devoxxfr2016-jigsaw-gradle
devoxxfr2016-jigsaw-gradle
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devoxxfr2016-jigsaw-gradle
On Github melix / devoxxfr2016-jigsaw-gradle
Résoudre le puzzle Jigsaw avec Gradle
Cédric Champeau (@CedricChampeau), Gradle Inc.
Who am I
speaker {
name 'Cédric Champeau'
company 'Gradle Inc'
oss 'Apache Groovy committer',
successes 'Static type checker',
'Static compilation',
'Traits',
'Markup template engine',
'DSLs'
failures Stream.of(bugs),
twitter '@CedricChampeau',
github 'melix',
extraDescription '''Groovy in Action 2 co-author
Misc OSS contribs (Gradle plugins, deck2pdf, jlangdetect, ...)'''
}Groovy in Action 2
Coupon: ctwdevoxxfr
What is Gradle?
Emerge from Build Hell
Unified, fast, reproducible builds
Cross-platform
Language agnostic
Project Jigsaw
-
Modularity for the Java platform
Reliable configuration (goodbye classpath)
Strong encapsulation (goodbye com.sun)
-
Enforce strict boundaries between modules
compile-time
run-time
Jigsaw modules
Declaring a module
module com.foo.bar {
requires org.baz.qux;
exports com.foo.bar.alpha;
exports com.foo.bar.beta;
}A module
-
Declares dependencies onto other modules
optionally transitive (public)
Declares a list of packages it exports
will be found on modulepath
Why it’s going to break your apps
Exports are package based
A non-exported package is not visible to consumers
2 modules cannot export the same packages
2 modules cannot have the same internal packages
Death to split packages.
How Gradle will help?
Find a smooth migration path
Prepare today, migrate when ready
Gradle’s software model
Idea : we’re building software, so let’s model software
Describe what rather than how
Leverage conventions
Work in progress
A simple project
Internal APIs
Internal APIs maintenance nightmare
Declaring internal APIs
Compile avoidance
Compile avoidance benefits
-
Doesn’t recompile dependents if:
method body changes
parameter names change
method order changes
private method added/removed
In short: if API stable, do nothing
Declaring target platforms
Why does Gradle help?
Add targetPlatform 'java9'
Generate module descriptor automatically?
Profit!
Trying it out
What’s next?
Automatic toolchain selection
Support for modulepath
Support for jimage and jlink
Support for modulepath
Toolchain provisioning
Be involved
Specs can be found on our GitHub repo
Questions
We’re hiring!
Thank you!
Slides and code : https://github.com/melix/devoxxfr2016-jigsaw-gradle
Gradle documentation : http://gradle.org/documentation/
State of the module system: http://openjdk.java.net/projects/jigsaw/spec/sotms
Follow me: @CedricChampeau