5m lines of code migration
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DESCRIPTION
Every company has legacy applications.And every framework, language, technology will dead or will become legacy.How to modernise them without the need to rewrite everything by hand?Does an automatic migration of source code is realistic on large applications?Does Eclipse technologies help for these tasks?This talk will answer these questions through a real use case executed for a french ministry: the migration of a large scale application (5 millions of line of code) from Forte to Java.We will explain our project process to insure 99,9999% of garanties to migrated code and how we create a custom migration factory with:EMF to represent source code as a structured modelCDO to store several Gigabits of datas with very good performancesAgility to reverse existing source codeGMF and ATL for Software Mining and cartographyAcceleo for translatingThe talk will also show demos of this migration tooling applied to other technologies and other needs of legacy analysis:ADA to C++VB to DotNetOracleForms to JavaEENatural Sonar (quality checker)Cobol cartographyTRANSCRIPT
- 1. 5M lines of code to migrate Howto with Eclipse Modeling tienne Juliot [email_address] Mikal Barbero [email_address]
2. Objective 3. 4. DEMO 5. Migration Step by Step 6. BIRD'S EYE VIEW Parse thecode Definetranslationdictionnary Implementthe translator Processiteratively 7. PARSE THE CODE 8. DEMO 9. ESTABLISH EQUIVALENCE RULES 10. ESTABLISH EQUIVALENCE RULES Specificy and document Define elements to translate first 11. DEMO 12. TEST DRIVEN IMPLEMENTATION Model of source code Transformation templates Source code BEFORE Source code AFTER Metamodel of source code 13. DEMO 14. ITERATIVE PROCESS Equivalencerules definition Migrated code evaluation OBEO PARTNER 15. # compilation errors inmigrated code helpsmesuring output quality Achieving 'good' qualityrequires lots ofback and forth THE LESSON? FOLLOW THE QUALITY 16. BUT WHEN? 17. Defining a target may be somewhat difficult 18. USE INDICATORS TECHNICAL DEBT SOFTWARE MINING 19. DEMO 20. Does it Scale? 21. Project for a Frenchadministration Success THE FACTS 10 years old critical application Made with declared EOL Fort UDS 5,000,000 LOC Iso functional migration Same performance (30,000 users) 4 errors / 10,000 migrated LOC (99.96%) THE GOALS 22. Available technologies COBOL (GCOS / MVS UNIX / CICS) DELPHI C/C++ ASP ABAP JHTML (ATG) JSP Java 5 FORT Flex Omnis OracleForms NSDK NATURAL LTR3 Power Builder Pro C PL1 PL/SQL Pascal VB 6 VB .NET Struts SQL Progress 23. [email_address]