Legacy System Wrapping for Department of Defense Information System Modernization

This document explains the activities, benefits, problems, and issues in using the object-oriented technique of software wrapping to support the migration from legacy information systems to modernized systems. DoD legacy systems have obsolete technologies such as closed systems, stovepipe design, an...

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Bibliographic Details
Main Authors: Jordan, Kathleen A, Haugh, Brian A, Noor, Asghar I, Smith, D. D
Format: Report
Language:English
Subjects:
ADA PROGRAMMING LANGUAGE
CLIENT SERVER TECHNOLOGY
COMPUTER COMMUNICATIONS
Computer Programming and Software
DATA BASES
DATA MANAGEMENT
DEPARTMENT OF DEFENSE
GRAPHICAL USER INTERFACE
MANAGEMENT INFORMATION SYSTEMS
MILITARY MODERNIZATION
OBJECT ORIENTED PROGRAMMING
SOFT WRAPPING
SOFTWARE ENGINEERING
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Summary:This document explains the activities, benefits, problems, and issues in using the object-oriented technique of software wrapping to support the migration from legacy information systems to modernized systems. DoD legacy systems have obsolete technologies such as closed systems, stovepipe design, and outmoded programming languages or database systems. Software wrapping is used to create an interface around data, individual modules, subsystems, or whole systems, allowing access to the entities in the original system. Examples of wrapping implementation and guidelines, using the Ada programming language (Ada 83), are given for functions or subprograms originally written in the Cobol, C, Fortran, and Assembler. In addition, software wrapping is analyzed in the broader context of alternative migration strategies for a whole system. The unite-and-conquer strategy appears to be better suited to software wrapping, using a unified object model throughout progressive stages of migration, as compared to the other three strategies (divide-and-conquer, divide-and-wrap, one-short-rebuild).