pdef = Ruote.process_definition :name => 'for_eric' do
cursor do
participant '${f:next}'
rewind :if => '${f:next}'
end
end
# ...
engine.launch(pdef, 'next' => 'eric')
The first participant is the user 'eric'. Once eric has replied, the 'cursor'
is rewound if the field 'next' is still filled with a value. For example, eric
could have set the value to 'hanse'. Once a user erases the value in 'next',
the cursor will exit (it will not rewind).
Participants are decided at runtime, just in time.
http://ruote.rubyforge.org/exp/cursor.html
Of course, nothing prevents you from using group names instead of user names.
I hope this will help, best regards,
--
John Mettraux - http://jmettraux.wordpress.com
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