Invariant Implementation for Domain Models Applying Incremental OCL Techniques

Abstract

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.

Runtime adaptability to domain model changes with efficient constraint checking

“…• By the improving and extending the treatment of constraints expressed in OCL [1], and • By automating the process of slicing the model, based on a classification of types of restrictions and subsequent dynamic adaptation thereof. [2].…”