Improve Build Times in Less Time

Build times are never as fast as we want but there is a lot you can do to improve them today without being a Gradle domain expert or buying everyone new computers! In this talk we'll cover a number of different tools, patterns, and common pitfalls to avoid for improving your build times quickly and take your (team's) developer productivity to the next level.

Transcript

1. Zac Sweers – Slack – @ZacSweers Improve Build Times in Less Time https://speakerdeck.com/zacsweers/improve-build-times-in-less-time
2. Non - goals
3. Goals
4. Goals https://twitter.com/inyaki_mwc/status/1486091593295695874?s=20&t=RgLHt1bWRcyLXp1oL4qL8A
5. Gradle Refresher
6. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
7. Tasks @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
8. Tasks • Inputs and outputs @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
9. Tasks • Inputs and outputs • Parallelizable @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
10. Tasks • Inputs and outputs • Parallelizable • Task action @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
11. Tasks • Inputs and outputs • Parallelizable • Task action • Cacheability @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
12. Tasks • Inputs and outputs • Parallelizable • Task action • Cacheability @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
13. Tasks • Inputs and outputs • Parallelizable • Task action • Cacheability • Con fi gured at con fi guration-time • Should be lazy! project.tasks.register<PrintMessageTask>("printMessage") { inputMessage.set("Hello World!") outputFile.set( project.layout.buildDirectory. fi le( "outputs/logs/message.txt")) }
14. Tasks • Inputs and outputs • Parallelizable • Task action • Cacheability • Con fi gured at con fi guration-time • Should be lazy! @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
15. Tasks • Inputs and outputs • Parallelizable • Task action • Cacheability • Con fi gured at con fi guration-time • Should be lazy! • Some common types (SourceTask, CompileTask, etc) @CacheableTask abstract class PrintMessageTask : DefaultTask() { @get:Input abstract val inputMessage: Property<String> @get:OutputFile abstract val outputFile: RegularFileProperty @TaskAction fun run() { val message = inputMessage.get() println(message) outputFile.asFile.get().writeText(message) } }
16. Tasks
17. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
18. Projects • Projects contain a set of tasks • Also contain things like source sets • Can have subprojects • Every directory in between is technically a project • Can have plugins applied to them
19. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
20. Plugins • Reusable implementations of gradle logic • Well known examples • Android Gradle Plugin (AGP) • Kotlin Gradle Plugin (KGP) • Many 1st-party plugins • Ours too! github.com/slackhq/slack-gradle-plugin plugins { kotlin("jvm") id("com.android.library") `java-platform` }
21. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
22. Conf i gurations • Essentially named fi le collections • “implementation”, “api”, etc dependencies { implementation("com.squareup.moshi:moshi:1.13.0") testImplementation("junit:junit:4.13") }
23. Conf i gurations • Essentially named fi le collections • “implementation”, “api”, etc dependencies { implementation("com.squareup.moshi:moshi:1.13.0") testImplementation("junit:junit:4.13") }
24. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
25. Conf i guration • Don’t confuse it with con fi gurations • The time spent from “go” to tasks actually executing
26. Conf i guration
27. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
28. Caching/Incremental Builds • Multiple kinds • build dir • Build cache • Local/Remote • Con fi guration cache • GRADLE_USER_HOME • Not Studio caches https://www.liutikas.net/2022/04/19/Caches-Everywhere.html
29. Wiping Studio caches does not f i x your build
30. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
31. Incremental Compilation (IC) • Multiple kinds • Java – Gradle – JavaCompile • Kotlin – JB/Google – KotlinCompile* • kaptGenerateStubs*Kotlin • kapt*Kotlin • compile*Kotlin • compile*JavaWithKotlinC
32. Incremental Compilation (IC) – Java • Compilation avoidance • “Can we not run?” • ABI-based • Incremental Compilation • “Can we only recompile a subset?” https://blog.gradle.org/incremental-compiler-avoidance :project-a :project-b
33. Incremental Compilation (IC) – Java • Compilation avoidance • “Can we not run?” • ABI-based • Incremental Compilation • “Can we only recompile a subset?” https://blog.gradle.org/incremental-compiler-avoidance :project-a :project-b
34. Incremental Compilation (IC) – Java • Compilation avoidance • “Can we not run?” • ABI-based • Incremental Compilation • “Can we only recompile a subset?” https://blog.gradle.org/incremental-compiler-avoidance :project-a :project-b
35. Incremental Compilation (IC) – Kotlin • Incremental only for now, no avoidance • Coming soon though! • Depends on producer-side IC data • This makes it tricky
36. Incremental Compilation (IC) – Kotlin • Incremental only for now, no avoidance • Coming soon though! • Depends on producer-side IC data • This makes it tricky :project-a :project-b
37. Incremental Compilation (IC) – Kotlin • Incremental only for now, no avoidance • Coming soon though! • Depends on producer-side IC data • This makes it tricky :project-a :project-b <IC data> produces consumes
