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32 lines
1.0 KiB
32 lines
1.0 KiB
4 years ago
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/*
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* Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
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*/
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// This file was automatically generated from channels.md by Knit tool. Do not edit.
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package kotlinx.coroutines.guide.exampleChannel04
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import kotlinx.coroutines.*
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import kotlinx.coroutines.channels.ReceiveChannel
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import kotlinx.coroutines.channels.produce
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fun main() = runBlocking {
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val numbers = produceNumbers() // produces integers from 1 and on
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val squares = square(numbers) // squares integers
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repeat(5) {
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delay(1000)
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println(squares.receive()) // print first five
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}
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println("Done!") // we are done
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coroutineContext.cancelChildren() // cancel children coroutines
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}
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@OptIn(ExperimentalCoroutinesApi::class)
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fun CoroutineScope.produceNumbers() = produce<Int> {
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var x = 1
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while (true) send(x++) // infinite stream of integers starting from 1
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}
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@OptIn(ExperimentalCoroutinesApi::class)
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fun CoroutineScope.square(numbers: ReceiveChannel<Int>): ReceiveChannel<Int> = produce {
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for (x in numbers) send(x * x)
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}
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