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Merge branch 'master' into feature/ktln-43/working-with-lists-in-kotlin

This commit is contained in:
Anirban 2020-06-06 02:20:24 +02:00 committed by GitHub
parent aabef622a8 676f32a246
commit 18fe351a21
1141 changed files with 19869 additions and 3587 deletions
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8
algorithms-miscellaneous-5/README.md
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@ -15,9 +15,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Maximum Subarray Problem](https://www.baeldung.com/java-maximum-subarray)
- [How to Merge Two Sorted Arrays](https://www.baeldung.com/java-merge-sorted-arrays)
- [Median of Stream of Integers using Heap](https://www.baeldung.com/java-stream-integers-median-using-heap)
- [Kruskal’s Algorithm for Spanning Trees](https://www.baeldung.com/java-spanning-trees-kruskal)
- [Balanced Brackets Algorithm in Java](https://www.baeldung.com/java-balanced-brackets-algorithm)
- [Efficiently Merge Sorted Java Sequences](https://www.baeldung.com/java-merge-sorted-sequences)
- [Introduction to Greedy Algorithms with Java](https://www.baeldung.com/java-greedy-algorithms)
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4) [[next -->]](/../algorithms-miscellaneous-6)

6
algorithms-miscellaneous-5/pom.xml
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@ -25,12 +25,6 @@
<artifactId>commons-math3</artifactId>
<version>${commons-math3.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>pl.allegro.finance</groupId>
<artifactId>tradukisto</artifactId>

6
algorithms-miscellaneous-6/README.md
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@ -2,3 +2,9 @@
- [Boruvka’s Algorithm for Minimum Spanning Trees](https://www.baeldung.com/java-boruvka-algorithm)
- [Gradient Descent in Java](https://www.baeldung.com/java-gradient-descent)
- [Kruskal’s Algorithm for Spanning Trees](https://www.baeldung.com/java-spanning-trees-kruskal)
- [Balanced Brackets Algorithm in Java](https://www.baeldung.com/java-balanced-brackets-algorithm)
- [Efficiently Merge Sorted Java Sequences](https://www.baeldung.com/java-merge-sorted-sequences)
- [Introduction to Greedy Algorithms with Java](https://www.baeldung.com/java-greedy-algorithms)
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-5)

25
algorithms-miscellaneous-6/pom.xml
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@ -18,10 +18,35 @@
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-commons</artifactId>
<version>${junit.platform.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${org.assertj.core.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-math3</artifactId>
<version>${commons-math3.version}</version>
</dependency>
</dependencies>
<properties>
<guava.version>28.1-jre</guava.version>
<org.assertj.core.version>3.9.0</org.assertj.core.version>
<junit.platform.version>1.6.0</junit.platform.version>
<commons-math3.version>3.6.1</commons-math3.version>
</properties>
</project>

0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingDeque.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingDeque.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingString.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingString.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/caesarcipher/CaesarCipher.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/caesarcipher/CaesarCipher.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/greedy/Follower.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/greedy/Follower.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/greedy/FollowersPath.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/greedy/FollowersPath.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/greedy/GreedyAlgorithm.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/greedy/GreedyAlgorithm.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/greedy/NonGreedyAlgorithm.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/greedy/NonGreedyAlgorithm.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/greedy/SocialConnector.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/greedy/SocialConnector.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/greedy/SocialUser.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/greedy/SocialUser.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/kruskal/CycleDetector.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/kruskal/CycleDetector.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/kruskal/DisjointSetInfo.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/kruskal/DisjointSetInfo.java
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0
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/kruskal/Kruskal.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/kruskal/Kruskal.java
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26
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/minheapmerge/HeapNode.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/minheapmerge/HeapNode.java
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@ -1,13 +1,13 @@
package com.baeldung.algorithms.minheapmerge;
public class HeapNode {
int element;
int arrayIndex;
int nextElementIndex = 1;
public HeapNode(int element, int arrayIndex) {
this.element = element;
this.arrayIndex = arrayIndex;
}
}
package com.baeldung.algorithms.minheapmerge;
public class HeapNode {
int element;
int arrayIndex;
int nextElementIndex = 1;
public HeapNode(int element, int arrayIndex) {
this.element = element;
this.arrayIndex = arrayIndex;
}
}

