jvmTest.guide.example-flow-23.kt Maven / Gradle / Ivy

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Coroutines support libraries for Kotlin

There is a newer version: 1.9.0

/*
 * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

// This file was automatically generated from flow.md by Knit tool. Do not edit.
package kotlinx.coroutines.guide.exampleFlow23

import kotlinx.coroutines.*
import kotlinx.coroutines.flow.*

fun requestFlow(i: Int): Flow = flow {
    emit("$i: First") 
    delay(500) // wait 500 ms
    emit("$i: Second")    
}

fun main() = runBlocking { 
    val startTime = currentTimeMillis() // remember the start time 
    (1..3).asFlow().onEach { delay(100) } // a number every 100 ms 
        .flatMapConcat { requestFlow(it) }                                                                           
        .collect { value -> // collect and print 
            println("$value at ${currentTimeMillis() - startTime} ms from start") 
        } 
}