38. Incremental Compilation (IC) – Kotlin • Incremental only for now, no avoidance • Coming soon though! • Depends on producer-side IC data • This makes it tricky :project-a :project-b <IC data> produces consumes
39. • Multiple kinds • Java – Gradle – JavaCompile • Kotlin – JB/Google – KotlinCompile* • kaptGenerateStubs*Kotlin • kapt*Kotlin • compile*Kotlin • compile*JavaWithKotlinC Incremental Compilation (IC) – Kotlin
40. kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC Incremental Compilation (IC) – Kotlin
41. kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC Incremental Compilation (IC) – Kotlin
42. kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC Incremental Compilation (IC) – Kotlin
43. kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC Incremental Compilation (IC) – Kotlin
44. kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC Incremental Compilation (IC) – Kotlin
45. compile*Kotlin Incremental Compilation (IC) – Kotlin
46. compile*Kotlin Incremental Compilation (IC) – Kotlin KotlinCompile
47. compile*Kotlin Incremental Compilation (IC) – Kotlin KotlinCompile kotlinc
48. Incremental Compilation (IC) – Kotlin kotlinc Frontend Backend AnalysisHandler IR Lowering https://medium.com/google-developer-experts/crash-course-on-the- kotlin-compiler-1-frontend-parsing-phase-9898490d922b Parse/PSI psi2ir
49. Incremental Compilation (IC) – Kotlin Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC
50. Incremental Compilation (IC) – Kotlin Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC
51. Incremental Compilation (IC) – Kotlin Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC
52. Incremental Compilation (IC) – Kotlin Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC
53. Incremental Compilation (IC) – Kotlin kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir
54. Incremental Compilation (IC) – Kotlin Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir kaptGenerateStubs*Kotlin kapt*Kotlin compile*Kotlin compile*JavaWithKotlinC
55. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
56. Daemons 😈 Gradle Daemon Kotlin Daemon
57. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
58. Annotation Processing javac/kapt KSP
59. Annotation Processing • Non - incremental • Two types of incremental • ISOLATING (Dagger, Moshi, etc) • AGGREGATING (Glide) javac/kapt KSP
60. Gradle Refresher • Tasks • Projects • Plugins • Conf i gurations • Conf i guration • Caching/Incremental Builds • Incremental Compilation (IC) • Daemons • Annotation Processing
61. Things That Are Hurting Your Build
62. Things That Are Hurting Your Build Things That Will Improve Your Build
63. Things That Are Hurting Your Build Things That Will Improve Your Build Things That Will Keep Your Build Fast
64. Things That Are Hurting Your Build
65. Annotation Processors
66. Annotation Processors
67. Kapt • Minimum 3 compilation tasks • 4 if you generate/have Java sources (hi, Dagger!) • Brittle to classpath changes • Disables new FIR • Keeps appearing in later problems as a multiplier
68. Frontend Backend AnalysisHandler IR Lowering Parse/PSI psi2ir
69. Frontend Stub gen .java f i les
70. kotlinc Frontend Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les
71. kotlinc 
 (Frontend only) Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les
72. kotlinc 
 (Frontend only) Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les javac compileJava More 
 .class f i les
73. kotlinc 
 (Frontend only) Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les javac compileJava More 
 .class f i les
74. KSP https://github.com/google/ksp
75. kotlinc 
 (Frontend only) Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les javac compileJava More 
 .class f i les
76. kotlinc 
 (Frontend only) KSP .java/.kt f i les javac javaCompile More .class f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les
77. kotlinc 
 (Frontend only) KSP .kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les
78. kotlinc 
 (Frontend and Backend) compileKotlin .class f i les all - open Kotlinx - serialization parcelize moshi etc. https://blog.bnorm.dev/writing-your-second-compiler- plugin-part-1
79. kotlinc 
 (Frontend only) Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les javac compileJava More 
 .class f i les
80. kotlinc 
 (Frontend only) Stub gen .java f i les Kapt (javac) Kapt .java/.kt f i les kotlinc 
 (Frontend and Backend) compileKotlin .class f i les javac compileJava More 
 .class f i les https://github.com/square/anvil
81. kotlinc 
 (Frontend and Backend) compileKotlin .class f i les Anvil runs here https://github.com/square/anvil
82. buildSrc
83. buildSrc • Regularly invalidates buildscript classpath • It’s like occasionally having - - rerun - tasks • What’s the alternative? • Version catalogs for deps • Separate repo + artifactory for plugins
84. buildSrc • What about live testing? • Use included builds if ("slack.plugin.internal.localPath" in extra.properties) { val path = (extra["slack.plugin.internal.localPath"] as String) includeBuild(path) { dependencySubstitution { substitute(module("slack.internal.gradle:slack-plugin-internal")) .using(project(":slack-plugin-internal")) } } }
85. ./gradlew clean
86. ./gradlew clean
87. Cleaning does not f i x your build
88. Don’t mix IDE and command line builds
89. Don’t mix IDE and command line builds https://issuetracker.google.com/ issues/164145066
92. “What do you think you’d produce if you were hammered?”
