[jira] [Created] (UIMA-4701) Creating CASs with common CAS Definition should share type systems

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

Marshall Schor created UIMA-4701:
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             Summary: Creating CASs with common CAS Definition should share type systems
                 Key: UIMA-4701
                 URL: https://issues.apache.org/jira/browse/UIMA-4701
             Project: UIMA
          Issue Type: Improvement
          Components: Core Java Framework
            Reporter: Marshall Schor
            Assignee: Marshall Schor
            Priority: Minor
             Fix For: 3.0.0SDKexp


Cas Definitions can be captured in the class CasDefinition and passed to the CasCreationUtils createCas methods.  This is done, for instance, when CAS Pools are created.  

The processing currently holds the definitions as description-objects, and re-parses these into type system implementations, every time a cas is produced.  These multiple type systems are identical, but replicated, which is wasteful.

Change the definition of CasDefinition to permit it to hold the derived TypeSystemImpl object, and change createCas to use that if available, to share common TypeSystemImplementations.

Other approaches that result in even more instances of type system sharing might be considered, but it's possible that different instances may be wanted in some cases in the future (for example, if we allow dynamic augmentation of types / features while running).



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