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Updated code example and test case for mutex (#7642)

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This commit is contained in:
Kamlesh Kumar
2019-08-25 21:13:47 +05:30
committed by maibin
parent 58595acd6f
commit 1888614f84
7 changed files with 45 additions and 38 deletions
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53
core-java-modules/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/mutex/MutexUnitTest.java
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@@ -1,7 +1,7 @@
package com.baeldung.concurrent.mutex;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutorService;
@@ -12,59 +12,58 @@ import java.util.concurrent.TimeUnit;
import org.junit.Assert;
import org.junit.Test;
import com.baeldung.concurrent.mutex.SequenceGenerator;
import com.baeldung.concurrent.mutex.SequenceGeneratorUsingMonitor;
import com.baeldung.concurrent.mutex.SequenceGeneratorUsingReentrantLock;
import com.baeldung.concurrent.mutex.SequenceGeneratorUsingSemaphore;
import com.baeldung.concurrent.mutex.SequenceGeneratorUsingSynchronizedBlock;
import com.baeldung.concurrent.mutex.SequenceGeneratorUsingSynchronizedMethod;
public class MutexUnitTest {
private final int RANGE = 30;
@Test
// @Test
// This test verifies the race condition use case, it may pass or fail based on execution environment
// Uncomment @Test to run it
public void givenUnsafeSequenceGenerator_whenRaceCondition_thenUnexpectedBehavior() throws Exception {
Set<Integer> uniqueSequences = getASetOFUniqueSequences(new SequenceGenerator());
Assert.assertNotEquals(RANGE, uniqueSequences.size());
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGenerator(), count);
Assert.assertNotEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingSynchronizedMethod_whenRaceCondition_thenSuccess() throws Exception {
Set<Integer> uniqueSequences = getASetOFUniqueSequences(new SequenceGeneratorUsingSynchronizedMethod());
Assert.assertEquals(RANGE, uniqueSequences.size());
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSynchronizedMethod(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingSynchronizedBlock_whenRaceCondition_thenSuccess() throws Exception {
Set<Integer> uniqueSequences = getASetOFUniqueSequences(new SequenceGeneratorUsingSynchronizedBlock());
Assert.assertEquals(RANGE, uniqueSequences.size());
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSynchronizedBlock(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingReentrantLock_whenRaceCondition_thenSuccess() throws Exception {
Set<Integer> uniqueSequences = getASetOFUniqueSequences(new SequenceGeneratorUsingReentrantLock());
Assert.assertEquals(RANGE, uniqueSequences.size());
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingReentrantLock(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingSemaphore_whenRaceCondition_thenSuccess() throws Exception {
Set<Integer> uniqueSequences = getASetOFUniqueSequences(new SequenceGeneratorUsingSemaphore());
Assert.assertEquals(RANGE, uniqueSequences.size());
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSemaphore(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingMonitor_whenRaceCondition_thenSuccess() throws Exception {
Set<Integer> uniqueSequences = getASetOFUniqueSequences(new SequenceGeneratorUsingMonitor());
Assert.assertEquals(RANGE, uniqueSequences.size());
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingMonitor(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
private Set<Integer> getASetOFUniqueSequences(SequenceGenerator generator) throws Exception {
private Set<Integer> getUniqueSequences(SequenceGenerator generator, int count) throws Exception {
ExecutorService executor = Executors.newFixedThreadPool(3);
Set<Integer> uniqueSequences = new HashSet<>();
Set<Integer> uniqueSequences = new LinkedHashSet<>();
List<Future<Integer>> futures = new ArrayList<>();
for (int i = 0; i < RANGE; i++) {
for (int i = 0; i < count; i++) {
futures.add(executor.submit(generator::getNextSequence));
}
@@ -72,7 +71,7 @@ public class MutexUnitTest {
uniqueSequences.add(future.get());
}
executor.awaitTermination(15, TimeUnit.SECONDS);
executor.awaitTermination(1, TimeUnit.SECONDS);
executor.shutdown();
return uniqueSequences;