 – Chet, certi fi ed Gradle expert™
93. Move NDK projects to a separate repo
94. Gradle API Surface Area
95. Gradle API Surface Area con fi gurations.all { } extensions.get(...) tasks.getByName(...) var property: String con fi gurations.con fi gureEach { // Lazy! } extensions.con fi gure(...) { // Lazy! } tasks.named(...) { // Lazy! } val property: Property<String> http://autonomousapps.com/blog/rules-for- gradle-plugin-authors.html
96. Incremental Compilation Issues https://www.zacsweers.dev/ optimizing-your-kotlin-build/
97. Incremental Compilation Issues • Pure Java projects break IC on every project that depends on them (directly or transitively) • Java - only, resources - only, etc • Workaround: add a Kotlin f i le • KT-30980 KT-38622 • Code gen tools generating non - deterministic outputs • Resource ABI changes break IC (KT-40772) • Cleaning https://www.zacsweers.dev/ optimizing-your-kotlin-build/
98. Task Issues
99. Identifying Task Issues
100. Identifying Task Issues ./gradlew :app:assembleDebug Build 1
101. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
102. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
103. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
104. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
105. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
106. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
107. Identifying Task Issues ./gradlew :app:assembleDebug Build 1 Build 2
108. Identifying Caching Issues ./gradlew :app:assembleDebug Build 1 Build 2
109. Identifying Caching Issues ./gradlew clean Build 1 Build 2
110. Identifying Caching Issues ./gradlew :app:assembleDebug Build 1 Build 2
111. Identifying Caching Issues ./gradlew :app:assembleDebug Build 1 Build 2
112. Identifying Caching Issues ./gradlew :app:assembleDebug Build 1 Build 2 🗂 Di ff erent directory
113. Identifying Caching Issues ./gradlew :app:assembleDebug Build 1 Build 2 ☁ CI
114. Corporate Bloatware
115. Literally bugs https://www.zacsweers.dev/ optimizing-your-kotlin-build/
116. Literally bugs • Kotlin build cache entries often break incremental compilation. KT-34862 • Gradle AbstractCompile tasks (i.e. KotlinCompile) are sensitive to classpath jar ordering. gradle/gradle#15626 • Error - prone freeCompilerArgs use. KT-41985 https://www.zacsweers.dev/ optimizing-your-kotlin-build/
