diff --git a/core-java-modules/core-java-concurrency-testing/.gitignore b/core-java-modules/core-java-concurrency-testing/.gitignore new file mode 100644 index 0000000000..3de4cc647e --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/.gitignore @@ -0,0 +1,26 @@ +*.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 \ No newline at end of file diff --git a/core-java-modules/core-java-concurrency-testing/README.md b/core-java-modules/core-java-concurrency-testing/README.md new file mode 100644 index 0000000000..fef74a6750 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/README.md @@ -0,0 +1,7 @@ +========= + +## Core Java Concurrency Testing Examples + +### Relevant Articles: +- [Testing Multi-Threaded Code in Java](https://www.baeldung.com/java-testing-multithreaded) + diff --git a/core-java-modules/core-java-concurrency-testing/pom.xml b/core-java-modules/core-java-concurrency-testing/pom.xml new file mode 100644 index 0000000000..bb3e6f5152 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/pom.xml @@ -0,0 +1,93 @@ + + + 4.0.0 + core-java-concurrency-testing + 0.1.0-SNAPSHOT + core-java-concurrency-testing + jar + + + com.baeldung + parent-java + 0.0.1-SNAPSHOT + ../../parent-java + + + + + junit + junit + 4.13 + test + + + com.googlecode.thread-weaver + threadweaver + 0.2 + test + + + com.google.code.tempus-fugit + tempus-fugit + 1.1 + test + + + com.googlecode.multithreadedtc + multithreadedtc + 1.01 + test + + + org.openjdk.jcstress + jcstress-core + 0.5 + + + + + + + org.apache.maven.plugins + maven-compiler-plugin + 3.1 + + ${javac.target} + ${javac.target} + ${javac.target} + + + + + org.apache.maven.plugins + maven-shade-plugin + 2.2 + + + main + package + + shade + + + jcstress + + + org.openjdk.jcstress.Main + + + META-INF/TestList + + + + + + + + + + diff --git a/core-java-modules/core-java-concurrency-testing/src/main/java/com/baeldung/concurrent/MyCounter.java b/core-java-modules/core-java-concurrency-testing/src/main/java/com/baeldung/concurrent/MyCounter.java new file mode 100644 index 0000000000..a678b047a8 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/main/java/com/baeldung/concurrent/MyCounter.java @@ -0,0 +1,22 @@ +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; + } + +} diff --git a/core-java-modules/core-java-concurrency-testing/src/main/resources/logback.xml b/core-java-modules/core-java-concurrency-testing/src/main/resources/logback.xml new file mode 100644 index 0000000000..56af2d397e --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/main/resources/logback.xml @@ -0,0 +1,19 @@ + + + + + %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n + + + + + + + + + + + + + + \ No newline at end of file diff --git a/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterJCStressUnitTest.java b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterJCStressUnitTest.java new file mode 100644 index 0000000000..6c76505347 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterJCStressUnitTest.java @@ -0,0 +1,36 @@ +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(); + } + +} diff --git a/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterMultithreadedTCUnitTest.java b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterMultithreadedTCUnitTest.java new file mode 100644 index 0000000000..eb4e77cae9 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterMultithreadedTCUnitTest.java @@ -0,0 +1,35 @@ +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); + } +} diff --git a/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterSimpleUnitTest.java b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterSimpleUnitTest.java new file mode 100644 index 0000000000..4f3409b923 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterSimpleUnitTest.java @@ -0,0 +1,57 @@ +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()); + } + +} diff --git a/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterTempusFugitUnitTest.java b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterTempusFugitUnitTest.java new file mode 100644 index 0000000000..360c61b4f4 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterTempusFugitUnitTest.java @@ -0,0 +1,35 @@ +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); + } + +} diff --git a/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterThreadWeaverUnitTest.java b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterThreadWeaverUnitTest.java new file mode 100644 index 0000000000..29b08996cd --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/test/java/com/baeldung/concurrent/MyCounterThreadWeaverUnitTest.java @@ -0,0 +1,42 @@ +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); + } + +} \ No newline at end of file diff --git a/core-java-modules/core-java-concurrency-testing/src/test/resources/.gitignore b/core-java-modules/core-java-concurrency-testing/src/test/resources/.gitignore new file mode 100644 index 0000000000..83c05e60c8 --- /dev/null +++ b/core-java-modules/core-java-concurrency-testing/src/test/resources/.gitignore @@ -0,0 +1,13 @@ +*.class + +#folders# +/target +/neoDb* +/data +/src/main/webapp/WEB-INF/classes +*/META-INF/* + +# Packaged files # +*.jar +*.war +*.ear \ No newline at end of file