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Find expensive allocations on hot paths

Recipe IDorg.openrewrite.kotlin.performance.FindAllocationsInHotPaths$KtRecipe

Artifactio.moderne.recipe:recipes-kotlin

Search-only recipes that flag heavyweight allocations sitting on a path the runtime exercises repeatedly — inside a loop, inside View.onDraw/onMeasure/onLayout. Each match shows up as a SearchResult for review; nothing is rewritten automatically.

Composite recipeKotlinModerne Proprietary License

Try in PlatformTry this recipe in the Moderne platform. Not a user yet? You’ll get a no-setup demo environment, with nothing to install or configure.

Definition

Recipes24

24 recipes

• Find Regex allocations inside loops
• Find Pattern.compile allocations inside loops
• Find SimpleDateFormat allocations inside loops
• Find DateTimeFormatter.ofPattern allocations inside loops
• Find BigDecimal("...") allocations inside loops
• Find BigInteger("...") allocations inside loops
• Find BigInteger.valueOf(long) calls inside loops
• Find Calendar.getInstance() calls inside loops
• Find Locale(...) allocations inside loops
• Find File(...).bufferedReader() calls inside loops
• Find URL("...") allocations inside loops
• Find URI("...") allocations inside loops
• Find Base64.getDecoder() calls inside loops
• Find Charset.forName(...) calls inside loops
• Find Optional.get() calls inside loops
• Find LoggerFactory.getLogger calls inside loops
• Find Class.forName calls inside loops
• Find String.format calls inside loops
• Find MessageDigest.getInstance calls inside loops
• Find Jackson ObjectMapper() allocations inside loops
• Find Gson() allocations inside loops
• Find graphics allocations inside View.onDraw
• Find graphics allocations inside View.onMeasure
• Find graphics allocations inside View.onLayout

Usage

Run this recipe

This recipe has no required configuration options. Users of Moderne can run it via the Moderne CLI.

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell

mod run . --recipe FindAllocationsInHotPaths$KtRecipe

If the recipe is not available locally, then you can install it using:

mod config recipes jar install io.moderne.recipe:recipes-kotlin:0.1.3

Data tables

Source files that had results

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column	Description
Source path before the run	The source path of the file before the run. null when a source file was created during the run.
Source path after the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changes	In a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changes	The specific recipe that made a change.
Estimated time saving	An estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
Cycle	The recipe cycle in which the change was made.

Source files that had search results

org.openrewrite.table.SearchResults

Search results that were found during the recipe run.

Column	Description
Source path of search result before the run	The source path of the file with the search result markers present.
Source path of search result after run the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Result	The trimmed printed tree of the LST element that the marker is attached to.
Description	The content of the description of the marker.
Recipe that added the search marker	The specific recipe that added the Search marker.

Source files that errored on a recipe

org.openrewrite.table.SourcesFileErrors

The details of all errors produced by a recipe run.

Column	Description
Source path	The file that failed to parse.
Recipe that made changes	The specific recipe that made a change.
Stack trace	The stack trace of the failure.

Recipe performance

org.openrewrite.table.RecipeRunStats

Statistics used in analyzing the performance of recipes.

Column	Description
The recipe	The recipe whose stats are being measured both individually and cumulatively.
Source file count	The number of source files the recipe ran over.
Source file changed count	The number of source files which were changed in the recipe run. Includes files created, deleted, and edited.
Cumulative scanning time (ns)	The total time spent across the scanning phase of this recipe.
Max scanning time (ns)	The max time scanning any one source file.
Cumulative edit time (ns)	The total time spent across the editing phase of this recipe.
Max edit time (ns)	The max time editing any one source file.