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BAEL-3817 - Add unit tests showing the difference between the Spring ThreadPoolTaskExecutor's corePoolSize and maxPoolSize properties

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mthomas 2020-02-08 04:51:16 -06:00
parent 63d394d697
commit f7697918f2
4 changed files with 181 additions and 0 deletions
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spring-threads/.gitignore vendored Normal file
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RemoteSystemsTempFiles/
.classpath
.project
.settings/
bin/
.metadata/
docs/*.autosave
.recommenders/
build/
.gradle/
.DS_Store
.idea/

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spring-threads/README.md Normal file
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## Spring Threads
This module contains articles about threading using threads, specifically Spring's ThreadPoolTaskExecutor
### Relevant Articles:
- [Introduction to Thread Pools in Java](https://www.baeldung.com/thread-pool-java-and-guava)
- [How To Do @Async in Spring](https://www.baeldung.com/spring-async)
- [A Guide to the Spring Task Scheduler](https://www.baeldung.com/spring-task-scheduler)
- [A Guide to the Java ExecutorService](https://www.baeldung.com/java-executor-service-tutorial)

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spring-threads/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-threads</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-threads</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-spring-5</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-spring-5</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
<properties>
<assertj.version>3.12.2</assertj.version>
</properties>
</project>

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spring-threads/src/test/java/com/baeldung/threading/ThreadPoolTaskExecutorUnitTest.java Normal file
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package com.baeldung.threading;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ThreadLocalRandom;
import org.junit.Assert;
import org.junit.Test;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
public class ThreadPoolTaskExecutorUnitTest {
@Test
public void whenUsingDefaults_thenSingleThread() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.afterPropertiesSet();
CountDownLatch countDownLatch = new CountDownLatch(10);
for (int i = 0; i < 10; i++) {
taskExecutor.execute(() -> {
try {
Thread.sleep(10L * ThreadLocalRandom.current().nextLong(1, 10));
countDownLatch.countDown();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
});
}
while (countDownLatch.getCount() > 0) {
Assert.assertEquals(1, taskExecutor.getPoolSize());
}
}
@Test
public void whenCorePoolSizeFive_thenFiveThreads() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.afterPropertiesSet();
CountDownLatch countDownLatch = new CountDownLatch(10);
for (int i = 0; i < 10; i++) {
taskExecutor.execute(() -> {
try {
Thread.sleep(100L * ThreadLocalRandom.current().nextLong(1, 10));
countDownLatch.countDown();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
});
}
while (countDownLatch.getCount() > 0) {
Assert.assertEquals(5, taskExecutor.getPoolSize());
}
}
@Test
public void whenCorePoolSizeFive_andMaxPoolSizeTen_thenFiveThreads() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.setMaxPoolSize(10);
taskExecutor.afterPropertiesSet();
CountDownLatch countDownLatch = new CountDownLatch(10);
for (int i = 0; i < 10; i++) {
taskExecutor.execute(() -> {
try {
Thread.sleep(100L * ThreadLocalRandom.current().nextLong(1, 10));
countDownLatch.countDown();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
});
}
while (countDownLatch.getCount() > 0) {
Assert.assertEquals(5, taskExecutor.getPoolSize());
}
}
@Test
public void whenCorePoolSizeFive_andMaxPoolSizeTen_andQueueCapacityZero_thenTenThreads() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.setMaxPoolSize(10);
taskExecutor.setQueueCapacity(0);
taskExecutor.afterPropertiesSet();
CountDownLatch countDownLatch = new CountDownLatch(10);
for (int i = 0; i < 10; i++) {
taskExecutor.execute(() -> {
try {
Thread.sleep(100L * ThreadLocalRandom.current().nextLong(1, 10));
countDownLatch.countDown();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
});
}
while (countDownLatch.getCount() > 0) {
Assert.assertEquals(10, taskExecutor.getPoolSize());
}
}
@Test
public void whenCorePoolSizeFive_andMaxPoolSizeTen_andQueueCapacityTen_thenTenThreads() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.setMaxPoolSize(10);
taskExecutor.setQueueCapacity(10);
taskExecutor.afterPropertiesSet();
CountDownLatch countDownLatch = new CountDownLatch(10);
for (int i = 0; i < 20; i++) {
taskExecutor.execute(() -> {
try {
Thread.sleep(100L * ThreadLocalRandom.current().nextLong(1, 10));
countDownLatch.countDown();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
});
}
while (countDownLatch.getCount() > 0) {
Assert.assertEquals(10, taskExecutor.getPoolSize());
}
}
}