example-reactive-operators-04.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-reactive.md by Knit tool. Do not edit.
package kotlinx.coroutines.rx2.guide.operators04

import kotlinx.coroutines.*
import kotlinx.coroutines.reactive.*
import org.reactivestreams.*
import kotlin.coroutines.*

fun <T> Publisher<Publisher<T>>.merge(context: CoroutineContext) = publish<T>(context) {
  collect { pub -> // for each publisher collected
      launch {  // launch a child coroutine
          pub.collect { send(it) } // resend all element from this publisher
      }
  }
}

fun CoroutineScope.rangeWithInterval(time: Long, start: Int, count: Int) = publish<Int> {
    for (x in start until start + count) { 
        delay(time) // wait before sending each number
        send(x)
    }
}

fun CoroutineScope.testPub() = publish<Publisher<Int>> {
    send(rangeWithInterval(250, 1, 4)) // number 1 at 250ms, 2 at 500ms, 3 at 750ms, 4 at 1000ms 
    delay(100) // wait for 100 ms
    send(rangeWithInterval(500, 11, 3)) // number 11 at 600ms, 12 at 1100ms, 13 at 1600ms
    delay(1100) // wait for 1.1s - done in 1.2 sec after start
}

fun main() = runBlocking<Unit> {
    testPub().merge(Dispatchers.Unconfined).collect { println(it) } // print the whole stream
}