Distributed Refactoring with Gradle Lint
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This document discusses Netflix's use of Gradle Lint to enable distributed refactoring. Gradle Lint allows Netflix to define custom linting rules to validate and refactor Gradle builds across their monorepo. The document provides an example of a rule to enforce that all WAR projects are published to their binary repository. It demonstrates how the rule can be made more complex by applying the change immediately, only if needed, or replacing the WAR plugin entirely.
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Distributed Refactoring with Gradle Lint
- 1. DISTRIBUTED REFACTORING WITH GRADLE LINT Jon Schneider Netflix Engineering Tools @jon_k_schneider GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 3. NETFLIX IS KNOWN FOR RAPID INNOVATION. GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 4. WE WANT TO MINIMIZE DRAG FROM LATE ADOPTERS. GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 5. NETFLIX CULTURE IS FREEDOM AND RESPONSIBILITY GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 6. GRADLE LINT ALLOWS US TO DISTRIBUTE CHANGE. GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 7. THE UNUSED DEPENDENCIES RULE HELPS MAINTAIN GOOD DEPENDENCY HYGIENE. GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 8. GRADLE LINT SUPPORTS SHIPPING METRICS TO nebula.metrics GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 9. CREATING A MORE COMPLEX RULE "All wars should be published to our binary repository" GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 10. 1: APPLY IMMEDIATELY AFTER THE WAR PLUGIN class AllWarsShouldBePublishedRule extends GradleLintRule { @Override void visitApplyPlugin(MethodCallExpression call, String plugin) { if(plugin == 'war') { addBuildLintViolation('WARs must be published', call) .insertAfter(call, "apply plugin: 'netflix.war-publish'") } } } GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 11. 2: APPLY ONLY IF IT ISN'T ALREADY APPLIED class AllWarsShouldBePublishedRule extends GradleLintRule { @Override void visitApplyPlugin(MethodCallExpression call, String plugin) { if(plugin == 'war') bookmark('applyWar', call) else if(plugin == 'netflix.war-publish') bookmark('applyWarPublish', call) } @Override protected void visitClassComplete(ClassNode node) { if(bookmark('applyWar') && !bookmark('applyWarPublish')) { addBuildLintViolation('WARs must be published', call) .insertAfter(bookmark('applyWar'), "apply plugin: 'netflix.war-publish'") } } } GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 12. 3: REPLACE THE WAR PLUGIN ENTIRELY class AllWarsShouldBePublishedRule extends GradleLintRule { @Override void visitApplyPlugin(MethodCallExpression call, String plugin) { if(plugin == 'war') bookmark('applyWar', call) else if(plugin == 'netflix.war-publish') bookmark('applyWarPublish', call) } @Override protected void visitClassComplete(ClassNode node) { if(bookmark('applyWar') && !bookmark('applyWarPublish')) { addBuildLintViolation('WARs must be published', call) .replaceWith(bookmark('applyWar'), "apply plugin: 'netflix.war-publish'") } } } GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 13. 4: BECOME GRADLE MODEL AWARE class AllWarsShouldBePublishedRule extends GradleLintRule implements GradleModelAware { @Override void visitApplyPlugin(MethodCallExpression call, String plugin) { bookmark('lastApplyPlugin', call) } @Override protected void visitClassComplete(ClassNode node) { if(project.plugins.hasPlugin(WarPlugin) && !project.plugins.hasPlugin('netflix.war-publish')) { addBuildLintViolation('WARs must be published', call) .insertAfter( bookmark('lastApplyPlugin'), "apply plugin: 'netflix.war-publish'" ) } } } GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 14. GRADLE LINT IS OUR FIRST DISTRIBUTED REFACTORING TOOL. GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 15. THE EXPERIMENTAL LOCK PLUGIN IS ANOTHER EXAMPLE. github.com/nebula-plugins/lock- experimental GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 16. WE WANT AN EVENTUALLY CONSISTENT MONOREPO THROUGH DISTRIBUTED REFACTORING. GITHUB.COM/NETFLIXGRADLESUMMIT/LINT
- 17. JAVA POWER ASSERT WAS THE LEARNING GROUND. github.com/jkschneider/java-power-assert GITHUB.COM/NETFLIXGRADLESUMMIT/LINT