RE: [bpel4people] BP-92 Proposal

["Kieselbach, Oliver" <oliver.kieselbach@sap.com>]

Hi Dieter,
I see it as follows:
We have two concepts..1) Routing Patterns 2) Composite Tasks
We have two syntax versions which we can recommend to describe either one: 1) the complex people assignment to describe the complex "who" and 2) the composite/subtask syntax to describe the complex "what". 
There is certainly an overlap for what can be expressed with either syntax, but there is also a delta:
- complex people assignment can't handle task definition of different types
- composite/subtask syntax can't describe the dynamic determination of the number of to be instantiated sub tasks based on the evaluation of a logical people group and the number of resolved people (multiInstance) (assuming TC agrees to proposal 97 to remove the "multiInstance" from the <subtask> element)

However, both, the complex people assignment and the composite/subtask syntax result in the same runtime instantiation model, that means for example that a Task Engine automatically instantiate all the subtasks, described by a complex people assignment as soon as the wrapper task moves in status "in progress" (assuming TC agrees on proposal 94)

Regards
-Oliver

-----Original Message-----
From: Dieter Koenig1 [mailto:dieterkoenig@de.ibm.com] 
Sent: Mittwoch, 22. Juli 2009 14:49
To: Kieselbach, Oliver
Cc: bpel4people@lists.oasis-open.org
Subject: Re: [bpel4people] BP-92 Proposal


Hi Oliver, IMO, it would help to be more specific about when precisely
routing patterns can be used as a special syntax for composite tasks. For
example, something like:

<spec-text>
Routing patterns can be used as a convenient syntax to decribe the "who" in
a composite task, where all of the following is true:
 - all subtasks have the same interface
 - all subtasks have an activation pattern of "automatic"
 - (whatever else is needed)
</spec-text>

You might then drop the later sentence "A composite task, including
subtasks of different task types, can be desribed only using the composite
task syntax".

As a side remark, we need to clean up the usage of the term "task type" --
it is sometimes used in the sense of "task definition" (as opposed to "task
instance") and sometimes in the sense of "task vs. notification" -- I will
open a separate issue for this.

Kind Regards

Dieter König

Senior Technical Staff Member, WebSphere Process Server Architect
IBM Software Group, Application and Integration Middleware Software
WSS Business Process Solutions
                                                                                              
                                                                                              
                                                                                              
                                                                                              
                                                                                              
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  From:       "Kieselbach, Oliver" <oliver.kieselbach@sap.com>                                                                                        
                                                                                                                                                      
  To:         <bpel4people@lists.oasis-open.org>                                                                                                      
                                                                                                                                                      
  Date:       21.07.2009 18:57                                                                                                                        
                                                                                                                                                      
  Subject:    [bpel4people] BP-92 Proposal                                                                                                            
                                                                                                                                                      





Please check the comment (the last comment) in the Jira issue for the
resolution proposal:


http://www.osoa.org/jira/browse/BP-92


Thanks


-Oliver