Download PDF by Robert C. Seacord, Daniel Plakosh, Grace A. Lewis: Modernizing Legacy Systems

By Robert C. Seacord, Daniel Plakosh, Grace A. Lewis

ISBN-10: 0321118847

ISBN-13: 9780321118844

Provides a risk-managed method of legacy process modernization that mixes a data of software program applied sciences and an realizing of engineering techniques inside of a enterprise context. A case examine illustrates the transformation of a big offer chain process written in Cobol to a latest process in line with the Java 2 company variation (J2EE) structure. The authors (Software Engineering Institute) use the unified modeling language to symbolize structure drawings and layout styles.

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Extra resources for Modernizing Legacy Systems

Example text

Chapter 9 describes middleware technologies and standards that may be used to develop a modernized enterprise information system (EIS) including Enterprise JavaBeans (EJB), message-oriented middleware (MOM), Java 2 Enterprise Edition (J2EE), and XML Messaging. We also identify products that implement these technologies, particularly in the Unisys ClearPath 2200 and Sun Solaris operating system environments, because these two environments primarily frame the case study. Evaluate Technology Once we understand available technologies and their capabilities, we can compare and contrast them.

Must be answered. Depending on the response to this answer, it may be necessary to repeat some RMM steps. For example, if the code migration plan does not result in functionality being deployed early enough in the schedule, you may need to revise the plan before the overall strategy is considered feasible. It is also possible that the target architecture was too ambitious and must be reconsidered or that the target technologies evaluated are too complex, expensive, or otherwise fail to satisfy the constraints of the modernization effort.

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.

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Modernizing Legacy Systems by Robert C. Seacord, Daniel Plakosh, Grace A. Lewis

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