This document summarizes a presentation about controlling technical debt with continuous delivery. It discusses using tools for continuous inspection of code to detect debt, automated code fixes to reduce debt incrementally, and integrating fixes into the continuous delivery pipeline to continuously pay down debt over time. Key aspects covered include metrics and tools to measure debt, automated fixes for common code issues, code transformation techniques to fix issues safely, and a WalkMod pipeline API to integrate fixes into the delivery process.

1. @raquelpau @alexsotob#Voxxed
Controlling Technical Debt with
Continuous Delivery
Raquel Pau - Alex Soto
WalkMod - RedHat

2. WA L K M O D F O U N D E R
B E S T P R A C T I C E S E N T H U S I A S T
@ R A Q U E L PA U
R A Q U E L PA U

3. R E D H AT E N G I N E E R
O P E N S O U R C E A D V O C AT E
@ A L E X S O T O B
A L E X S O T O

4. Q U E S T I O N S

5. S O F T WA R E I S
E AT I N G T H E W O R L D

8. FASTER
SOONER
BETTER

9. W H AT I S
C O N T I N U O U S D E L I V E RY ?

10. D E L I V E R B U S I N E S S VA L U E
M O R E F R E Q U E N T LY

12. O R C H E S T R AT I N G
T H E B U I L D

16. M I C R O S E R V I C E S
A N D
C O N T I N U O U S D E L I V E RY

18. N O M O R E
J O B S P L E A S E

19. P I P E L I N E
A S C O D E

20. F E AT U R E S O F P I P E L I N E E C O S Y S T E M
Configuration in Source Repository
Less click-and-type, more code
From simple to complex
Survives Jenkins restarts & connection losses
Reusable definitions
Build history/trend segregated per branches

21. pipeline {
agent any
stages {
stage('Test') {
steps {
sh './gradlew check'
}
}
}
post {
always {
junit 'build/reports/**/*.xml'
}
}
}

22. pipeline {
agent {
docker {
image 'maven:3-alpine'
args '-v "$PWD":/usr/src/mymaven -w /usr/src/mymaven’
}
}
stages {
stage('Example Build') {
steps {
sh 'mvn -B clean verify'
}
}
}
}

23. stage('Deploy - Staging') {
steps {
sh './deploy staging'
sh './run-smoke-tests'
}
}
post { (TODO test)
failure {
mail to: 'team@example.com',
subject: "Failed Pipeline: ${currentBuild.fullDisplayName}",
body: "Somethig is wrong with ${env.BUILD_URL}"
}
}
stage('Sanity check') {
steps {
input "Does the staging environment look ok?"
}
}

25. T W O - P I Z Z A T E A M S

27. Fabric 8: Features
Create
Build
Release
Runtime
Manage
Feedback
Platform
wizards to create microservices
packaging into multiple container images
rolling upgrades across teams environments
service discovery, scaling, failover, load balancing
centralise logs, metrics, alerts, tracing, circuit breaker
dashboards and metrics to get feedback
on premise, public or hybrid cloud

28. D I V E R S I F I E D T E A M S

29. A N D O N E D AY…
T E C H N I C A L D E B T S TA RT E D

30. T O R E D U C E D E B T
W E N E E D
M E T R I C S A N D T O O L S

32. feature#1234
feature#1354
C O N T I N U O U S I N S P E C T I O N

33. @SupressWarnings(“PMD”)
mvn pmd:check

35. M A N Y
C O D I N G S T Y L E R U L E S A R E
A U T O M AT I C A L LY F I X E A B L E

36. mvn walkmod:patch
gradle walkmodPatch

38. I T I S A L L A B O U T
C O D E T R A N S F O R M AT I O N S
public void visit(ImportDeclaration n, VisitorContext vc) {
if (n.getUsages().isEmpty()){
n.remove();
}
}

39. * K I L L E R F E AT U R E *
F O R M AT P R E S E R VAT I O N

40. T R U S T T O O L S
O R
E N S U R E T E S T C O V E R A G E

41. F I X - U P S R E C I P E
mvn walkmod:patch
git apply walkmod.patch
mvn test
git commit -a —fixup HEAD
git pull —rebase origin $branch
git push origin HEAD:$branch

42. feature#1354
git commit -a --fixup HEAD
C O N T I N U O U S F I X I N G S

43. P I P E L I N E L I B R A RY
#!groovy
@Library('github.com/walkmod/jenkins-pipeline-shared@maven')
…
stage('Fixing Release') {
steps {
walkmodApply(
validatePatch: false,
branch:'master',
alwaysApply: true,
alwaysFail: true )
}
}

44. WA L K M O D P I P E L I N E A P I
walkmodApply: fixes your build
hasWalkmodPatch: checks if there are fixings
applyWalkModPatch: applies the patch
pushWalkModPatch : pushes the patch

45. D E M O

46. I N C R E M E N TA L E X E C U T I O N
M I C R O - S E R V I C E S - S TA RT I T N O W
L E G A C Y C O D E - A P P LY T H E M I N C R E M E N TA L LY

48. WA L K M O D H U B

49. Q U E S T I O N S