Coverage Summary for Class: VThread (dev.suresh.lang)

 package dev.suresh.lang
 
 import dev.suresh.*
 import io.github.oshai.kotlinlogging.KLogger
 import java.util.concurrent.StructuredTaskScope
 import java.util.stream.Gatherers
 import kotlin.metadata.jvm.KotlinClassMetadata
 import kotlin.time.Duration.Companion.seconds
 import kotlinx.datetime.Clock
 import kotlinx.datetime.LocalDateTime
 import kotlinx.datetime.toJavaInstant
 import langFeatures
 import stdlibFeatures
 
 object VThread {
 
   context(KLogger)
   suspend fun virtualThreads() = runOnVirtualThread {
     info { (Greeting().greeting()) }
     listOf("main", "jvm", "js", "wasm").forEach {
       info { "Common-$it  --> ${ClassLoader.getSystemResource("common-$it-res.txt")?.readText()}" }
       info { "Backend-$it --> ${ClassLoader.getSystemResource("backend-$it-res.txt")?.readText()}" }
     }
 
     structuredConcurrency()
     langFeatures()
     stdlibFeatures()
     kotlinxMetaData()
     classFileApi()
     info { "Concurrent Gatherers: ${gatherers().size}" }
   }
 
   context(KLogger)
   private fun structuredConcurrency() {
     info { "Structured concurrency..." }
     val taskList =
         StructuredTaskScope<String>().use { sts ->
           val start = Clock.System.now()
           val tasks =
               (1..100).map {
                 sts.fork {
                   when (it) {
                     in 1..40 -> "Task $it"
                     in 41..60 -> kotlin.error("Error in task $it")
                     else -> {
                       while (!Thread.currentThread().isInterrupted) {
                         debug { "Task $it ..." }
                         Thread.sleep(100)
                       }
                       "Task $it"
                     }
                   }
                 }
               }
           runCatching { sts.joinUntil(start.plus(1.seconds).toJavaInstant()) }
           tasks
         }
 
     info { "Total Tasks: ${taskList.size}" }
     val states = taskList.groupBy { it.state() }
     states.forEach { (t, u) -> info { "$t --> ${u.size}" } }
     check(states[StructuredTaskScope.Subtask.State.SUCCESS]?.size == 40)
     check(states[StructuredTaskScope.Subtask.State.FAILED]?.size == 20)
     check(states[StructuredTaskScope.Subtask.State.UNAVAILABLE]?.size == 40)
 
     StructuredTaskScope.ShutdownOnFailure().use {
       val task = it.fork { "Virtual thread on ${Lang("Kotlin")} ${platform.name}!" }
       it.join().throwIfFailed()
       info { task.get() }
     }
   }
 
   private fun gatherers(): List<String> {
     val mapGatherer = Gatherers.mapConcurrent<Int, String>(10) { "$it-concurrent" }
     return (1..100).toList().stream().gather(mapGatherer).toList()
   }
 
   context(KLogger)
   private fun kotlinxMetaData() {
     val metadataAnnotation = LocalDateTime::class.java.getAnnotation(Metadata::class.java)
     when (val metadata = KotlinClassMetadata.readLenient(metadataAnnotation)) {
       is KotlinClassMetadata.Class -> {
         val klass = metadata.kmClass
         info { klass.functions.map { it.name } }
         info { klass.properties.map { it.name } }
       }
       is KotlinClassMetadata.Unknown -> log.info { "Unknown" }
       else -> info { "Other" }
     }
   }
 }
 
 fun classFileApi() {
   //  val codeModel =
   //      Classfile.of()
   //          .parse(Class.forName("AppKt").toBytes())
   //          .methods()
   //          .filter { it.methodName().equalsString("main") }
   //          .firstNotNullOfOrNull { it.code().getOrNull() }
   //  codeModel?.elementList()?.forEach { log.info {it.toString()} }
 }