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Adding code for article tracked under BAEL-3573. (#8999) 

Co-authored-by: CHANDRAKANT Kumar <kumar.chandrakant@soprabanking.com>
This commit is contained in:
Kumar Chandrakant 2020-04-02 00:23:38 +05:30 committed by GitHub
parent b56b71cf5f
commit b4610e110f
11 changed files with 385 additions and 0 deletions
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26
core-java-modules/core-java-concurrency-testing/.gitignore vendored Normal file
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*.class
0.*
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
.resourceCache
# Packaged files #
*.jar
*.war
*.ear
# Files generated by integration tests
*.txt
backup-pom.xml
/bin/
/temp
#IntelliJ specific
.idea/
*.iml

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core-java-modules/core-java-concurrency-testing/README.md Normal file
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=========
## Core Java Concurrency Testing Examples
### Relevant Articles:
- [Testing Multi-Threaded Code in Java](https://www.baeldung.com/java-testing-multithreaded)

93
core-java-modules/core-java-concurrency-testing/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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>core-java-concurrency-testing</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-testing</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.googlecode.thread-weaver</groupId>
<artifactId>threadweaver</artifactId>
<version>0.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.code.tempus-fugit</groupId>
<artifactId>tempus-fugit</artifactId>
<version>1.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.googlecode.multithreadedtc</groupId>
<artifactId>multithreadedtc</artifactId>
<version>1.01</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjdk.jcstress</groupId>
<artifactId>jcstress-core</artifactId>
<version>0.5</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<compilerVersion>${javac.target}</compilerVersion>
<source>${javac.target}</source>
<target>${javac.target}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<id>main</id>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<finalName>jcstress</finalName>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jcstress.Main</mainClass>
</transformer>
<transformer
implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/TestList</resource>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

22
core-java-modules/core-java-concurrency-testing/src/main/java/com/baeldung/concurrent/MyCounter.java Normal file
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package com.baeldung.concurrent;
public class MyCounter {
private int count;
public void increment() {
int temp = count;
count = temp + 1;
}
public synchronized void incrementWithWait() throws InterruptedException {
int temp = count;
wait(100);
count = temp + 1;
}
public int getCount() {
return count;
}
}

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core-java-modules/core-java-concurrency-testing/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

36
core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterJCStressUnitTest.java Normal file
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package com.baeldung.concurrent;
import static org.openjdk.jcstress.annotations.Expect.ACCEPTABLE;
import static org.openjdk.jcstress.annotations.Expect.ACCEPTABLE_INTERESTING;
import org.openjdk.jcstress.annotations.Actor;
import org.openjdk.jcstress.annotations.Arbiter;
import org.openjdk.jcstress.annotations.JCStressTest;
import org.openjdk.jcstress.annotations.Outcome;
import org.openjdk.jcstress.annotations.State;
import org.openjdk.jcstress.infra.results.I_Result;
@JCStressTest
@Outcome(id = "1", expect = ACCEPTABLE_INTERESTING, desc = "One update lost.")
@Outcome(id = "2", expect = ACCEPTABLE, desc = "Both updates.")
@State
public class MyCounterJCStressUnitTest {
private MyCounter counter;
@Actor
public void actor1() {
counter.increment();
}
@Actor
public void actor2() {
counter.increment();
}
@Arbiter
public void arbiter(I_Result r) {
r.r1 = counter.getCount();
}
}

35
core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterMultithreadedTCUnitTest.java Normal file
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package com.baeldung.concurrent;
import org.junit.Test;
import edu.umd.cs.mtc.MultithreadedTestCase;
import edu.umd.cs.mtc.TestFramework;
public class MyCounterMultithreadedTCUnitTest extends MultithreadedTestCase {
private MyCounter counter;
@Override
public void initialize() {
counter = new MyCounter();
}
public void thread1() throws InterruptedException {
counter.increment();
}
public void thread2() throws InterruptedException {
counter.increment();
}
@SuppressWarnings("deprecation")
@Override
public void finish() {
assertEquals(2, counter.getCount());
}
@Test
public void testCounter() throws Throwable {
TestFramework.runManyTimes(new MyCounterMultithreadedTCUnitTest(), 1000);
}
}

57
core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterSimpleUnitTest.java Normal file
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package com.baeldung.concurrent;
import static org.junit.Assert.assertEquals;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.junit.Test;
public class MyCounterSimpleUnitTest {
@Test
public void testCounter() {
MyCounter counter = new MyCounter();
for (int i = 0; i < 500; i++)
counter.increment();
assertEquals(500, counter.getCount());
}
// @Test
public void testCounterWithConcurrency() throws InterruptedException {
int numberOfThreads = 100;
ExecutorService service = Executors.newFixedThreadPool(10);
CountDownLatch latch = new CountDownLatch(numberOfThreads);
MyCounter counter = new MyCounter();
for (int i = 0; i < numberOfThreads; i++) {
service.execute(() -> {
counter.increment();
latch.countDown();
});
}
latch.await();
assertEquals(numberOfThreads, counter.getCount());
}
// @Test
public void testSummationWithConcurrencyAndWait() throws InterruptedException {
int numberOfThreads = 2;
ExecutorService service = Executors.newFixedThreadPool(10);
CountDownLatch latch = new CountDownLatch(numberOfThreads);
MyCounter counter = new MyCounter();
for (int i = 0; i < numberOfThreads; i++) {
service.submit(() -> {
try {
counter.incrementWithWait();
} catch (InterruptedException e) {
e.printStackTrace();
}
latch.countDown();
});
}
latch.await();
assertEquals(numberOfThreads, counter.getCount());
}
}

35
core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterTempusFugitUnitTest.java Normal file
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package com.baeldung.concurrent;
import static org.junit.Assert.assertEquals;
import org.junit.AfterClass;
import org.junit.Rule;
import org.junit.Test;
import com.google.code.tempusfugit.concurrency.ConcurrentRule;
import com.google.code.tempusfugit.concurrency.RepeatingRule;
import com.google.code.tempusfugit.concurrency.annotations.Concurrent;
import com.google.code.tempusfugit.concurrency.annotations.Repeating;
public class MyCounterTempusFugitUnitTest {
@Rule
public ConcurrentRule concurrently = new ConcurrentRule();
@Rule
public RepeatingRule rule = new RepeatingRule();
private static MyCounter counter = new MyCounter();
@Test
@Concurrent(count = 2)
@Repeating(repetition = 10)
public void runsMultipleTimes() {
counter.increment();
}
@AfterClass
public static void annotatedTestRunsMultipleTimes() throws InterruptedException {
assertEquals(counter.getCount(), 20);
}
}

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core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterThreadWeaverUnitTest.java Normal file
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package com.baeldung.concurrent;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.google.testing.threadtester.AnnotatedTestRunner;
import com.google.testing.threadtester.ThreadedAfter;
import com.google.testing.threadtester.ThreadedBefore;
import com.google.testing.threadtester.ThreadedMain;
import com.google.testing.threadtester.ThreadedSecondary;
public class MyCounterThreadWeaverUnitTest {
private MyCounter counter;
@ThreadedBefore
public void before() {
counter = new MyCounter();
}
@ThreadedMain
public void mainThread() {
counter.increment();
}
@ThreadedSecondary
public void secondThread() {
counter.increment();
}
@ThreadedAfter
public void after() {
assertEquals(2, counter.getCount());
}
@Test
public void testCounter() {
new AnnotatedTestRunner().runTests(this.getClass(), MyCounter.class);
}
}

13
core-java-modules/core-java-concurrency-testing/src/test/resources/.gitignore vendored Normal file
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear