RE: [sca-bpel] ISSUE 58: Need to add Capability to indicate that aPartnerLink should be ignored when introspecting the ComponentType of a BPELProcess

http://www.osoa.org/jira/browse/BPEL-58

 

From: Mike Edwards
[mailto:] 

Sent: Monday, September 07, 2009 8:41 AM

To: OASIS BPEL

Subject: [sca-bpel] [NEW ISSUE] Need to add Capability to indicate that
a PartnerLink should be ignored when introspecting the ComponentType of a BPEL
Process

 

Raiser:  
                   
 Mike Edwards 

Target:  
                   
 sca-bpel-1.1-spec-cd02.doc 

Description:

Currently, any
declaration of a partnerLink within a BPEL process results in a
<service/> or a <reference/> appearing in the componentType of the

BPEL process.

This is not
desirable in all circumstances: 

- it may be
that a BPEL process is written with an inner loop, where the inner loop is
implemented as a nested <scope/>.  In this inner loop, it may

be that a
partnerLink is declared within the nested scope and used purely as a
"local variable" within the loop, for example where it is a reference

and the
reference target/EPR is assigned to it from the contents of a variable held in
an outer scope. 

In these
circumstances, the partnerLink in the inner loop is shadowing a partnerLink in
the outer scope - logically it represents the same partnerLink 

reference as
the partnerLink in the outer scope. 

At present, SCA
cannot handle a situation such as this - the inner partnerLink is introspected
as a <reference/> and so is the outer partnerLink - this 

means 2
references appear when only one is called for. 

To change this,
it is necessary to provide a capability for the writer of a BPEL process to indicate
that a given partnerLink should NOT be used 

to introspect a
<service/> or a <reference/> in the componentType. 

Proposal:

Add a new SCA
BPEL extension attribute that can be used to annotate a <partnerLink/>
element. 

@skip 

boolean -
default value is false 

When
@skip="true", the <partnerLink/> element is ignored when
introspecting  the compoenntType of the BPEL Process. 

The changes are
shown in this marked up version of CD02, where the changes are in Section 3.3
and Appendix A. 

Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.

Co Chair OASIS SCA Assembly TC.

IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.

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