gradle 2.0 and beyond - berlin expert daysat #bedcon dependency resolve rules changing dependency...

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Gradle2.0andbeyondlatestefforts,currentstatus&roadmap

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RenéGröschkePrincipalEngineer@GradleInc.

@breskeby

breskeby

rene@gradle.com

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Gradleinanutshellcompletelyopensource

apache2licensed

drivenbyGradleInc.

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Gradleinanutshell

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Gradleinanutshell

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Gradleinanutshell

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GradleinanutshellAsimplejavaproject

apply plugin:"java"

version = file("version.txt").text

repositories { jcenter()}

dependencies { testCompile "junit:junit:4.+"}

task printVersion << { println "We're using - version '$version'!" }

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Gradle2.0Released1stJuly2014

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Gradle2.7Released14thSeptember2015

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Let’stakeacloserlookonPluginPortal

PlaySupport

GradleTestKit

EvenbetterDependencyManagement

NativeBuildSupportimprovements

EnhancedToolingAPI

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PluginPortal

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PluginPortalII

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PlaySupportDEMO

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ContinousMode> gralde build -t

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GradleTestKitFunctionaltestingofyourbuildlogic

def setup() { buildFile = testProjectDir.newFile('build.gradle')}

def "hello world task prints hello world"() { given: buildFile << """ task helloWorld { doLast { println 'Hello world!' } } """

when: def result = GradleRunner.create() .withProjectDir(testProjectDir.root) .withArguments('helloWorld') .build()

then: result.standardOutput.contains('Hello world!') result.task(":helloWorld").outcome == SUCCESS}

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DependencyManagement

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DependencyResolveRulesForcingconsistentversionforagroupoflibraries

configurations.all { resolutionStrategy.eachDependency { DependencyResolveDetails details -> if (details.requested.group == 'org.gradle') { details.useVersion '2.7' } }}

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DependencyResolveRulesUsingacustomversioningscheme

configurations.all { resolutionStrategy { eachDependency { DependencyResolveDetails d -> if (d.requested.version == 'default') { def version = findDefaultVersion(d.requested.group, d.requested.name) d.useVersion version } } }}

Object findDefaultVersion(String group, String name) { // some custom logic that resolves the default // version into a specific version "1.0"}

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DependencyResolveRulesChangingdependencygroupand/ornameattheresolution

configurations.all { resolutionStrategy { eachDependency { DependencyResolveDetails details -> if (details.requested.name == 'groovy-all') { //prefer 'groovy' over 'groovy-all': details.useTarget(group: details.requested.group, name: 'groovy', version: details.requested.version) } if (details.requested.name == 'log4j') { //prefer 'log4j-over-slf4j' over 'log4j', details.useTarget "org.slf4j:log4j-over-slf4j:1.7.10" } } }}

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ComponentSelectionRulesdependencies { compile 'org.slf4j:slf4j-api:+' testCompile 'junit:junit:4.11'}

configurations { all { resolutionStrategy { componentSelection { withModule("org.slf4j:slf4j-api") { selection -> if(selection.candidate.version == "1.7.10") { selection.reject("known buggy version") } } } } }}

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ArtifactQueryApitask resolveMavenPomFiles << { def componentIds = configurations.compile.incoming.resolutionResult.allDependencies.collect { it.selected.id }

def result = dependencies.createArtifactResolutionQuery() .forComponents(componentIds) .withArtifacts(MavenModule, MavenPomArtifact) .execute()

for(component in result.resolvedComponents) { component.getArtifacts(MavenPomArtifact).each { def pom = new XmlSlurper().parse(it.file) println pom.url } }}

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DependencySubstitutionAllowselasticdependencies

configurations.all { resolutionStrategy.dependencySubstitution { substitute project(":api") with module("org.utils:api:1.3") }}

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BuildshipEclipseplugindevelopedfromscratchbyGradleInc.

Partoftheeclipsefoundation

Wejustleftincubatorstatuslastweek

Shippedaspartofthemars.1release(25.09.2015)

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BuildshipDemo

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CurrentfocusNewGradlemodel

Dependencymanagement

Betterdomainmodelling

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Dependencymanagement

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Dependencymanagementtodealwithdependencieswehave:

group,name,version

classifier,customivyconfigurations

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Dependencymanagementtodealwithdependencieswehave:

group,name,version

classifier,customivyconfigurations

butweneedtodealwith:

java,groovy,scalaversions

android,nativetargetplatforms,allkindofjavascript

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Dependencymanagement

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DependencymanagementAllowvariantawaredependencymanagement

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DependencymanagementAllowvariantawaredependencymanagement

Supportarbitrarydimensions+custommetadata

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BetterdomainmodellingDomainmodellingisGradle’sstrength.

Wewantittobeevenbetter.

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BetterdomainmodellingDomainmodellingisGradle’sstrength.

Wewantittobeevenbetter.

Strongermodeling↪TheJARisnotthetaskthatcreatesit.

Cleanermodeling↪Avoidmixingexecutionconcernsintothedatamodel.

Collaborativemodeling↪IknowhowtodosomethingtoJARs.

Comprehensiblemodels↪WhoiscontributingtothecontentsofthisJAR?

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AnewGradlemodel

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Thecurrentmodelconfiguration➞execution

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Thecurrentmodelconfiguration➞execution

configuration:

input=buildlogic

output=buildmodel

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Thecurrentmodelconfiguration➞execution

configuration:

input=buildlogic

output=buildmodel

execution:

input=buildmodel

output=buildartifacts

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Limitationsofthecurrentmodel

implementationofdeclarativebuildapiishard

doneintheimperativeway

eagerness

lazyness

hooks

scaling

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ToohardForbuildengineersandbuildusers.

Wecandobetter.

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ThenewGradlemodelAnewapproachtotheconfigurationphase.

Really,thesamesolutionforthe"executionphase"appliedtoconfiguration.

Agraphofdependentfunctions

Aninterpretabledatamodel

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ThenewGradlemodelIEnterRuleSource

class PersonRules extends RuleSource { @Model void person(Person p) {}

@Mutate void setFirstName(Person p) { p.firstName = "John" }

@Mutate void createHelloTask(ModelMap<Task> tasks, Person p) { tasks.create("hello") { doLast { println "Hello $p.firstName $p.lastName!" } } }}

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ThenewGradlemodelIIthebuildscript

apply plugin: PersonRules

model { person { lastName = "Smith" }}

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ThenewGradlemodelIIIAndroidexperimentalplugin

model { android { compileSdkVersion = 22 buildToolsVersion = "22.0.1"

defaultConfig.with { applicationId = "com.example.user.myapplication" minSdkVersion.apiLevel = 15 targetSdkVersion.apiLevel = 22 versionCode = 1 versionName = "1.0" } }}

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ThenewGradlemodelIVasanenablerfor

buildmuchfasterandmorememoryefficient

justconfigurewhatisrequired

allowfundamentalparallization

providebetterdiagnostics

reusecachedconfiguration

…

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Gradle3.0

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otherfutureplansjigsawsupport

shareddistributedcache

nextlevelnativebuildsupport

moredaemonutilisation

continuedtoolingimprovements

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Linksandpointershttps://docs.gradle.org/current/userguide/new_model.html

http://gradle.org/roadmap

http://discuss.gradle.org/c/roadmap

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Q&A

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thanks!

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