176
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/minheapmerge/MinHeap.java → algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/minheapmerge/MinHeap.java
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@ -1,88 +1,88 @@
package com.baeldung.algorithms.minheapmerge;
public class MinHeap {
HeapNode[] heapNodes;
public MinHeap(HeapNode heapNodes[]) {
this.heapNodes = heapNodes;
heapifyFromLastLeafsParent();
}
void heapifyFromLastLeafsParent() {
int lastLeafsParentIndex = getParentNodeIndex(heapNodes.length);
while (lastLeafsParentIndex >= 0) {
heapify(lastLeafsParentIndex);
lastLeafsParentIndex--;
}
}
void heapify(int index) {
int leftNodeIndex = getLeftNodeIndex(index);
int rightNodeIndex = getRightNodeIndex(index);
int smallestElementIndex = index;
if (leftNodeIndex < heapNodes.length && heapNodes[leftNodeIndex].element < heapNodes[index].element) {
smallestElementIndex = leftNodeIndex;
}
if (rightNodeIndex < heapNodes.length && heapNodes[rightNodeIndex].element < heapNodes[smallestElementIndex].element) {
smallestElementIndex = rightNodeIndex;
}
if (smallestElementIndex != index) {
swap(index, smallestElementIndex);
heapify(smallestElementIndex);
}
}
int getParentNodeIndex(int index) {
return (index - 1) / 2;
}
int getLeftNodeIndex(int index) {
return (2 * index + 1);
}
int getRightNodeIndex(int index) {
return (2 * index + 2);
}
HeapNode getRootNode() {
return heapNodes[0];
}
void heapifyFromRoot() {
heapify(0);
}
void swap(int i, int j) {
HeapNode temp = heapNodes[i];
heapNodes[i] = heapNodes[j];
heapNodes[j] = temp;
}
static int[] merge(int[][] array) {
HeapNode[] heapNodes = new HeapNode[array.length];
int resultingArraySize = 0;
for (int i = 0; i < array.length; i++) {
HeapNode node = new HeapNode(array[i][0], i);
heapNodes[i] = node;
resultingArraySize += array[i].length;
}
MinHeap minHeap = new MinHeap(heapNodes);
int[] resultingArray = new int[resultingArraySize];
for (int i = 0; i < resultingArraySize; i++) {
HeapNode root = minHeap.getRootNode();
resultingArray[i] = root.element;
if (root.nextElementIndex < array[root.arrayIndex].length) {
root.element = array[root.arrayIndex][root.nextElementIndex++];
} else {
root.element = Integer.MAX_VALUE;
}
minHeap.heapifyFromRoot();
}
return resultingArray;
}
}
package com.baeldung.algorithms.minheapmerge;
public class MinHeap {
HeapNode[] heapNodes;
public MinHeap(HeapNode heapNodes[]) {
this.heapNodes = heapNodes;
heapifyFromLastLeafsParent();
}
void heapifyFromLastLeafsParent() {
int lastLeafsParentIndex = getParentNodeIndex(heapNodes.length);
while (lastLeafsParentIndex >= 0) {
heapify(lastLeafsParentIndex);
lastLeafsParentIndex--;
}
}
void heapify(int index) {
int leftNodeIndex = getLeftNodeIndex(index);
int rightNodeIndex = getRightNodeIndex(index);
int smallestElementIndex = index;
if (leftNodeIndex < heapNodes.length && heapNodes[leftNodeIndex].element < heapNodes[index].element) {
smallestElementIndex = leftNodeIndex;
}
if (rightNodeIndex < heapNodes.length && heapNodes[rightNodeIndex].element < heapNodes[smallestElementIndex].element) {
smallestElementIndex = rightNodeIndex;
}
if (smallestElementIndex != index) {
swap(index, smallestElementIndex);
heapify(smallestElementIndex);
}
}
int getParentNodeIndex(int index) {
return (index - 1) / 2;
}
int getLeftNodeIndex(int index) {
return (2 * index + 1);
}
int getRightNodeIndex(int index) {
return (2 * index + 2);
}
HeapNode getRootNode() {
return heapNodes[0];
}
void heapifyFromRoot() {
heapify(0);
}
void swap(int i, int j) {
HeapNode temp = heapNodes[i];
heapNodes[i] = heapNodes[j];
heapNodes[j] = temp;
}
static int[] merge(int[][] array) {
HeapNode[] heapNodes = new HeapNode[array.length];
int resultingArraySize = 0;
for (int i = 0; i < array.length; i++) {
HeapNode node = new HeapNode(array[i][0], i);
heapNodes[i] = node;
resultingArraySize += array[i].length;
}
MinHeap minHeap = new MinHeap(heapNodes);
int[] resultingArray = new int[resultingArraySize];
for (int i = 0; i < resultingArraySize; i++) {
HeapNode root = minHeap.getRootNode();
resultingArray[i] = root.element;
if (root.nextElementIndex < array[root.arrayIndex].length) {
root.element = array[root.arrayIndex][root.nextElementIndex++];
} else {
root.element = Integer.MAX_VALUE;
}
minHeap.heapifyFromRoot();
}
return resultingArray;
}
}

