Re: [wsbpel] Issue - 81 - Proposal For Vote

[Yuzo Fujishima <fujishima@bc.jp.nec.com>]

Yaron,

Can you explain what is a non-initial start activity?

The proposal says:
   A "start activity" is an initial activity that has a
   createInstance="yes" attribute defined on it.

Hence, a start activity must be always initial.

Do you mean

non-initial start activity
= an initial activity that has not been run first
   (because one of other initial activies has run first)?

Yuzo Fujishima
NEC Corporation

Yaron Y. Goland wrote:
> Given the resolution of issue 168 I propose the following as a 
> resolution for issue 81:
> 
> Summary: Make it legal to have initial activities that are not start 
> activities. After the initial start activity completes execution then 
> (as per issue 168) all initial activities begin executing, this includes 
> both non-initial start activities and non-start initial activities.
> 
> Section 6.5
> 
> Change: To be instantiated, each business process must contain at least
> one such "start activity." This must be an initial activity in the sense
> that there is no basic activity that logically precedes it in the
> behavior of the process.
> 
> To: To be instantiated, each business process must contain at least one
> such "start activity." That is, a receive/pick activity annotated with a
> createInstance="yes" attribute. See section 11.4 for more details on
> start activities.
> 
> Change: If exactly one start activity is expected to instantiate the
> process, the use of correlation sets is unconstrained.
> 
> To: If a process contains exactly one start activity then the use of
> correlation sets is unconstrained.
> 
> Section 11.4
> 
> Change: A receive activity annotated in this way MUST be an initial
> activity in the process, that is, the only other basic activities may
> potentially be performed prior to or simultaneously with such a receive
> activity MUST be similarly annotated receive activities.
> 
> To: A receive/pick activity annotated in this way MUST be a "start
> activity". A "start activity" is an initial activity that has a
> createInstance="yes" attribute defined on it. An initial activity is a
> receive/pick activity where no other activities but scope, flow,
> sequence and empty activities occur before it in the process's execution
> path. While all start activities must be initial activities not all
> initial activities are required to be start activities. If an initial
> activity is not a start activity then the initial activity will only
> become active after the chosen start activity, called the initial start 
> activity, has completed execution.
> 
> Change: It is permissible to have the createInstance attribute set
> to"yes" for a set of concurrent initial activities.
> 
> To: It is permissible to have multiple start activities. As specified in 
> section 6.5 the initial start activity must complete execution before 
> any other start activities, now treated as initial activities, are 
> allowed to execute.
> 
> Change: All such receive activities MUST use the same correlation sets
> (see Correlation).
> 
> To: If a process has multiple start activities then all the start
> activities MUST use the same correlation sets and the pattern for all
> the correlation sets MUST be sent to "rendezvous" (see Correlation).
> 
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