kotlinx-coroutines-core/jvm/test/guide/example-context-10.kt

/*
 * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

// This file was automatically generated from coroutines-guide.md by Knit tool. Do not edit.
package kotlinx.coroutines.guide.context10

import kotlin.coroutines.*
import kotlinx.coroutines.*

class Activity : CoroutineScope by CoroutineScope(Dispatchers.Default) {

    fun destroy() {
        cancel() // Extension on CoroutineScope
    }
    // to be continued ...

    // class Activity continues
    fun doSomething() {
        // launch ten coroutines for a demo, each working for a different time
        repeat(10) { i ->
            launch {
                delay((i + 1) * 200L) // variable delay 200ms, 400ms, ... etc
                println("Coroutine $i is done")
            }
        }
    }
} // class Activity ends

fun main() = runBlocking<Unit> {
    val activity = Activity()
    activity.doSomething() // run test function
    println("Launched coroutines")
    delay(500L) // delay for half a second
    println("Destroying activity!")
    activity.destroy() // cancels all coroutines
    delay(1000) // visually confirm that they don't work
}