Modernizing Legacy Systems by Robert C. Seacord, Daniel Plakosh, Grace A. Lewis
By Robert C. Seacord, Daniel Plakosh, Grace A. Lewis
Offers a risk-managed method of legacy method modernization that mixes a data of software program applied sciences and an figuring out of engineering tactics inside of a enterprise context. A case learn illustrates the transformation of a giant offer chain process written in Cobol to a latest procedure in keeping with the Java 2 firm version (J2EE) structure. The authors (Software Engineering Institute) use the unified modeling language to symbolize structure drawings and layout styles.
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Additional resources for Modernizing Legacy Systems
3. An incremental approach implies incremental funding; the funding may end before the modernization is complete. 4. Interactions between legacy and target software technologies are not well understood; target architectures and component ensembles may be infeasible. 5. Users have a perception of system performance given by the current legacy system; use of adapters for communicating between legacy and modernized performance might impact performance and cause user dissatisfaction. 6. " Many of these risks are significant both in their probability and their potential impact on the modernization effort.
Understanding, recording, and presenting the business case for the modernization effort are essential. They are needed both to obtain funding for the effort and to defend that funding over the life of the project. Incremental Modernization In his book Making the Software Business Case, Donald Reifer presents four dimensions of improvement, each of which can justify a modernization initiative [Reifer 02]. These 43 44 dimensions are increased productivity, reduced time to market, cost reduction/cost avoidance, and improved quality.
An ensemble defines the collection of components that evolve into the architecture for the system. The book Building Systems from Commercial Components [Wallnau 01] describes the use of component ensembles, model problems, and other techniques for generating just-in-time competencies in components and component integration. For now, we will simply state that this evaluation is necessary to formulate the eventual architecture and design of the system. In Chapter 10, we evaluate the feasibility of transactions that span over legacy and modernized components, on two different platforms, by constructing a model problem.