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Subject: Re: [wsbpel] Fault in Compensation



Hi Yuzo,

This question falls into Issue 226 domain.
The resolution of Issue 226 needs to be able to answer your question clearly.
(I will forward this email to issue 226 thread later.)

My current interpretation:
Q1: No there will not be the second invocation of CH1. Once the compensation handler of a completed scope got faulted, the whole scope also considered faulted (maybe we can come up with a more specialized term for that). (We need a life cycle diagram of "scope" here in the spec) The CH of such a scope should be uninstalled. (Because, if not uninstalled, the CH may be in a strange inconsistent state, where the CH logic may executed incorrectly, if it got executed twice.)
Q2: Yes, the T1 should be propagated to S2 and handled by F2.


Dieter and Satish, if my interpretation is different from yours and your collection of the preliminary direction discussed in Redmond F2F, please let me know.


Thanks!


Regards,
Alex Yiu



Yuzo Fujishima wrote:
Hi,

I have yet other questions regarding compensation.
Could someone help me answer to them?

Suppose we have a process as below:

process P1
 faultHandler F0 to catch T1
 flow
   scope S1
     faultHandler F1 to catch T2
       scope S2
         faultHandler F2 to catch T1
         compensate CA1
     sequence
       while
         scope S3
           compensationHandler CH1
             throw T1
       throw T2
   scope S4

Further suppose that
 S3 is successfully completed two times,
 T2 throws a fault,
 F1 catches the fault, and then
 CA1 is executed.

What is expected to happen next is that CH1 is called twice,
once for each successful completion.

But what will happen if T1 throws a fault in the first
invocation of CH1?

Q1: Will there be the second invocation of CH1?

Q2: Will the fault be propagated to CA1 then to S2?
   Or S3, S1 (FH uninstalled), then to P1?
   In other words, which will catch T1, F2 or F0?

Yuzo Fujishima
NEC Corporation

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