package kotlinx.coroutines.channels

import kotlinx.coroutines.testing.*
import kotlinx.coroutines.*
import org.junit.*
import org.junit.runner.*
import org.junit.runners.*

@RunWith(Parameterized::class)
class BufferedChannelStressTest(private val capacity: Int) : TestBase() {

    companion object {
        @Parameterized.Parameters(name = "{0}, nSenders={1}, nReceivers={2}")
        @JvmStatic
        fun params(): Collection<Array<Any>> = listOf(1, 10, 100, 100_000, 1_000_000).map { arrayOf<Any>(it) }
    }

    @Test
    fun testStress() = runTest {
        val n = 100_000 * stressTestMultiplier
        val q = Channel<Int>(capacity)
        val sender = launch {
            for (i in 1..n) {
                q.send(i)
            }
            expect(2)
        }
        val receiver = launch {
            for (i in 1..n) {
                val next = q.receive()
                check(next == i)
            }
            expect(3)
        }
        expect(1)
        sender.join()
        receiver.join()
        finish(4)
    }

    @Test
    fun testBurst() = runTest {
        Assume.assumeTrue(capacity < 100_000)
        repeat(10_000 * stressTestMultiplier) {
            val channel = Channel<Int>(capacity)
            val sender = launch(Dispatchers.Default) {
                for (i in 1..capacity * 2) {
                    channel.send(i)
                }
            }
            val receiver = launch(Dispatchers.Default) {
                for (i in 1..capacity * 2) {
                    val next = channel.receive()
                    check(next == i)
                }
            }
            sender.join()
            receiver.join()
        }
    }
}