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package com.pitchedapps.frost.rx
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.async
import kotlinx.coroutines.runBlocking
import org.junit.Rule
import org.junit.rules.Timeout
import java.util.concurrent.atomic.AtomicInteger
import kotlin.test.BeforeTest
import kotlin.test.Test
import kotlin.test.assertEquals
import kotlin.test.assertTrue
import kotlin.test.fail
class FlyweightTest {
@get:Rule
val globalTimeout: Timeout = Timeout.seconds(5)
lateinit var flyweight: Flyweight<Int, Int>
lateinit var callCount: AtomicInteger
private val LONG_RUNNING_KEY = -78
@BeforeTest
fun before() {
callCount = AtomicInteger(0)
flyweight = Flyweight(GlobalScope, 100, 200L) {
callCount.incrementAndGet()
when (it) {
LONG_RUNNING_KEY -> Thread.sleep(100000)
else -> Thread.sleep(100)
}
it * 2
}
}
@Test
fun basic() {
assertEquals(2, runBlocking { flyweight.fetch(1) }, "Invalid result")
assertEquals(1, callCount.get(), "1 call expected")
}
@Test
fun multipleWithOneKey() {
val results: List<Int> = runBlocking {
(0..1000).map {
flyweight.scope.async {
flyweight.fetch(1)
}
}.map { it.await() }
}
assertEquals(1, callCount.get(), "1 call expected")
assertEquals(1001, results.size, "Incorrect number of results returned")
assertTrue(results.all { it == 2 }, "Result should all be 2")
}
@Test
fun consecutiveReuse() {
runBlocking {
flyweight.fetch(1)
assertEquals(1, callCount.get(), "1 call expected")
flyweight.fetch(1)
assertEquals(1, callCount.get(), "Reuse expected")
Thread.sleep(300)
flyweight.fetch(1)
assertEquals(2, callCount.get(), "Refetch expected")
}
}
@Test
fun invalidate() {
runBlocking {
flyweight.fetch(1)
assertEquals(1, callCount.get(), "1 call expected")
flyweight.invalidate(1)
flyweight.fetch(1)
assertEquals(2, callCount.get(), "New call expected")
}
}
@Test
fun destroy() {
runBlocking {
val longRunningResult = async { flyweight.fetch(LONG_RUNNING_KEY) }
flyweight.fetch(1)
flyweight.cancel()
try {
flyweight.fetch(1)
fail("Flyweight should not be fulfilled after it is destroyed")
} catch (e: Exception) {
assertEquals("Flyweight is not active", e.message, "Incorrect error found on fetch after destruction")
}
try {
longRunningResult.await()
fail("Flyweight should have cancelled previously running requests")
} catch (e: Exception) {
assertEquals(
"Flyweight cancelled",
e.message,
"Incorrect error found on fetch cancelled by destruction"
)
}
println("Done")
}
}
}
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