By H. S. M. Zedan, A Cau
ISBN-10: 189856356X
ISBN-13: 9781898563563
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Extra resources for Object-Oriented Technology and Computing Systems Re-Engineering
Sample text
The coexistence of legacy and new systems that exhibit only functional interactions re quires that the legacy code is reworked to make its components accessible from the outside. A recommended solution consists of encapsulating the legacy code in a wrapper which ex ports the desired resources. This approach is particularly promising when the new system is object-oriented, as encapsulation may be easily achieved by building an object wrapper which offers all the functions of the legacy system as if through the interface of an object.
3 additional components to customise/expand the functionality of a packaged system, may replace the base package without having to re-develop the custom components. We are using the IBM family of products ACG (Applicazioni Contabili Gestionali) as a target to experiment and assess the migration strategy and the coexistence framework. ACG is a modular accountancy package written in RPG on the IBM AS/400 machine using the native OS/400 relational database. It consists of a set of components that can be combined in different configurations to address a number of problems.
212. 1996. THE ESSENCE OF VDM++ + + Full details of V D M can be found in the language reference manual [3]. V D M adds the familiar concepts of classes and objects to standard VDM. The class becomes the module for structuring VDM specifications. Real-time elements, such as a variable now representing the current time, and specifications of time bounds for method executions and event responses, are also added to VDM-SL. A semantics for V D M in Real-Time Action Logic is given in [12]. Types, functions, values and instance variables use familiar VDM_SL notations.