Invariant Implementation for Domain Models Applying Incremental OCL Techniques

Constraints for rich domain models are easily specified with the Object Constraint Language (OCL) at model level, but hard to translate into executable code. We propose a solution which automatically translates the OCL invariants into aspect code able to check them incrementally after the execution of a Unit of Work getting good performance, a clean integration with programmers' code being respectful with the original design and easily combined with atomic all-or-nothing contexts (data base transactions, STM, ORM, etc.). The generated code solves some difficult issues: how to implement, when to check, over what objects and what to do in case of a violation