BAEL-867 coroutines tests (#2011)
* BAEL-867 coroutines tests * BAEL-867 add two channels examples * BAEL-867 fix example * BAEL-867 remove channels * BAEL-867 optimize imports * BAEL-867 remove kotlin module
This commit is contained in:
Tomasz Lelek
Grzegorz Piwowarek
parent
df782e425b
commit
69c330eb6c
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@ -13,6 +13,15 @@
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<repositories>
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<repository>
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<id>central</id>
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<url>http://jcenter.bintray.com</url>
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</repository>
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</repositories>
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<dependencies>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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@ -31,6 +40,11 @@
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<version>${kotlin-reflect.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlinx</groupId>
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<artifactId>kotlinx-coroutines-core</artifactId>
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<version>${kotlinx.version}</version>
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</dependency>
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</dependencies>
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@ -104,10 +118,11 @@
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</build>
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<properties>
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<kotlin-maven-plugin.version>1.1.1</kotlin-maven-plugin.version>
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<kotlin-test-junit.version>1.1.1</kotlin-test-junit.version>
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<kotlin-stdlib.version>1.1.1</kotlin-stdlib.version>
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<kotlin-reflect.version>1.1.1</kotlin-reflect.version>
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<kotlin-maven-plugin.version>1.1.2</kotlin-maven-plugin.version>
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<kotlin-test-junit.version>1.1.2</kotlin-test-junit.version>
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<kotlin-stdlib.version>1.1.2</kotlin-stdlib.version>
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<kotlin-reflect.version>1.1.2</kotlin-reflect.version>
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<kotlinx.version>0.15</kotlinx.version>
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</properties>
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</project>
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@ -0,0 +1,179 @@
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package com.baeldung.kotlin
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import kotlinx.coroutines.experimental.*
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import org.junit.Test
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import java.util.concurrent.atomic.AtomicInteger
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import kotlin.coroutines.experimental.buildSequence
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import kotlin.system.measureTimeMillis
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import kotlin.test.assertEquals
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import kotlin.test.assertTrue
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class CoroutinesTest {
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@Test
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fun givenBuildSequence_whenTakeNElements_thenShouldReturnItInALazyWay() {
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//given
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val fibonacciSeq = buildSequence {
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var a = 0
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var b = 1
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yield(1)
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while (true) {
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yield(a + b)
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val tmp = a + b
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a = b
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b = tmp
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}
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}
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//when
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val res = fibonacciSeq.take(5).toList()
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//then
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assertEquals(res, listOf(1, 1, 2, 3, 5))
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}
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@Test
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fun givenLazySeq_whenTakeNElements_thenShouldReturnAllElements() {
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//given
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val lazySeq = buildSequence {
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print("START ")
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for (i in 1..5) {
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yield(i)
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print("STEP ")
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}
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print("END")
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}
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//when
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val res = lazySeq.take(10).toList()
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//then
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assertEquals(res, listOf(1, 2, 3, 4, 5))
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}
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@Test
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fun givenAsyncCoroutine_whenStartIt_thenShouldExecuteItInTheAsyncWay() {
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//given
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val res = mutableListOf<String>()
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//when
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runBlocking<Unit> {
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val promise = launch(CommonPool) { expensiveComputation(res) }
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res.add("Hello,")
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promise.join()
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}
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//then
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assertEquals(res, listOf("Hello,", "word!"))
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}
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suspend fun expensiveComputation(res: MutableList<String>) {
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delay(1000L)
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res.add("word!")
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}
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@Test
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fun givenHugeAmountOfCoroutines_whenStartIt_thenShouldExecuteItWithoutOutOfMemory() {
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runBlocking<Unit> {
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//given
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val counter = AtomicInteger(0)
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val numberOfCoroutines = 100_000
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//when
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val jobs = List(numberOfCoroutines) {
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launch(CommonPool) {
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delay(1L)
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counter.incrementAndGet()
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}
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}
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jobs.forEach { it.join() }
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//then
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assertEquals(counter.get(), numberOfCoroutines)
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}
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}
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@Test
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fun givenCancellableJob_whenRequestForCancel_thenShouldQuit() {
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runBlocking<Unit> {
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//given
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val job = launch(CommonPool) {
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while (isActive) {
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println("is working")
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}
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}
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delay(1300L)
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//when
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job.cancel()
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//then cancel successfully
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}
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}
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@Test(expected = CancellationException::class)
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fun givenAsyncAction_whenDeclareTimeout_thenShouldFinishWhenTimedOut() {
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runBlocking<Unit> {
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withTimeout(1300L) {
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repeat(1000) { i ->
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println("Some expensive computation $i ...")
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delay(500L)
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}
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}
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}
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}
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@Test
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fun givenHaveTwoExpensiveAction_whenExecuteThemAsync_thenTheyShouldRunConcurrently() {
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runBlocking<Unit> {
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val delay = 1000L
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val time = measureTimeMillis {
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//given
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val one = async(CommonPool) { someExpensiveComputation(delay) }
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val two = async(CommonPool) { someExpensiveComputation(delay) }
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//when
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runBlocking {
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one.await()
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two.await()
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}
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}
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//then
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assertTrue(time < delay * 2)
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}
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}
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@Test
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fun givenTwoExpensiveAction_whenExecuteThemLazy_thenTheyShouldNotConcurrently() {
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runBlocking<Unit> {
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val delay = 1000L
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val time = measureTimeMillis {
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//given
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val one = async(CommonPool, CoroutineStart.LAZY) { someExpensiveComputation(delay) }
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val two = async(CommonPool, CoroutineStart.LAZY) { someExpensiveComputation(delay) }
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//when
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runBlocking {
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one.await()
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two.await()
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}
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}
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//then
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assertTrue(time > delay * 2)
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}
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}
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suspend fun someExpensiveComputation(delayInMilliseconds: Long) {
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delay(delayInMilliseconds)
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}
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}
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