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Subject: Issue - 216 - Compensation Handling and forEach


This issue has been added to the wsbpel issue list with a status of "received". The status will be changed to "open" if the TC accepts it as identifying a bug in the spec or decides it should be accepted specially. Otherwise it will be closed without further consideration (but will be marked as "Revisitable")

The issues list is posted as a Technical Committee document to the OASIS WSBPEL TC pages on a regular basis. The current edition, as a TC document, is the most recent version of the document entitled in the "Issues" folder of the WSBPEL TC document list - the next posting as a TC document will include this issue. The list editor's working copy, which will normally include an issue when it is announced, is available at this constant URL.

Issue - 216 - Compensation Handling and forEach

Status: received
Date added: 6 Jun 2005
Categories: Compensation
Date submitted: 06 June 2005
Submitter: Yaron Y. Goland
Description: The issue 147 : Serial and Parallel For-Each proposal did not address what happens if someone calls compensate on a scope contained in a forEach activity. The key issue is that forEach creates a situation where there are multiple instances of the same scope in the same lexical position with the same name.
Submitter’s proposal: We need to specify <while> like compensation semantics for serial forEach.

The solution to parallel forEach depends on issue 204 : clarify the relationship between eventHandler and compensationHandler . If issue 204 is decided by requiring that eventHandlers contain <scope> activities then the solution is to just specify that calling the scope name inside of the forEach results in all the instances being compensated in parallel (since links can't cross in or out of a forEach or between scopes in a forEach there is no link ordering to worry about).

If issue 204 is decided by introducing ghost scopes then we will probably have to treat each child scope as a separate 'while like' entity that gets compensated as a unit.
Changes: 6 Jun 2005 - new issue


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