0
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingDequeUnitTest.java → algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingDequeUnitTest.java
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0
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingStringUnitTest.java → algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/balancedbrackets/BalancedBracketsUsingStringUnitTest.java
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0
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/caesarcipher/CaesarCipherUnitTest.java → algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/caesarcipher/CaesarCipherUnitTest.java
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0
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/greedy/GreedyAlgorithmUnitTest.java → algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/greedy/GreedyAlgorithmUnitTest.java
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0
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/kruskal/KruskalUnitTest.java → algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/kruskal/KruskalUnitTest.java
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44
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/minheapmerge/MinHeapUnitTest.java → algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/minheapmerge/MinHeapUnitTest.java
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@ -1,22 +1,22 @@
package com.baeldung.algorithms.minheapmerge;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import org.junit.Test;
public class MinHeapUnitTest {
private final int[][] inputArray = { { 0, 6 }, { 1, 5, 10, 100 }, { 2, 4, 200, 650 } };
private final int[] expectedArray = { 0, 1, 2, 4, 5, 6, 10, 100, 200, 650 };
@Test
public void givenSortedArrays_whenMerged_thenShouldReturnASingleSortedarray() {
int[] resultArray = MinHeap.merge(inputArray);
assertThat(resultArray.length, is(equalTo(10)));
assertThat(resultArray, is(equalTo(expectedArray)));
}
}
package com.baeldung.algorithms.minheapmerge;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import org.junit.Test;
public class MinHeapUnitTest {
private final int[][] inputArray = { { 0, 6 }, { 1, 5, 10, 100 }, { 2, 4, 200, 650 } };
private final int[] expectedArray = { 0, 1, 2, 4, 5, 6, 10, 100, 200, 650 };
@Test
public void givenSortedArrays_whenMerged_thenShouldReturnASingleSortedarray() {
int[] resultArray = MinHeap.merge(inputArray);
assertThat(resultArray.length, is(equalTo(10)));
assertThat(resultArray, is(equalTo(expectedArray)));
}
}

2
apache-cxf/README.md
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@ -3,7 +3,7 @@
This module contains articles about Apache CXF
## Relevant Articles:
- [Introduction to Apache CXF Aegis Data Binding](https://www.baeldung.com/aegis-data-binding-in-apache-cxf)
- [Apache CXF Support for RESTful Web Services](https://www.baeldung.com/apache-cxf-rest-api)
- [A Guide to Apache CXF with Spring](https://www.baeldung.com/apache-cxf-with-spring)
- [Introduction to Apache CXF](https://www.baeldung.com/introduction-to-apache-cxf)

3
apache-cxf/cxf-aegis/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Introduction to Apache CXF Aegis Data Binding](https://www.baeldung.com/aegis-data-binding-in-apache-cxf)

4
apache-shiro/pom.xml
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@ -10,9 +10,9 @@
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-1</artifactId>
<artifactId>parent-boot-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-boot-1</relativePath>
<relativePath>../parent-boot-2</relativePath>
</parent>
<dependencies>

7
apache-shiro/src/main/java/com/baeldung/Main.java
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@ -1,11 +1,14 @@
package com.baeldung;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.LockedAccountException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.realm.text.IniRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.Subject;
import org.slf4j.Logger;

22
apache-shiro/src/main/java/com/baeldung/MyCustomRealm.java
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@ -1,16 +1,24 @@
package com.baeldung;
import org.apache.shiro.authc.*;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.jdbc.JdbcRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.*;
public class MyCustomRealm extends JdbcRealm {

9
apache-shiro/src/main/java/com/baeldung/shiro/permissions/custom/Main.java
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@ -1,14 +1,15 @@
package com.baeldung.shiro.permissions.custom;
import com.baeldung.MyCustomRealm;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.LockedAccountException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.config.Ini;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.realm.text.IniRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.Subject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

