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Merge pull request #10351 from SmartyAnsh/master 

BAEL-4472- Binary Semaphore vs a ReentrantLock - Unit test added
This commit is contained in:
Eric Martin 2021-01-09 20:53:53 -06:00 committed by GitHub
parent 2376dd94b2 adfede63ba
commit c2165fa4bc
3 changed files with 106 additions and 0 deletions
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47
core-java-modules/core-java-concurrency-advanced-4/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-advanced-4</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced-4</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>
</dependencies>
<build>
<finalName>core-java-concurrency-advanced-4</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
</project>

58
core-java-modules/core-java-concurrency-advanced-4/src/test/java/com/baeldung/binarysemaphorereentrantlock/BinarySemaphoreVsReentrantLockUnitTest.java Normal file
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package com.baeldung.binarysemaphorereentrantlock;
import static org.junit.Assert.assertEquals;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.ReentrantLock;
import org.junit.Test;
public class BinarySemaphoreVsReentrantLockUnitTest {
@Test
public void givenBinarySemaphore_whenAcquireAndRelease_thenCheckAvailablePermits() throws InterruptedException {
Semaphore binarySemaphore = new Semaphore(1);
try {
binarySemaphore.acquire();
assertEquals(0, binarySemaphore.availablePermits());
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
binarySemaphore.release();
assertEquals(1, binarySemaphore.availablePermits());
}
}
@Test
public void givenReentrantLock_whenLockAndUnlock_thenCheckHoldCountAndIsLocked() throws InterruptedException {
ReentrantLock reentrantLock = new ReentrantLock();
try {
reentrantLock.lock();
assertEquals(1, reentrantLock.getHoldCount());
assertEquals(true, reentrantLock.isLocked());
} finally {
reentrantLock.unlock();
assertEquals(0, reentrantLock.getHoldCount());
assertEquals(false, reentrantLock.isLocked());
}
}
@Test
public void givenReentrantLock_whenLockMultipleTimes_thenUnlockMultipleTimesToRelease() throws InterruptedException {
ReentrantLock reentrantLock = new ReentrantLock();
try {
reentrantLock.lock();
reentrantLock.lock();
assertEquals(2, reentrantLock.getHoldCount());
assertEquals(true, reentrantLock.isLocked());
} finally {
reentrantLock.unlock();
assertEquals(1, reentrantLock.getHoldCount());
assertEquals(true, reentrantLock.isLocked());
reentrantLock.unlock();
assertEquals(0, reentrantLock.getHoldCount());
assertEquals(false, reentrantLock.isLocked());
}
}
}

1
core-java-modules/pom.xml
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@ -47,6 +47,7 @@
<module>core-java-concurrency-advanced</module>
<module>core-java-concurrency-advanced-2</module>
<module>core-java-concurrency-advanced-3</module>
<module>core-java-concurrency-advanced-4</module>
<module>core-java-concurrency-basic</module>
<module>core-java-concurrency-basic-2</module>
<module>core-java-concurrency-collections</module>