[UIMA-4687] UV3 improve JCas feature id use for index corruption checking and journaling

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.0.0SDK-beta
• Component/s: Core Java Framework
• Assignee: Marshall Schor
• Reporter: Marshall Schor
• Created: 04/Nov/15 13:36
• Updated: 08/Jul/17 21:18
• Resolved: 08/Jul/17 21:17

Description

When setting (changing) values for features, sometimes index corruption checking needs to be done, and sometimes changes need to be journaled. Both of these need to identify the feature involved. This operation should be fast and memory-cache-friendly (e.g. not involve following a long chain of dereferencings).

Add static final fields that represent features used by a particular JCas class, which have names derived from the short-feature-name, and won't collide with other names, and set these using the same JCasRegistry mechanism to unique values within a class loader. This allows the same JCas cover classes to be used with different type systems.

Change the corruption testing logic to use BitSets and have a version which uses these indexes as well as one which uses the FeatureImpl featureCode. Keep one extra table mapping these codes to FeatureImpls, per type system.

Issue Links

• supercedes: UIMA-2147 Generate static fields for type names and feature names in JCas wrappers