[jira] [Created] (UIMA-5106) uv3 constant "id" for FSs (Proposed new Feature for uv3)

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

Marshall Schor created UIMA-5106:
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             Summary: uv3 constant "id" for FSs (Proposed new Feature for uv3)
                 Key: UIMA-5106
                 URL: https://issues.apache.org/jira/browse/UIMA-5106
             Project: UIMA
          Issue Type: New Feature
          Components: Core Java Framework
            Reporter: Marshall Schor
            Priority: Minor
             Fix For: 3.0.0SDKexp


Add constant ID for FSs. This would be an incrementing, long value. It would be constant through serialization/ deserialization cycles. There would be a lazily created map from longs to FSs (via weak links) to allow direct access from the ID to the FS.  Lazy intent is to not have a cost for this (space/time) other than the cost for 1 long / FS, if it is not used.

We could make this feature optional, as well, to avoid the 8 bytes per FS overhead, but in V3, I think that's not a good tradeoff (space savings vs complexity).  

Issues: 
* Current design allows parallelism of services, with returned results "stacked" into receiving CAS; would need to change (some of) the IDs coming back.

CAS would need to have the high-water-mark value as part of serializations.

Backwards compatibility:
* loading V2 CASs: generate new IDs upon loading.
* serializing to V2: (for connecting to V2 services): drop the IDs.

This is a proposed new V3 feature; comments appreciated.





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