117. Old tools!
118. Old tools • JDK • We are on 17, moving to 18 • Kotlin • Gradle • Gradle plugins • Compiler plugins • Literally anything on your buildscript classpath
119. Tune GCs org.gradle.jvmargs=... -XX:+UseG1GC \ -XX:+UnlockExperimentalVMOptions \ -XX:G1NewSizePercent=67 \ -XX:G1MaxNewSizePercent=67 https://github.com/slackhq/slack-gradle-plugin/blob/main/slack- plugin/src/main/kotlin/slack/gradle/tasks/BootstrapTask.kt
120. Tune Daemons org.gradle.jvmargs=... -Xms2g -Xmx8g kotlin.daemon.jvmargs=... -Xms6g -Xmx24g https://github.com/slackhq/slack-gradle-plugin/blob/main/slack- plugin/src/main/kotlin/slack/gradle/tasks/BootstrapTask.kt
121. (CI only)
122. Don’t merge main on CI builds
123. Lint memory usage
124. Lint memory usage org.gradle.jvmargs=... -XX:MaxMetaspaceSize=1g
125. Tune Daemons org.gradle.jvmargs=... -Xms24g -Xmx24g kotlin.daemon.jvmargs=... -Xms4g -Xmx4g https://github.com/slackhq/slack-gradle-plugin/blob/main/slack- plugin/src/main/kotlin/slack/gradle/tasks/BootstrapTask.kt
126. Jacoco
127. Jacoco
128. Things That Are Hurting Your Build
129. Things That Will Improve Your Build
130. Build caching org.gradle.caching=true
131. Remote Build caching buildCache { local { isEnabled = true } remote<HttpBuildCache> { isEnabled = !gradle.startParameter.isOf fl ine setUrl(“…”) // only write to cache from build server isPush = isCi credentials { username = ... password = ... } } }
132. android - cache - f i x - gradle - plugin https://github.com/gradle/android-cache- fi x-gradle-plugin
133. Virtual File System (VFS) org.gradle.vfs.watch=true https://blog.gradle.org/introducing- fi le- system-watching
134. Conf i guration Caching org.gradle.unsafe.con fi guration-cache=true https://blog.gradle.org/introducing- con fi guration-caching
135. Focus https://github.com/dropbox/focus ./gradlew :my-feature:sample:focus
136. Single - variant Libraries androidComponents { beforeVariants(selector().withBuildType("debug")) { builder -> builder.enable = false } }
137. Modularization
138. Modularization 🔥
139. Apple Silicon
140. Non - transitive R classes
141. Non - transitive R classes • 5.5MB or 8.5% of Slack APK size • 14% incremental build time improvement w/ layout change • import slack.l10n.R as L10nR
142. Disable Android Features # Build features that are disabled by default in all projects android.defaults.buildfeatures.aidl=false android.defaults.buildfeatures.buildcon fi g=false android.defaults.buildfeatures.renderscript=false android.defaults.buildfeatures.resvalues=false android.defaults.buildfeatures.shaders=false
143. Prefer JVM-only Projects
144. Make A Platform Plugin import slack.gradle.Platforms plugins { id("slack.base") `java-platform` } val catalog = extensions. fi ndByType<VersionCatalogsExtension>() ?. fi nd("libs") ?: error("Could not fi nd libs catalog!") Platforms.applyFromCatalog(project, catalog.get()) https://github.com/slackhq/slack-gradle-plugin/blob/main/slack- plugin/src/main/kotlin/slack/gradle/Platforms.kt
145. Other Things • Remove jetif i er (use `checkJetif i er` task in AGP 7.1) • api/impl projects • api/impl conf i gurations don’t avoid compilations, just control visibility •
146. Things That Will Improve Your Build
147. Things That Will Keep Your Build Fast
148. Gradle Enterprise
149. Gradle Enterprise • Remote build cache • Build scans • Compare builds • Trends/insight/visualization • Export API • Critical path • Tags/custom values • Debugging (everyone has a scan ready)
150. Benchmarks https://github.com/gradle/gradle-pro fi ler
151. Benchmarks
152. Benchmarks
153. Benchmarks
154. Telemetry + Check - ins
155. Telemetry • Local vs CI (GE tag) • System arch (rolling out M1 Macs) • Thermals • https: / / github.com/slackhq/slack - gradle - plugin/blob/main/slack - plugin/src/main/kotlin/slack/gradle/util/ThermalsWatcher.kt • VCS state • Env info (OS, version, etc)
156. Gradle - doctor https://runningcode.github.io/gradle-doctor/
157. TaskUpToDateValidator https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-main/buildSrc/ private/src/main/kotlin/androidx/build/uptodatedness/TaskUpToDateValidator.kt
158. modules - graph - assert https://github.com/jraska/modules-graph-assert
159. modules - graph - assert https://github.com/jraska/modules-graph-assert moduleGraphAssert { maxHeight = 4 allowed = [':.* -> :core', ':feature.* -> :lib.*'] // regex to match module names restricted = [':feature-[a-z]* -X> :forbidden-to-depend-on'] // regex to match module names con fi gurations = ['api', 'implementation'] // Dependency confs to look. }
160. modules - graph - assert https://github.com/jraska/modules-graph-assert
161. modules - graph - assert
162. dependency - analysis - android - gradle - plugin https://github.com/autonomousapps/dependency-analysis-android-gradle-plugin
