BAEL-1423 Java Concurrency Utility with JCTools Library
This commit is contained in:
Denis Zhdanov
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323f5bf370
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11
jctools/README.md
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11
jctools/README.md
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## Overview
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This project holds a [couple of tests](./src/test/java/com/baeldung/jctools/JCToolsUnitTest.java) which illustrate JCTools specifics and a [benchmark](./src/main/java/com/baeldung/jctools/MpmcBenchmark.java) in the [JMH](http://openjdk.java.net/projects/code-tools/jmh/) format.
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## How to build and run the JMH benchmark
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Execute the following from the project's root:
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```bash
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mvn clean install
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java -jar ./target/benchmarks.jar MpmcBenchmark -si true
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```
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108
jctools/pom.xml
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jctools/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>jctools</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>jctools</name>
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<dependencies>
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<dependency>
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<groupId>org.jctools</groupId>
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<artifactId>jctools-core</artifactId>
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<version>${jctools.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-core</artifactId>
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<version>${jmh.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-annprocess</artifactId>
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<version>${jmh.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<properties>
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<jctools.version>2.1.2</jctools.version>
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<assertj.version>3.9.1</assertj.version>
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<jmh.version>1.20</jmh.version>
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<javac.target>1.8</javac.target>
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<uberjar.name>benchmarks</uberjar.name>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.1</version>
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<configuration>
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<compilerVersion>${javac.target}</compilerVersion>
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<source>${javac.target}</source>
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<target>${javac.target}</target>
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</configuration>
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</plugin>
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<!-- Borrowed from the 'jmh-java-benchmark-archetype' pom.xml -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>2.2</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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<configuration>
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<finalName>${uberjar.name}</finalName>
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<transformers>
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<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<mainClass>org.openjdk.jmh.Main</mainClass>
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</transformer>
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</transformers>
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<filters>
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<filter>
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<!--
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Shading signed JARs will fail without this.
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http://stackoverflow.com/questions/999489/invalid-signature-file-when-attempting-to-run-a-jar
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-->
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<artifact>*:*</artifact>
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<excludes>
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<exclude>META-INF/*.SF</exclude>
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<exclude>META-INF/*.DSA</exclude>
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<exclude>META-INF/*.RSA</exclude>
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</excludes>
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</filter>
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</filters>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>
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package com.baeldung.jctools;
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import org.jctools.queues.MpmcArrayQueue;
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import org.jctools.queues.atomic.MpmcAtomicArrayQueue;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Control;
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import java.util.Queue;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.TimeUnit;
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@BenchmarkMode(Mode.SampleTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Fork(1)
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@Warmup(iterations = 1)
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@Measurement(iterations = 3)
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public class MpmcBenchmark {
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public static final String GROUP_UNSAFE = "MpmcArrayQueue";
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public static final String GROUP_AFU = "MpmcAtomicArrayQueue";
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public static final String GROUP_JDK = "ArrayBlockingQueue";
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public static final int PRODUCER_THREADS_NUMBER = 32;
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public static final int CONSUMER_THREADS_NUMBER = 32;
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public static final int CAPACITY = 128;
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@State(Scope.Group)
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public static class Mpmc {
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public final Queue<Long> queue = new MpmcArrayQueue<>(CAPACITY);
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}
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@State(Scope.Group)
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public static class MpmcAtomic {
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public final Queue<Long> queue = new MpmcAtomicArrayQueue<>(CAPACITY);
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}
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@State(Scope.Group)
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public static class Jdk {
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public final Queue<Long> queue = new ArrayBlockingQueue<>(CAPACITY);
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}
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@Benchmark
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@Group(GROUP_UNSAFE)
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@GroupThreads(PRODUCER_THREADS_NUMBER)
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public void mpmcWrite(Control control, Mpmc state) {
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write(control, state.queue);
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}
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@Benchmark
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@Group(GROUP_UNSAFE)
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@GroupThreads(CONSUMER_THREADS_NUMBER)
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public void mpmcRead(Control control, Mpmc state) {
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read(control, state.queue);
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}
