Mike Barborak created UIMA-2431:
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Summary: allow CAS changes to be rolled back to specified marks
Key: UIMA-2431
URL: https://issues.apache.org/jira/browse/UIMA-2431
Project: UIMA
Issue Type: New Feature
Components: Core Java Framework
Reporter: Mike Barborak
As a CAS moves through a pipeline, there is a well defined sequence of changes
being applied to it. Currently, each change is applied to the CAS immediately
and so the sequence is lost. It would be nice to preserve the sequence as it
would make possible some useful features.
One such feature would be the ability to rollback the sequence of changes to
some specified point. Imagine then a pipeline where a mark is written to the
sequence before each component is run. Then, if the component threw an
exception or entered some other undesirable state, the CAS could be rolled back
to the last mark. It could then be serialized to disk for debugging or a flow
controller could reroute it in the pipeline.
Even when a component didn't enter such a state, being able to rollback a CAS
to a particular component's input state is useful for debugging performance (in
function or in resource usage) of that component.
Being able to track changes also means being able to model CAS deltas. This
functionality could become the base for communicating CAS changes efficiently
for example in the case that a UIMA-AS service needs to report changes it made
to a large input CAS.
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