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example-select-01.kt
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example-select-01.kt
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/*
* Copyright 2016-2017 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http:https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// This file was automatically generated from coroutines-guide.md by Knit tool. Do not edit.
package guide.select.example01
import kotlinx.coroutines.experimental.*
import kotlinx.coroutines.experimental.channels.*
import kotlinx.coroutines.experimental.selects.*
import kotlin.coroutines.experimental.CoroutineContext
fun fizz(context: CoroutineContext) = produce<String>(context) {
while (true) { // sends "Fizz" every 300 ms
delay(300)
send("Fizz")
}
}
fun buzz(context: CoroutineContext) = produce<String>(context) {
while (true) { // sends "Buzz!" every 500 ms
delay(500)
send("Buzz!")
}
}
suspend fun selectFizzBuzz(fizz: ReceiveChannel<String>, buzz: ReceiveChannel<String>) {
select<Unit> { // <Unit> means that this select expression does not produce any result
fizz.onReceive { value -> // this is the first select clause
println("fizz -> '$value'")
}
buzz.onReceive { value -> // this is the second select clause
println("buzz -> '$value'")
}
}
}
fun main(args: Array<String>) = runBlocking<Unit> {
val fizz = fizz(coroutineContext)
val buzz = buzz(coroutineContext)
repeat(7) {
selectFizzBuzz(fizz, buzz)
}
coroutineContext.cancelChildren() // cancel fizz & buzz coroutines
}