Using first-class contexts to realize dynamic software updates
Proceedings of the International Workshop on Smalltalk Technologies
Incremental dynamic updates with first-class contexts
TOOLS'12 Proceedings of the 50th international conference on Objects, Models, Components, Patterns
Optimising schema evolution operation sequences in object databases for data evolution
ER'12 Proceedings of the 31st international conference on Conceptual Modeling
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With the wide support for serialization in objectoriented programming languages, persistent objects have become common place. Retrieving previously “persisted” objects from classes whose schema changed is however difficult, and may lead to invalidating the consistency of the application. The ESCHER framework addresses this issues through an IDE-based approach that handles schema evolution by managing versions of the code and generating transformation functions automatically. The infrastructure also enforces class invariants to prevent the introduction of any corrupt objects. This article describes the principles behind invariant-safe schema evolution,and the design and implementation of the ESCHER system.