RUM-16056 Add @HotMethod annotation and HotMethodIllegalCall detekt rule
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| /* | ||
| * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0. | ||
| * This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| * Copyright 2016-Present Datadog, Inc. | ||
| */ | ||
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| package com.datadog.android.internal.lint | ||
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| /** | ||
| * Marks a method as a hot path — one that can be invoked on every frame or touch event. | ||
| * | ||
| * Implementations must avoid heap allocations, blocking operations, and any work | ||
| * that introduces GC pressure. The IDE/Lint will highlight annotated methods as a | ||
| * reminder to reviewers. | ||
| * | ||
| * @property message A short description of why this method is hot (e.g. "called per frame by JankStats"). | ||
| */ | ||
| @Retention(AnnotationRetention.SOURCE) | ||
| @Target(AnnotationTarget.FUNCTION) | ||
| annotation class HotMethod(val message: String) | ||
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| build: | ||
| maxIssues: 0 | ||
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| config: | ||
| validation: true | ||
| warningsAsErrors: true | ||
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| comments: | ||
| active: true | ||
| AbsentOrWrongFileLicense: | ||
| active: true | ||
| licenseTemplateFile: 'license.template' | ||
| licenseTemplateIsRegex: false | ||
| excludes: | ||
| # Gradle build outputs and generated artifacts. | ||
| - '**/build/**' | ||
| # Auto-generated Kotlin model fixtures produced by the buildSrc JSON-to-Kotlin code generator. | ||
| - '**/buildSrc/src/test/kotlin/com/example/model/**' | ||
| # Fixture files for the NoOpFactory annotation processor tests, read as text data rather than compiled. | ||
| - '**/tools/noopfactory/src/test/resources/**' | ||
| # Vendored test files ported from the upstream dd-trace-java library. | ||
| - '**/features/dd-sdk-android-trace-internal/src/test/kotlin/com/datadog/trace/**' | ||
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| complexity: | ||
| active: false | ||
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| coroutines: | ||
| active: false | ||
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| empty-blocks: | ||
| active: false | ||
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| exceptions: | ||
| active: false | ||
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| naming: | ||
| active: false | ||
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| potential-bugs: | ||
| active: false | ||
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| style: | ||
| active: false | ||
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| datadog: | ||
| active: true | ||
| excludes: | ||
| - '**/build/**' | ||
| - '**/test/**' | ||
| - '**/testDebug/**' | ||
| - '**/testRelease/**' | ||
| - '**/androidTest/**' | ||
| - '**/testFixtures/**' | ||
| - '**/buildSrc/**' | ||
| - '**/*.kts' | ||
| - '**/instrumented/**' | ||
| - '**/reliability/**' | ||
| - '**/sample/**' | ||
| - '**/tools/**' | ||
| HotMethodIllegalCall: | ||
| active: true | ||
| # Lambda literals passed to functions in `allowedInlineFunctions` are inlined by the compiler | ||
| # and do not allocate — they are excluded from the lambda-allocation check. | ||
| # Add any project-specific `inline` functions here. | ||
| allowedInlineFunctions: | ||
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satween marked this conversation as resolved.
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| # Kotlin scope functions | ||
| - 'let' | ||
| - 'also' | ||
| - 'apply' | ||
| - 'run' | ||
| - 'with' | ||
| - 'takeIf' | ||
| - 'takeUnless' | ||
| # Standard utilities | ||
| - 'synchronized' | ||
| - 'use' | ||
| - 'repeat' | ||
| - 'measureNanoTime' | ||
| - 'measureTimeMillis' | ||
| # Kotlin stdlib collection operations — ALL are inline, lambdas are not allocated | ||
| - 'filter' | ||
| - 'filterNot' | ||
| - 'filterIsInstance' | ||
| - 'filterNotNull' | ||
| - 'map' | ||
| - 'mapNotNull' | ||
| - 'mapIndexed' | ||
| - 'flatMap' | ||
| - 'flatten' | ||
| - 'forEach' | ||
| - 'forEachIndexed' | ||
| - 'any' | ||
| - 'all' | ||
| - 'none' | ||
| - 'count' | ||
| - 'find' | ||
| - 'findLast' | ||
| - 'first' | ||
| - 'firstOrNull' | ||
| - 'last' | ||
| - 'lastOrNull' | ||
| - 'single' | ||
| - 'singleOrNull' | ||
| - 'reduce' | ||
| - 'fold' | ||
| - 'foldIndexed' | ||
| - 'sumOf' | ||
| - 'maxByOrNull' | ||
| - 'minByOrNull' | ||
| - 'maxOrNull' | ||
| - 'minOrNull' | ||
| - 'groupBy' | ||
| - 'associate' | ||
| - 'associateBy' | ||
| - 'partition' | ||
| - 'sortedBy' | ||
| - 'sortedWith' | ||
| - 'sorted' | ||
| - 'toList' | ||
| - 'toMutableList' | ||
| - 'toSet' | ||
| - 'toMutableSet' | ||
| - 'toMap' | ||
| # Builder functions — inline, so the lambda body is inlined (the builder itself still allocates) | ||
| - 'buildString' | ||
| - 'buildList' | ||
| - 'buildSet' | ||
| - 'buildMap' | ||
| # Both lists use `ContainerFQN.method` format (or `SimpleClass.method` as a suffix match). | ||
| # For top-level factory functions the container is the package (e.g. kotlin.collections). | ||
| # emptyList/emptySet/emptyMap are intentionally excluded — they return cached singletons. | ||
| forbiddenFactoryFunctions: | ||
|
There was a problem hiding this comment.
