Agenda: What is Gradle? How it works Build all kinds of projects Enjoy the benefits of Gradle

1. Gradle:
One technology to build them all
Baptiste Mesta - R&D Engineer @ Bonitasoft
@baptistemesta
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2. Baptiste Mesta
R&D Engineer @ Bonitasoft since 2009
● BPM Execution engine
● Developer tooling
● IA/Analytics module
Twitter: @baptistemesta
Github: baptistemesta
About me
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3. • What is Gradle?
• How it works
• Build all kinds of projects
• Enjoy the benefits of Gradle
Agenda
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4. What is Gradle?
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5. • Build tool written in Java
• Execute on the JVM
• Open source
• Supported by a company: Gradle Inc.
What is Gradle?
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6. Comprehensive DSL to configure build
What is Gradle?
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7. Easy to read build execution
What is Gradle?
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Gradle Maven

8. Highly customizable and extensible
What is Gradle?
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9. How it works
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10. • Reads Gradle build scripts
• Creates a dependency graph of tasks
• Executes required tasks
How it works
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11. Tasks: units of work
How it works
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Tasks can have dependencies

12. How it works
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13. How it works
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compileJava
Inputs Outputs
src/main/java/**/*.java build/classes/java/main/**
/*.class

14. Simple Java project
How it works
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15. How it works
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16. Build all kinds of projects
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17. “Java is nice… but I also have some "Go" in my project…”
Build all kinds of projects
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... plugins to the rescue!

18. Use a community plugin to build a Go project
Build all kinds of projects
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19. Use a community plugin to build a Go project
Build all kinds of projects
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20. “What if there is no community plugin that fits my needs?”
Build all kinds of projects
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… extract your build logic to a custom plugin

21. Build all kinds of projects
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buildUIDPage
Inputs Outputs
.json + .js .html + .css + .js
Call build Get page

22. Build all kinds of projects
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Go module: community plugin
UID page: custom plugin
App distrib: depends on other
modules and packages them
Java module: provided plugins

23. “Ok I can build all kind of technologies with Gradle…
but why should I?”
Build all kind of projects
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24. Enjoy the benefits of Gradle
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25. “Do I still need to install Node, npm and Go locally?”
Plugins download distributions if required
Enjoy the benefits of Gradle
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26. “Do I still need to install Gradle?”
Use the Gradle wrapper
You only need a JVM on your environment and on your CI
Enjoy the benefits of Gradle
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27. Work avoidance
Enjoy the benefits of Gradle
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TaskInputs Outputs
Source files Files produced
Compare hash of
source files from
previous build Same hash: Skip the task
Hash changed: Execute
the task

28. Work avoidance
First build
Enjoy the benefits of Gradle
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Java dev
Go
Java
UID
Distribution
1. Build
3. Compile
5. Zip all
2. Compile
4. Compile
My project

29. Work avoidance
Second build
Enjoy the benefits of Gradle
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Java dev
Go
Java
UID
Distribution
1. Build
again 3. Compile
5. Zip all
2. Compile
4. Compile
My project
UP-TO-DATE
UP-TO-DATE
UP-TO-DATE
UP-TO-DATE

30. Work avoidance
Third build with code change
Enjoy the benefits of Gradle
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Java dev
Go
Java
UID
Distribution
1. Modify
Java
code and
build
3. Compile
5. Zip all
2. Compile
4. Compile
My project
UP-TO-DATE
UP-TO-DATE

31. Work avoidance for your team / CI
Enjoy the benefits of Gradle
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32. Back to our multi-techno build. What happens in real life?
Enjoy the benefits of Gradle
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Java dev
Go
Java
UID
Distribution
1. Update
+ build 3. Compile
5. Zip all
2. Compile
4. Compile
My project

33. Back to our multi-techno build. What happens in real life?
Enjoy the benefits of Gradle
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Java dev
Remote
cache
Go
Java
UID
Distribution
1. Update
+ build
2. Retrieve
from cache
5. Zip all
2. Compile
3. Compile
4. Compile
My project

34. Enjoy the benefits of Gradle
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Our Java developer never had to build Go or UID modules

35. Build time gained @ Bonitasoft on a small Java project
Enjoy the benefits of Gradle
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Without cache
With cache

36. Enjoy the benefits of Gradle
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Without cache
With cache
Build time gained @ Bonitasoft on a project with
30 modules: Java + react + custom

37. No tools to install
Gradle distribution and other tooling
are downloaded and cached
Enjoy the benefits of Gradle
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38. Each developer can focus on what matters to them
Don't need to rebuild everything locally
Enjoy the benefits of Gradle
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39. No need to read setup
documentation on every project
Just run ./gradlew build
Enjoy the benefits of Gradle
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40. Yes we can build everything with gradle!
Yes it is useful when mixing technologies!
Use the build cache!
Conclusion
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41. Thank you!
Baptiste Mesta
Twitter: @baptistemesta
Github: baptistemesta
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42. Work avoidance
First build
Enjoy the benefits of Gradle
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43. Work avoidance
Second build
Enjoy the benefits of Gradle
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44. Work avoidance
After some sources are modified
Enjoy the benefits of Gradle
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