Software Re-engineering Forward & Reverse Engineering
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Software Re-engineering Forward & Reverse Engineering
- 2. Group Members Ali Raza Saleem Haf iz Abdul Rehman Mobeen-ur-Rehman Asad Mirza
- 3. Source code translation Reverse Engineering Software Re- engineering
- 4. Software re-engineering Reor ganising and modif ying exist ing sof t war e syst ems t o make t hem more maint ainable
- 5. Topics covered Source code t ranslat ion Reverse engineering
- 6. System re-engineering Re-st ruct ur ing or r e-writ ing par t or all of a legacy syst em wit hout changing it s f unct ionalit y Applicable wher e some but not all sub-syst ems of a lar ger syst em r equire f r equent maint enance Re-engineering involves adding ef f ort t o make t hem easier t o maint ain. The syst em
- 7. When to re-engineer When syst em changes are most ly rest r ict ed t o par t of t he syst em t hen r e-engineer t hat par t When har dware or sof t war e suppor t becomes out -dat ed
- 8. Re-engineering advantages Reduced risk There is a high r isk in new sof t ware development . Ther e may be development problems, st af f ing pr oblems and specif icat ion problems Reduced cost The cost of re-engineering is of t en
- 9. Business process re- engineering Concerned wit h r e-designing business pr ocesses t o make t hem mor e responsive and mor e ef f icient Of t en r eliant on t he int roduct ion of new comput er syst ems t o suppor t t he revised pr ocesses May f or ce sof t war e r e-engineering as
- 10. Forward engineering and re- engineering
- 12. Re-engineering cost factors The qualit y of t he sof t war e t o be r e- engineer ed The t ool support available f or r e- engineer ing The ext ent of t he dat a conver sion which is r equir ed
- 14. Source code translation I nvolves conver t ing t he code f r om one language (or language version) t o anot her e.g. FORTRAN t o C May be necessary because of : Hardware plat f orm updat e St af f skill short ages Organisat ional policy changes
- 16. Reverse engineering Analysing sof t war e wit h a view t o under st anding it s design and specif icat ion May be part of a re-engineer ing process but may also be used t o re-specif y a syst em f or re-implement at ion Pr ogr am under st anding t ools (browsers,
- 18. Reverse engineering Rever se engineer ing of t en pr ecedes re- engineer ing but is somet imes wort hwhile in it s own right The design and specif icat ion of a syst em may be reverse engineered so t hat t hey can be an input t o t he requirement s specif icat ion process f or t he syst em’s replacement
- 19. Key points The obj ect ive of re-engineering is t o improve t he syst em st ruct ure t o make it easier t o underst and and maint ain The re-engineering process involves source code t ranslat ion, reverse engineering, program st ruct ure improvement , program modularisat ion and dat a re- engineering Source code t ranslat ion is t he aut omat ic conversion of of program in one language t o anot her
- 20. Key points Reverse engineering is t he process of deriving t he syst em design and specif icat ion f rom it s source code Program st ruct ure improvement replaces unst ruct ured cont rol const ruct s wit h while loops and simple condit ionals Program modularisat ion involves reorganisat ion t o group relat ed it ems Dat a re-engineering may be necessary because of inconsist ent dat a management