163. dependency - analysis - android - gradle - plugin https://github.com/slackhq/slack-gradle-plugin/blob/main/slack-plugin/src/main/ kotlin/slack/dependencyrake/DependencyRake.kt /** * Task that consumes the generated advice report json generated by `AdviceTask` * and applies its advice to the project build fi le. This is usually not run * directly, but rather added as a fi nalizer to the `AdviceTask` it reads from. */ class RakeDependencies(...) : AbstractPostProcessingTask() { // ... }
164. https://github.com/slackhq/slack-gradle-plugin/blob/main/slack-plugin/src/main/ kotlin/slack/dependencyrake/DependencyRake.kt
165. https://github.com/slackhq/slack-gradle-plugin Convention Plugins
166. https://github.com/slackhq/slack-gradle-plugin Convention Plugins plugins { id("com.android.library") kotlin("android") id("com.squareup.anvil") } android { namespace = "slack.libraries.emoji.api" compileSdk = 31 defaultCon fi g { minSdk = 26 } buildTypes { debug { matchingFallbacks.add("release") } } compileOptions { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } } androidComponents { beforeVariants { builder -> if (builder.buildType == "debug") { builder.enable = false } else { builder.enableAndroidTest = hasProperty("slack.libraryWithAndroidTest") } } } anvil { generateFactories = true } dependencies { compileOnly(libs.dagger.dagger) implementation(projects.libraries.emoji.data) implementation(projects.libraries.foundation.slackCommons.android) implementation(projects.libraries.imageLoading) implementation(projects.libraries.model) implementation(projects.libraries.telemetry.telemetryPublic) implementation(libs.rxJava.java3) }
167. https://github.com/slackhq/slack-gradle-plugin Convention Plugins plugins { id("slack.base") id("com.android.library") kotlin("android") } slack { features { dagger() } } dependencies { implementation(projects.libraries.emoji.data) implementation(projects.libraries.foundation.slackCommons.android) implementation(projects.libraries.imageLoading) implementation(projects.libraries.model) implementation(projects.libraries.telemetry.telemetryPublic) implementation(libs.rxJava.java3) }
168. Future https://slack.engineering/shadow-jobs/
169. Future New Kotlin IC • Consumer - side IC based on classpath snapshot • Unstable preview available in 1.6.20, targeting 1.7 • Solves many producer - side issues (Java projects, caching, etc) • True compilation avoidance in some cases ( ! ! ) kotlin.incremental.useClasspathSnapshot=true https://youtrack.jetbrains.com/issue/KT-45777
170. Future New Kotlin IC https://youtrack.jetbrains.com/issue/ KT-45777#focus=Comments-27-6004789.0-0
171. Future New Kotlin IC
172. Future New Kotlin IC
173. Future K2 Compiler • New Kotlin compiler frontend (aka FIR) • Promises 2-4x build speed improvements • Preview coming in 1.7 https://blog.jetbrains.com/kotlin/2021/10/the-road-to-the-k2-compiler/
174. Future Conf i guration Caching org.gradle.unsafe.con fi guration-cache=true https://blog.gradle.org/introducing- con fi guration-caching
175. Future Gradle Project Isolation • Conf i guration cache pt. 2 • True project isolation, will allow parallel conf i guration and tooling model creation (aka Studio sync) • WIP. TL;DR don’t use allprojects/subprojects https://gradle.github.io/con fi guration-cache/#project_isolation systemProp.org.gradle.unsafe.isolated-projects=true
176. –You, an upstanding citizen “How can I help?”
177. How can I help? • Report bugs! • Open source your build stuff • Test/prepare for new features • Use modern APIs • Make your own convention plugin • File feature requests *
178. –You, an upstanding citizen “What should I do today?”
179. What should I do today? • Audit deprecated/eager APIs • Update your tools (JDK, Gradle, Kotlin, etc) • Swap KSP for kapt where possible • Single - variant libraries • Disable android features by default • Fix java - only projects breaking IC • Dependency analysis to remove unused deps
180. –You, a future upstanding citizen “What should I do tomorrow?”
181. What should I do tomorrow? • Learn some Gradle • Reduce/remove Kapt • Create gradle - prof i ler scenarios • Modularization • Gradle Enterprise • Apple Silicon • Incorporate new tools prep in planning • OSS your stuff
182. People to follow for more! • Tony Robalik – @AutonomousApps – https: / / dev.to/autonomousapps • Aurimas Liutikas – @_aurimas – https: / / w w w .liutikas.net/blog - posts • Iñaki Villar – @inyaki_mwc • Ryan Harter – @rharter – http: / / ryanharter.com/ • Xavier Ducrohet – @droidxav – https: / / developer.android.com/reference/tools/gradle - api • “Xav says read the docs and stop touching internal APIs” • Ivan Gavrilovic – @gavra0 • Cesar Puerta – @CesarDielo • Nelson Osacky – @nellyspageli – https: / / osacky.com/ • Jendrik Johannes – @jeoj – youtube.com/c/onepieceSoftware – github.com/jjohannes
183. Zac Sweers – Slack – @ZacSweers Improve Build Times in Less Time