Gradle on Steroids

Slides for the talk about optimising Gradle builds, presented at GDG BLRDROID'S DEVFEST 2016.

Transcript

1. Gradle on Steroids Sumit Das @6amedev Chirag Aggarwal @chi6rag
2. Disclaimer Your Mileage May Vary
3. Always Measure First
4. Gradle Build Lifecycle Phases Initialization Configuration Execution
5. Initialization and Configuration The overhead tax you have to pay whenever you invoke gradle
6. Measuring the overhead Test Subject: Google IO App - 28 libraries - 53149 method references
7. Measuring the Overhead The --dry-run command line flag skips running all the tasks $ ./gradlew assembleDebug --dry-run :android:validateDebugSigning SKIPPED :android:packageDebug SKIPPED :android:zipalignDebug SKIPPED :android:assembleDebug SKIPPED BUILD SUCCESSFUL Total time: 4.256 secs
8. ./gradlew assembleDebug -dry-run --configure-on-demand
10. ./gradlew build --dry-run ... BUILD SUCCESSFUL Total time: 4.286 secs Without --configure-on-demand ./gradlew build --dry-run --configure-on-demand ... BUILD SUCCESSFUL Total time: 3.574 secs With --configure-on-demand
11. ./gradlew assembleDebug -dry-run --configure-on-demand --daemon
12. ./gradlew build --dry-run --configure-on-demand --no-daemon ... BUILD SUCCESSFUL Total time: 3.63 secs Without --daemon ./gradlew build --dry-run --configure-on-demand --daemon ... BUILD SUCCESSFUL Total time: 1.709 secs With --daemon
13. Use latest Gradle Distribution
14. ./gradlew build --dry-run --configure-on-demand --daemon ... BUILD SUCCESSFUL Total time: 1.709 secs Gradle 2.2.1 ./gradlew build --dry-run --configure-on-demand --daemon ... BUILD SUCCESSFUL Total time: 1.104 secs Gradle 2.14
15. #Tue Dec 02 14:11:25 EST 2014 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip Gradle Version Upgrade Gradle Version in gradle/wrapper/gradle-wrapper.properties
16. Issues with using dynamic versions dependencies { compile 'com.google.code.gson:gson:2.+' }
17. Issues with using dynamic versions dependencies { compile 'com.google.code.gson:gson:2.7.1' }
18. ./gradlew assembleDebug -dry-run --configure-on-demand --daemon --offline
19. ./gradlew assembleDebug -dry-run --configure-on-demand --daemon --offline --parallel
20. ...but when is it useful? • Multi Module build • Decoupled Modules
21. Really Large Projects with Multidex Enabled
22. Test Subject: really-large-android-project (artificial) Info: 150k method references Total Dex Files: 3 BUILD SUCCESSFUL Total time: 2 mins 14.147 secs
23. productFlavors { dev { minSdkVersion 21 } prod { minSdkVersion 14 } } dependencies { compile 'com.android.support:multidex:1.0.0' }
24. Test Subject: really-large-android-project (artificial) Info: 150k method references Total Dex Files: 3 BUILD SUCCESSFUL Total time: 1 min 40.281 secs
25. Including dependencies only for specific build types / flavors
26. dependencies { compile 'com.mixpanel.android:mixpanel-android:4.1' }
27. public class MainActivity extends AppCompatActivity { private MixpanelAPI mixpanelAPI; private Button buttonTrigger; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String token = context.getString(R.string.mixpanel_token) mixpanelAPI = MixpanelAPI.getInstance(this, mixpanelToken); mixpanelAPI.track(“some_event”, new JSONObject()); } }
28. Including dependencies only for specific build types / flavors
29. dependencies { releaseCompile 'com.mixpanel.android:mixpanel-android:4.1' }
30. public class MainActivity extends AppCompatActivity { private MixpanelAPI mixpanelAPI; private Button buttonTrigger; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String token = context.getString(R.string.mixpanel_token) mixpanelAPI = MixpanelAPI.getInstance(this, mixpanelToken); mixpanelAPI.track(“some_event”, new JSONObject()); } }
32. Debug Mixpanel Tracker public class MixpanelAnalyticsTracker extends AnalyticsTracker { public MixpanelAnalyticsTracker(Context context) { super(context); } @Override public void track(String eventName, JSONObject jsonObject) { } }
