Created
December 30, 2019 19:02
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import kotlinx.coroutines.CoroutineScope | |
import kotlinx.coroutines.SupervisorJob | |
import kotlinx.coroutines.asCoroutineDispatcher | |
import kotlinx.coroutines.channels.awaitClose | |
import kotlinx.coroutines.delay | |
import kotlinx.coroutines.flow.Flow | |
import kotlinx.coroutines.flow.channelFlow | |
import kotlinx.coroutines.flow.launchIn | |
import kotlinx.coroutines.flow.onEach | |
import kotlinx.coroutines.isActive | |
import kotlinx.coroutines.launch | |
import kotlinx.coroutines.runBlocking | |
import java.util.concurrent.Executors | |
import kotlin.coroutines.CoroutineContext | |
import kotlin.random.Random | |
class TryChannelFlow : CoroutineScope { | |
private val supervisorJob = SupervisorJob() | |
override val coroutineContext: CoroutineContext | |
get() = Executors.newFixedThreadPool(3).asCoroutineDispatcher() | |
private val scope = CoroutineScope(supervisorJob + coroutineContext) | |
fun start() { | |
val data: Flow<Int> = DataProvider().generateData() | |
data.onEach{ | |
println("received -->$it") | |
}.launchIn(scope) | |
} | |
fun stop() { | |
supervisorJob.cancel() | |
} | |
} | |
class DataProvider { | |
fun generateData(): Flow<Int> { | |
return channelFlow { | |
val job = launch { | |
while (isActive) { | |
println("sending on ${Thread.currentThread().name}") | |
channel.send(Random.nextInt(1000)) // pretend receiving data from non-blocking io | |
delay(100) | |
} | |
} | |
awaitClose { | |
job.cancel() | |
} | |
} | |
} | |
} | |
fun main() = runBlocking { | |
val tryChannelFlow = TryChannelFlow() | |
tryChannelFlow.start() | |
delay(3000) // pretend app crashes/terminated | |
tryChannelFlow.stop() | |
println("completed") | |
} |
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