Software Reengineering

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Software Reengineering

• Concept and applications

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What?

• Re Engineering
• Reengineering transformation process
• Goals
• improve ones understanding of the system
• improve systems maintainability, evolvability,
  reusability

Legacy system
New system
Examination, Analysis, Alteration
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What?

• Reengineering
• 60 Reverse Engineering gather knowledge
• Design recovery system level abstraction
• Re-documentation follow standard, reformatting
• 40 Forward Engineering apply knowledge
• Restructuring redesign
• Retargeting new platform
• Rewriting vs. Reengineering

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Why?

• Technology evolution Business process evolution
  gt legacy systems
• Implausible to rewrite all
• 90 of IT resources maintenance of legacy
  systems
• Examples of reengineering problems
• Y2K market 300 to 900 billion
• US Navy automated legacy system modernization
  project 1 billion of annual savings

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How?
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With what?

• Structural Analysis for Java (IBM)
• web browsing of structural dependencies
• detects structural anti-patterns
• Juliet for Java (Infotectonica)
• navigate code through queries Who calls this
  method? Who writes to this field? etc.
• OptimalAdvisor for Java (Compuware)
• component level architecture recovery
• measure code quality, find problems

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References

• Arnold, R., Software Reengineering, IEEE Computer
  Society Press, 1993.
• Chikofsky, Cross and May, Reverse
  engineering'', in Advances in Computers, Volume
  35
• Software Reengineering presentation
  http//www-adele.imag.fr/jmfavre/ENSEIGNEMENT/TRA
  NSPARENTS/SoftwareReengineering/6/SoftwareReengine
  ering-6.pdf
• SEI Open Systems Glossary http//www.sei.cmu.edu/
  opensystems/glossary.html
• Reasoning System NIST Report http//statusreports
  -atp.nist.gov/reports/94-06-0026TEXT.html
• NETWARCOM Legacy System Modernization report
  http//www.mainframemigration.org/ShowPost.aspx?Po
  stID436fmcs