C C B B T T Jan Christopher Vogt / @cvogt - - PowerPoint PPT Presentation

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C C B B T T Jan Christopher Vogt / @cvogt - - PowerPoint PPT Presentation

Mar 14, 2024 337 likes •756 views

A Vision for Scala Builds fun, fast, intuitive, composable, statically checked I am releasing 1.0-beta today C C B B T T Jan Christopher Vogt / @cvogt https://github.com/cvogt/talk-2016-03-04 NESCALA MARCH 4TH 2016

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NESCALA MARCH 4TH 2016 PHILADELPHIA https://github.com/cvogt/talk-2016-03-04

A Vision for Scala Builds

Jan Christopher Vogt / @cvogt

fun, fast, intuitive, composable, statically checked

I am releasing 1.0-beta today

C C B B T T

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Jan Christopher Vogt ai Slick, Martin’s lab, Compossible Records, Scala Forklift, MavenSearch

Who am I? m m a a g g i i c c a a l l l l y y s s c c h h e e d d u u l l e e m m e e e e t t i i n n g g s s

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What’s the goal here?

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x.ai

25 Engineers, lots of Scala projects

(CBT is my personal, free-time side-project)

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CBT Few, simple building blocks.

  • Easy. Fast. Idiomatic Scala.

Flexible and compositional. Easy code and contribution.

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  • build composition!
  • Scala library of functionality
  • builds scripts written in vanilla Scala

(builds = classes, “tasks” = methods)

  • configuration via inheritance

(shallow layer)

  • cli interop

Building blocks

Similar to SBT 0.7. (back in 2011)

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  • resident JVM via Nailgun
  • caching of dependencies
  • artifacts/pom on disk
  • classloader in memory
  • run zinc only when changed
  • concurrency (opt-in)
  • native OSX file change triggers

Fast

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  • focus!
  • tiny: < 1500 LOC
  • easy code! Scala beginners can understand.
  • bootstraps from source: install = git clone

Easy to understand and contribute

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Supported features right now

  • compile, run, test, scaladoc
  • package jars
  • publish to sonatype
  • download jars from maven
  • file change triggers
  • build composition (dependent builds)
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Missing features (likely easy to add)

  • 1. configurable resolvers
  • 2. cross scala version builds
  • 3. scalajs support
  • 4. repl
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  • some aspects of
  • usability
  • logging
  • only tested on OSX
  • only used by me :)

Rough edges

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Live Demo

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check

  • README.txt

Getting started

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Philosophy and design

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Builds aren’t special. Just code.

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  • zinc
  • Scala
  • BarbaryWatchService
  • ammonite-ops (still)

Dependencies

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Custom maven resolver

  • new implementation
  • proper caching
  • (some feature limitation still)
  • Coursier as a drop-in
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Fast re-compilation triggers

  • watches sources of project, build, CBT
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  • totally opt-in
  • requires care regarding IO
  • per-run result cache

Parallel task execution

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Build composition

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Build composition

assembly-project project1 project2 shared project3 Can be separate git repos each one compiles

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Build composition

Simple building block, many uses:

  • 1. Dependent builds
  • 2. Multi-project builds
  • 3. Tests
  • 4. Builds of builds
  • 5. Whenever A needs to compile before B

Same rules everywhere

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Current limitations

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Concurrent builds

  • not supported yet
  • should be fine via dependency graph
  • requires internal care regarding caches
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Re-configuration

Inheritance is static Re-configuration through static code

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e.g. provide version from command line But how? Members are already hard-wired.

Dynamic re-configuration

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e.g. automatically append “-SNAPSHOT” to the version number for snapshot builds But how? Code does not know the eventual class.

Ad-hoc re-configuration

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Candidate solutions

  • messy, easy, powerful: mutable members
  • clean, easy, limited: hard-coded use cases
  • clean, hard, powerful: code-generation

(it’s a build tool after all)

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Example: code-generation

class BasicBuild(...){ def publishSnapshot: Unit = { val reconfiguredBuild = this.mixin( new BasicBuild{

  • verride def version = super.version+“-SNAPSHOT”

} ): reconfiguredBuild b.publish } }

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How to contribute

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The code is simple

  • CBT is distributed as source. You clone it.
  • check DEVELOPER_GUIDE.txt
  • read the code: clean and easy.
  • change it, CBT re-builds itself on use
  • submit a PR
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  • very easy
  • write traits to mix into builds
  • publish as libs on maven
  • depend on them in your BuildBuild

Write extensions

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Diving into the source

If time permits. Otherwise unconference session.

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  • allow different CBT and Scala versions
  • concurrent builds
  • Coursier integration
  • more tests
  • Scala Days 2016 surprise feature

Near future work

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  • git(hub) dependencies
  • sbt interop

Future work

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CBT?!?

Compositional Build Tool Complex Build Tool ;)? Cool Build Tool CBT Build Tool Compossible Build Tool

COmposition Possible

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CBT!

For now: “Chris’ Build Tool”

if( year == 2017 && cbt.hasCommunity ) cbt.setName( “Community Build Tool” )

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NEScala special offer: I’ll make your CBT builds work. Talk to me.

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  • This is BETA - let the bug hunting begin
  • report issues or submit PRs (easy ;)).
  • let’s get it solid until Scala Days

git push What’s next

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chris @ human.x.ai

Senior Backend Engineer

Twitter: @cvogt @xdotai Github: @cvogt Slides, etc W W e e a a r r e e h h i i r r i i n n g g ! !

https://github.com/cvogt/cbt