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@Benchmark
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@Group(GROUP_AFU)
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@GroupThreads(PRODUCER_THREADS_NUMBER)
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public void mpmcAtomicWrite(Control control, MpmcAtomic state) {
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write(control, state.queue);
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}
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@Benchmark
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@Group(GROUP_AFU)
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@GroupThreads(CONSUMER_THREADS_NUMBER)
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public void mpmcAtomicRead(Control control, MpmcAtomic state) {
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read(control, state.queue);
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}
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@Benchmark
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@Group(GROUP_JDK)
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@GroupThreads(PRODUCER_THREADS_NUMBER)
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public void jdkWrite(Control control, Jdk state) {
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write(control, state.queue);
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}
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@Benchmark
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@Group(GROUP_JDK)
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@GroupThreads(CONSUMER_THREADS_NUMBER)
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public void jdkRead(Control control, Jdk state) {
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read(control, state.queue);
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}
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private void write(Control control, Queue<Long> queue) {
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//noinspection StatementWithEmptyBody
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while (!control.stopMeasurement && !queue.offer(1L)) {
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// Is intentionally left blank
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}
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}
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private void read(Control control, Queue<Long> queue) {
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//noinspection StatementWithEmptyBody
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while (!control.stopMeasurement && queue.poll() == null) {
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// Is intentionally left blank
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}
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}
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}
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@ -0,0 +1,86 @@
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package com.baeldung.jctools;
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import org.jctools.queues.SpscArrayQueue;
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import org.jctools.queues.SpscChunkedArrayQueue;
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import org.junit.Test;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.atomic.AtomicReference;
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import java.util.function.IntConsumer;
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import java.util.stream.Collectors;
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import java.util.stream.IntStream;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.fail;
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public class JCToolsUnitTest {
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@Test
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public void givenMultipleProducers_whenSpscQueueUsed_thenNoWarningOccurs() throws InterruptedException {
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SpscArrayQueue<Integer> queue = new SpscArrayQueue<Integer>(2);
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Thread producer1 = new Thread(() -> {
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queue.offer(1);
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});
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producer1.start();
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producer1.join();
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Thread producer2 = new Thread(() -> {
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queue.offer(2);
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});
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producer2.start();
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producer2.join();
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Set<Integer> fromQueue = new HashSet<>();
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Thread consumer = new Thread(() -> queue.drain(fromQueue::add));
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consumer.start();
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consumer.join();
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assertThat(fromQueue).containsOnly(1, 2);
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}
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@Test
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public void whenQueueIsFull_thenNoMoreElementsCanBeAdded() throws InterruptedException {
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SpscChunkedArrayQueue<Integer> queue = new SpscChunkedArrayQueue<>(8, 16);
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assertThat(queue.capacity()).isEqualTo(16);
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CountDownLatch startConsuming = new CountDownLatch(1);
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CountDownLatch awakeProducer = new CountDownLatch(1);
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AtomicReference<Throwable> error = new AtomicReference<>();
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Thread producer = new Thread(() -> {
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IntStream.range(0, queue.capacity()).forEach(i -> {
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assertThat(queue.offer(i)).isTrue();
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});
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assertThat(queue.offer(queue.capacity())).isFalse();
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startConsuming.countDown();
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try {
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awakeProducer.await();
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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assertThat(queue.offer(queue.capacity())).isTrue();
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});
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producer.setUncaughtExceptionHandler((t, e) -> {
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error.set(e);
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startConsuming.countDown();
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});
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producer.start();
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startConsuming.await();
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if (error.get() != null) {
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fail("Producer's assertion failed", error.get());
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}
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Set<Integer> fromQueue = new HashSet<>();
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queue.drain(fromQueue::add);
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awakeProducer.countDown();
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producer.join();
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queue.drain(fromQueue::add);
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assertThat(fromQueue).containsAll(IntStream.range(0, 17).boxed().collect(Collectors.toSet()));
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}
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}
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