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Update settings.gradle.kts to include the benchmark module: add :benchmark to the project structure for enhanced performance testing capabilities.
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‎benchmark/build.gradle.kts‎

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plugins {
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kotlin("jvm") version "2.0.21"
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id("me.champeau.jmh") version "0.7.2"
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}
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jmh {
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warmupIterations.set(2)
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iterations.set(5)
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fork.set(1)
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timeOnIteration.set("1s")
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benchmarkMode.set(listOf("avgt"))
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timeUnit.set("ms")
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resultFormat.set("JSON")
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}
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kotlin {
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jvmToolchain(17)
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}

‎benchmark/src/jmh/kotlin/dev/vyp/stringcare/benchmark/EndToEndBenchmark.kt‎

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package dev.vyp.stringcare.benchmark
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import org.openjdk.jmh.annotations.Benchmark
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import org.openjdk.jmh.annotations.Param
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import org.openjdk.jmh.annotations.Scope
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import org.openjdk.jmh.annotations.Setup
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import org.openjdk.jmh.annotations.State
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import java.util.Base64
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@State(Scope.Benchmark)
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open class EndToEndBenchmark {
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@Param("100", "1000")
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var sampleSize: Int = 100
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private lateinit var sample: List<String>
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private val encoder = Base64.getEncoder()
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private val decoder = Base64.getDecoder()
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@Setup
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fun setup() {
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sample =
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List(sampleSize) { index ->
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"String value #$index"
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}
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}
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@Benchmark
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fun obfuscateAndRevealBatch(): Int {
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val obfuscated = sample.map { encoder.encodeToString(it.toByteArray()) }
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val revealed = obfuscated.map { String(decoder.decode(it)) }
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return revealed.count { it.startsWith("String value #") }
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}
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}

‎benchmark/src/jmh/kotlin/dev/vyp/stringcare/benchmark/FileScanningBenchmark.kt‎

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package dev.vyp.stringcare.benchmark
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import org.openjdk.jmh.annotations.Benchmark
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import org.openjdk.jmh.annotations.Level
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import org.openjdk.jmh.annotations.Param
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import org.openjdk.jmh.annotations.Scope
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import org.openjdk.jmh.annotations.Setup
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import org.openjdk.jmh.annotations.State
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import java.io.File
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import java.nio.file.Files
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import kotlin.io.path.extension
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import kotlin.io.path.name
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import kotlin.io.path.pathString
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@State(Scope.Benchmark)
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open class FileScanningBenchmark {
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@Param("100", "1000", "10000")
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var totalFiles: Int = 100
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private lateinit var projectRoot: File
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@Setup(Level.Trial)
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fun setup() {
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projectRoot = Files.createTempDirectory("scan-benchmark-").toFile()
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createFixtureTree(projectRoot, totalFiles)
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}
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@Benchmark
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fun locateResources(): Int =
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projectRoot
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.toPath()
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.toFile()
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.walkTopDown()
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.count { file ->
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file.isFile && file.name == "strings.xml" &&
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!file.toPath().pathString.contains("/build/") &&
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!file.toPath().pathString.contains("/.gradle/")
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}
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@Benchmark
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fun locateAssets(): Int =
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projectRoot
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.toPath()
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.toFile()
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.walkTopDown()
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.count { file ->
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file.isFile && file.toPath().name == "payload.bin" && file.toPath().extension == "bin"
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}
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private fun createFixtureTree(root: File, files: Int) {
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val module = File(root, "app/src/main")
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val resources = File(module, "res")
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val assets = File(module, "assets")
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resources.mkdirs()
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assets.mkdirs()
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val perType = files / 2
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repeat(perType) { idx ->
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val valuesDir = File(resources, "values-$idx")
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valuesDir.mkdirs()
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File(valuesDir, "strings.xml").writeText(
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"""
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<resources>
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<string name="v_$idx" hidden="true">value_$idx</string>
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</resources>
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""".trimIndent(),
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)
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}
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repeat(files - perType) { idx ->
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val nested = File(assets, "folder-$idx")
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nested.mkdirs()
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File(nested, "payload.bin").writeBytes(byteArrayOf(1, 2, 3, 4))
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}
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}
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}

‎benchmark/src/jmh/kotlin/dev/vyp/stringcare/benchmark/XmlParsingBenchmark.kt‎

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package dev.vyp.stringcare.benchmark
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import org.openjdk.jmh.annotations.Benchmark
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import org.openjdk.jmh.annotations.Level
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import org.openjdk.jmh.annotations.Param
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import org.openjdk.jmh.annotations.Scope
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import org.openjdk.jmh.annotations.Setup
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import org.openjdk.jmh.annotations.State
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import java.io.File
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import java.nio.file.Files
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import javax.xml.parsers.SAXParserFactory
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import kotlin.random.Random
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import org.xml.sax.Attributes
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import org.xml.sax.helpers.DefaultHandler
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@State(Scope.Benchmark)
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open class XmlParsingBenchmark {
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@Param("10", "100", "1000")
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var stringCount: Int = 10
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private lateinit var xmlFile: File
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@Setup(Level.Trial)
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fun setup() {
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xmlFile = Files.createTempFile("strings-", ".xml").toFile()
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xmlFile.writeText(buildXml(stringCount))
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}
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@Benchmark
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fun parseStringsXml(): Int {
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var matched = 0
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val parser = SAXParserFactory.newInstance().newSAXParser()
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parser.parse(
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xmlFile,
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object : DefaultHandler() {
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override fun startElement(
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uri: String?,
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localName: String?,
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qName: String?,
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attributes: Attributes?,
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) {
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if (qName == "string" && attributes?.getValue("hidden") == "true") {
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matched += 1
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}
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}
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},
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)
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return matched
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}
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private fun buildXml(items: Int): String {
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val payload =
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buildString {
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append("<resources>\n")
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repeat(items) { index ->
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val value = Random.nextInt(1_000_000, 9_999_999)
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append(""" <string name="k_$index" hidden="true">value_$value</string>""")
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append('\n')
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}
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append("</resources>\n")
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}
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return payload
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}
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}

‎settings.gradle.kts‎

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}
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rootProject.name = "stringcare-android"
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include(":app", ":library")
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include(":app", ":library", ":benchmark")

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