33. Release Mixpanel Tracker public class MixpanelAnalyticsTracker extends AnalyticsTracker { private final MixpanelAPI mixpanelAPI; public MixpanelAnalyticsTracker(Context context) { super(context); String mixpanelToken = context.getString(R.string.mixpanel_name) mixpanelAPI = MixpanelAPI.getInstance(context, mixpanelToken); } @Override public void track(String eventName, JSONObject jsonObject) { mixpanelAPI.track(eventName, jsonObject); } }
34. settings.gradle: include ‘:app’, ‘:guava1’, ‘:guava2’ app/build.gradle dependencies { compile project(‘:guava1’) compile project(‘:guava2’) } Utilizing Pre-Dexing
35. Apply Plugins Judiciously
36. Apply Plugins Judiciously Android Maps Utils : Polyline Decoding com.google.maps.android:android-maps-utils:0.4.4 Methods count: 1228
37. Google Play Services : Maps Don’t use com.google.android.gms:play-services:9.4.0 Methods count : 74646 Use com.google.android.gms:play-services-maps:9.4.0 Methods count : 15306 Apply Plugins Judiciously
38. Avoid Expensive or Blocking Tasks
39. def cmd = 'git rev-list HEAD --count' def gitVersion = cmd.execute().text.trim().toInteger() android { defaultConfig { versionCode gitVersion } }
40. Splitting build.gradle CI Gradle File Developer Gradle File CI Gradle File Developer Gradle File
41. CI Gradle Building all flavours and variants. Dev Gradle Generating test coverage reports.
42. CI Gradle Dev Gradle Expensive/blocking tasks Compiling libraries: Crashlytics, New Relic, etc.
43. But what happens when you add a dependency to Dev gradle file and forget to add it in CI gradle file? Build Fails
44. Sharing common dependencies between Dev and CI gradle files dependencies.gradle
45. dependencies { compile commonLibraries.retrofit compile commonLibraries.dagger compile commonLibraries.timber testCompile testLibraries.junit testCompile testLibraries.mockitoCore androidTestCompile testLibraries.junit androidTestCompile testLibraries.mockWebServer androidTestCompile testLibraries.espressoIntents } dependencies.gradle
46. Is maintaining two gradle files the right approach? - It’s a hack - Needs a lot of discipline and communication across the team - Lot of code duplication
47. Build-Type specific configurations: Feature debug staging/release Merging the gradle files Dexguard Shrinking Resources Crashlytics
48. Using gradle tasks for: - Handpicking build variant(s) while building project, preventing the generation of all possible build variants on dev builds. - Generating Jacoco reports only on CI Merging the gradle files
49. Configuring dependencies for specific build variant or testing source set. debugCompile "com.android.support:multidex:1.0.0" debugCompile "com.squareup.leakcanary:leakcanary-android:1.5" testCompile "junit:junit:4.12" testCompile "org.mockito:mockito-core:1.10.19" Merging the gradle files
50. Centralising Libraries libraries.gradle
51. Centralising Libraries • In multi-module projects, it is very effective in restricting usage to a single version of a given library. • It makes maintaining and upgrading libraries a lot easier.
52. libraries.gradle ext { supportVersion = "23.4.0" commonLibraries = [ gson : "com.google.code.gson:gson:2.6.2", eventbus : "org.greenrobot:eventbus:3.0.0", supportv4 : "com.android.support:support-v4:${supportVersion}", cardView : "com.android.support:cardview-v7:${supportVersion}", design : "com.android.support:design:${supportVersion}" ] testLibraries = [ junit : "junit:junit:4.12", mockitoCore : "org.mockito:mockito-core:1.10.19", dexMakerMockito : "com.google.dexmaker:dexmaker-mockito:1.2" ] }
53. Grouping libraries by vendor for compatibility
54. ext { version = '23.4.0' supportLibraries = [ cardView : "cas:cardview-v7:${version}", recyclerView: "cas:recyclerview-v7:${version}", design : "cas:design:${version}" ] } • com.android.support is replaced with cas
55. Removing unused dependencies
56. Boost daemon’s heap size Invest in fast CPUs Other Performance Tweaks
57. Boost daemon’s heap size Invest in fast CPUs Other Performance Tweaks
58. Thank you.