Refactoring as Code is part of Migration Engineering field that is developing tools for mass scale refactoring

1. REFACTORING
AS CODE (RAC)
By
Raja Nagendra Kumar, Code Doctor
TejaSoft Innovations Pvt. Ltd.
Bangalore JUG Meetup @ Sabre, ITPL
7th Oct 2023
Towards Modern Java : MIGRATION

2. TEJASOFT – CODE DOCTORS
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 2
20 years Micro
Entrepreneurship
system
No 1 choice for SMEs
and MNC choice for
Time Bound R&D
40k+ Innovative,
unique micro + macro
tasks
110+ Products
#techdebt cleanup
8+ billion cumulative
savings, 2+ billion
LOC
Complexity →
Amplified
Simplification
Migration
Engineering
(Modernize Legacy,
Mass Scale
Refactoring)
Clean Code Uplifts,
Audits, Technical Due
Diligence
fCTO System to own
current risks instantly

3. tests AS CODE
Unit Tests
Integration Tests
E2E Tests
API Tests
Functional Tests
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 3

4. WHY RAC
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 4

5. MIGRATION
ENGINEERING
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 5
Update - patching
Upgrade – New Version, No Data Change
Refactoring – Create Space for New Feature
Migration – API/Schema/Data Changes
Linters – IDE Checks
SCA – Static Code Analysis
Rewrite – Discard Existing
Transpile – Switch Language

6. EXAMPLES
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 6
https://www.linkedin.com/pulse/migrating-from-java-8-11-17-
rachit-mehrotra/
https://docs.oracle.com/en/java/javase/17/migrate/migrating-
jdk-8-later-jdk-releases.html
https://www.arhohuttunen.com/junit-5-migration/
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-
3.0-Migration-Guide

7. SEMANTIC SEARCH
Semantic search denotes search
with meaning, as distinguished from
lexical search where the search
engine looks for literal matches of the
query words or variants of them,
without understanding the overall
meaning of the query. Semantic
search seeks to
improve search accuracy by
understanding the searcher's
intent and the contextual meaning of
terms as they appear in the
searchable dataspace
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 7

8. INTELLIJ SEARCH STRUCTURALLY Safe Code Transformation
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 8

9. TYPES OF
MIGRATIONS
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 9

10. RECIPE DEVELOPMENT OPTIONS
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 10
Moderne -
OpenRewrite
Google -
Errorprone
Refaster
Eclipse - JDT

11. CODE WALKTHROUGH
OPENREWRITE
Add License Header
Log4J 1.x to 2.x
remove all System.out
Convert System.out to logger
JDK 8 to 17
JUnit 4 to JUnit 5
Spring 2.x to 3.x
Custom Recipes
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 11

12. GROWING ECOSYSTEM OF
RECIPES
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 12

13. REFERENCES
1. https://app.moderne.io/marketplace
2. https://www.youtube.com/watch?v=q-Le1dx2-t8
3. https://www.youtube.com/watch?v=o3rMdXR2bIU
4. https://www.youtube.com/watch?v=Vv-54qhnndU
5. https://www.youtube.com/watch?v=G824962s4MI
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 13

14. Q&A
RAJA NAGENDRA KUMAR , CODE DOCTOR, TEJASOFT INNOVATIONS PVT. LTD. NAGENDRA.RAJA@TEJASOFT.COM, +91-9886723872 14