[jira] [Created] (UIMA-4146) Support Snapshot iterators for FSIndexes

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

Marshall Schor created UIMA-4146:
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             Summary: Support Snapshot iterators for FSIndexes
                 Key: UIMA-4146
                 URL: https://issues.apache.org/jira/browse/UIMA-4146
             Project: UIMA
          Issue Type: New Feature
          Components: Core Java Framework
            Reporter: Marshall Schor
            Assignee: Marshall Schor
             Fix For: 2.7.0SDK


Implementing "protectIndices" could have a consequence that some updated FSs could be removed from the indices by the framework, and addedback later.  If the user code were iterating they might get unexpected ConcurrentModificationExceptions because of this.

Extend the iterators to include "snapshot" iterators, that take a snapshot of the index contents at iterator creation time, and then use that to iterate over; this allows the iterator to avoid ConcurrentModificationExceptions.

Do this in a manner to continue to support the "extended for" style of iterating, where you can write
{code:java}
for (MyAnnotation : fsIndexProducingSnapshotIterators) { ... }
{code}



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