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https://issues.apache.org/jira/browse/UIMA-4135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor resolved UIMA-4135.
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Resolution: Fixed
> support for modifying indexed FSs
> ---------------------------------
>
> Key: UIMA-4135
> URL: https://issues.apache.org/jira/browse/UIMA-4135
> Project: UIMA
> Issue Type: Improvement
> Components: Core Java Framework
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Fix For: 2.7.0SDK
>
>
> Both users and the UIMA framework (during deserialization of CASes in XCAS,
> XMI, or various Binary formats) may want to modify a feature in a FS which is
> used as a key in some index specification. If this FS is in the index, then
> indices which use this feature as a key may become corrupted, unless the FS
> is first removed from the indices. After that, the feature may be updated,
> and the FS re-added to the indices.
> If allow_multiple_add_to_indices is enabled, a particular FS may be added to
> indices multiple times; the above remove operation would need to remove all
> of these, and the above add operation would need to add-to-indices the same
> number as was removed.
> The count of the number of times a FS was in the indices needs to be kept by
> View.
> There are several optimizations possible for this operation. Bag indices do
> not need to be disturbed as they have no keys. Set indices only have at most
> one instance of a particular FS. FSs which are subtypes of AnnotationBase
> are only indexed in at most 1 view (the view of their sofa). The remove-all
> kind of operation for Sorted indices can be made efficient in that all the
> identical elements are stored adjacently, and the remove can be done in bulk.
> The update operations for one FS may involve multiple key values.
> Design a way to encapsulate the update operation that is efficient, for both
> users and the UIMA framework, supporting both a try-finally approach and an
> encapsulation via a Runnable.
> For example, for try - finally:
> {code:java}
> AutoCloseable ac = cas.protectIndices();
> try {
> ... user code ...
> } finally {
> ac.close();
> }
> {code}
> or, with a Runnable (written in Java 8 lambda style):
> {code:java}
> cas.withProtectIndices( () -> {
> ... user code ...
> });
> {code}
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