The factory list omits lower-case array factories like Useful? React with 👍 / 👎. |
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| - 'kotlin.collections.listOf' | ||
| - 'kotlin.collections.mutableListOf' | ||
| - 'kotlin.collections.arrayListOf' | ||
| - 'kotlin.collections.setOf' | ||
| - 'kotlin.collections.mutableSetOf' | ||
| - 'kotlin.collections.hashSetOf' | ||
| - 'kotlin.collections.linkedSetOf' | ||
| - 'kotlin.collections.mapOf' | ||
| - 'kotlin.collections.mutableMapOf' | ||
| - 'kotlin.collections.hashMapOf' | ||
| - 'kotlin.collections.linkedMapOf' | ||
| - 'kotlin.collections.buildList' | ||
| - 'kotlin.collections.buildSet' | ||
| - 'kotlin.collections.buildMap' | ||
| - 'kotlin.text.buildString' | ||
| forbiddenCalls: | ||
| # Linear search | ||
| - 'kotlin.collections.List.find' | ||
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There was a problem hiding this comment.
With the current List-only entries, a hot method using a Useful? React with 👍 / 👎. |
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| - 'kotlin.collections.List.findLast' | ||
| - 'kotlin.collections.List.first' | ||
| - 'kotlin.collections.List.firstOrNull' | ||
| - 'kotlin.collections.List.last' | ||
| - 'kotlin.collections.List.lastOrNull' | ||
| - 'kotlin.collections.List.single' | ||
| - 'kotlin.collections.List.singleOrNull' | ||
| - 'kotlin.collections.List.indexOf' | ||
| - 'kotlin.collections.List.indexOfFirst' | ||
| - 'kotlin.collections.List.indexOfLast' | ||
| - 'kotlin.collections.List.lastIndexOf' | ||
| - 'kotlin.collections.List.any' | ||
| - 'kotlin.collections.List.all' | ||
| - 'kotlin.collections.List.none' | ||
| - 'kotlin.collections.List.count' | ||
| # Full iteration — allocates an iterator each call | ||
| - 'kotlin.collections.List.forEach' | ||
| - 'kotlin.collections.List.forEachIndexed' | ||
| - 'kotlin.collections.List.reduce' | ||
| - 'kotlin.collections.List.fold' | ||
| - 'kotlin.collections.List.foldIndexed' | ||
| - 'kotlin.collections.List.sumOf' | ||
| - 'kotlin.collections.List.maxOrNull' | ||
| - 'kotlin.collections.List.minOrNull' | ||
| - 'kotlin.collections.List.maxByOrNull' | ||
| - 'kotlin.collections.List.minByOrNull' | ||
| # Materialising — allocates a new collection each call | ||
| - 'kotlin.collections.List.filter' | ||
| - 'kotlin.collections.List.filterNot' | ||
| - 'kotlin.collections.List.filterIsInstance' | ||
| - 'kotlin.collections.List.filterNotNull' | ||
| - 'kotlin.collections.List.map' | ||
| - 'kotlin.collections.List.mapNotNull' | ||
| - 'kotlin.collections.List.mapIndexed' | ||
| - 'kotlin.collections.List.flatMap' | ||
| - 'kotlin.collections.List.flatten' | ||
| - 'kotlin.collections.List.toList' | ||
| - 'kotlin.collections.List.toMutableList' | ||
| - 'kotlin.collections.List.toSet' | ||
| - 'kotlin.collections.List.toMutableSet' | ||
| - 'kotlin.collections.List.toMap' | ||
| - 'kotlin.collections.List.groupBy' | ||
| - 'kotlin.collections.List.associate' | ||
| - 'kotlin.collections.List.associateBy' | ||
| - 'kotlin.collections.List.partition' | ||
| # Sorting — O(N log N) | ||
| - 'kotlin.collections.List.sorted' | ||
| - 'kotlin.collections.List.sortedBy' | ||
| - 'kotlin.collections.List.sortedWith' | ||
| datadog-test-pyramid: | ||
| active: false | ||
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