3
atomikos/README.md
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@ -1,7 +1,6 @@
## Atomikos
This module contains articles about Atomikos
### Relevant Articles:
- [Guide Transactions Using Atomikos]()
- [A Guide to Atomikos](https://www.baeldung.com/java-atomikos)

3
aws-app-sync/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [AWS AppSync With Spring Boot](https://www.baeldung.com/aws-appsync-spring)

56
aws-app-sync/pom.xml Normal file
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@ -0,0 +1,56 @@
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.baeldung</groupId>
<artifactId>aws-app-sync</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>aws-app-sync</name>
<description>Spring Boot using AWS App Sync</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

32
aws-app-sync/src/main/java/com/baeldung/awsappsync/AppSyncClientHelper.java Normal file
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@ -0,0 +1,32 @@
package com.baeldung.awsappsync;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;
import java.nio.charset.StandardCharsets;
import java.util.Map;
public class AppSyncClientHelper {
static String apiUrl = "<INSERT API URL HERE>";
static String apiKey = "<INSERT API KEY HERE>";
static String API_KEY_HEADER = "x-api-key";
public static WebClient.ResponseSpec getResponseBodySpec(Map<String, Object> requestBody) {
return WebClient
.builder()
.baseUrl(apiUrl)
.defaultHeader(API_KEY_HEADER, apiKey)
.defaultHeader("Content-Type", "application/json")
.build()
.method(HttpMethod.POST)
.uri("/graphql")
.body(BodyInserters.fromValue(requestBody))
.accept(MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML)
.acceptCharset(StandardCharsets.UTF_8)
.retrieve();
}
}

13
aws-app-sync/src/main/java/com/baeldung/awsappsync/AwsAppSyncApplication.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.awsappsync;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class AwsAppSyncApplication {
public static void main(String[] args) {
SpringApplication.run(AwsAppSyncApplication.class, args);
}
}

74
aws-app-sync/src/test/java/com/baeldung/awsappsync/AwsAppSyncApplicationTests.java Normal file
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@ -0,0 +1,74 @@
package com.baeldung.awsappsync;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.web.reactive.function.client.WebClient;
import java.util.HashMap;
import java.util.Map;
import static org.junit.jupiter.api.Assertions.*;
@SpringBootTest
@Disabled
class AwsAppSyncApplicationTests {
@Test
void givenGraphQuery_whenListEvents_thenReturnAllEvents() {
Map<String, Object> requestBody = new HashMap<>();
requestBody.put("query", "query ListEvents {"
+ " listEvents {"
+ " items {"
+ " id"
+ " name"
+ " where"
+ " when"
+ " description"
+ " }"
+ " }"
+ "}");
requestBody.put("variables", "");
requestBody.put("operationName", "ListEvents");
String bodyString = AppSyncClientHelper.getResponseBodySpec(requestBody)
.bodyToMono(String.class).block();
assertNotNull(bodyString);
assertTrue(bodyString.contains("My First Event"));
assertTrue(bodyString.contains("where"));
assertTrue(bodyString.contains("when"));
}
@Test
void givenGraphAdd_whenMutation_thenReturnIdNameDesc() {
String queryString = "mutation add {"
+ " createEvent("
+ " name:\"My added GraphQL event\""
+ " where:\"Day 2\""
+ " when:\"Saturday night\""
+ " description:\"Studying GraphQL\""
+ " ){"
+ " id"
+ " name"
+ " description"
+ " }"
+ "}";
Map<String, Object> requestBody = new HashMap<>();
requestBody.put("query", queryString);
requestBody.put("variables", "");
requestBody.put("operationName", "add");
WebClient.ResponseSpec response = AppSyncClientHelper.getResponseBodySpec(requestBody);
String bodyString = response.bodyToMono(String.class).block();
assertNotNull(bodyString);
assertTrue(bodyString.contains("My added GraphQL event"));
assertFalse(bodyString.contains("where"));
assertFalse(bodyString.contains("when"));
}
}

3
bazel/bazelapp/README.md
View File

@ -1,3 +0,0 @@
### Relevant Articles:
- [Building Java Applications with Bazel](https://www.baeldung.com/bazel-build-tool)

4
cas/cas-secured-app/pom.xml
View File

@ -16,10 +16,6 @@
<relativePath>../../parent-boot-2</relativePath>
</parent>
<properties>
<spring-boot.version>2.2.6.RELEASE</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>

1
core-groovy-2/README.md
View File

@ -13,4 +13,5 @@ This module contains articles about core Groovy concepts
- [Metaprogramming in Groovy](https://www.baeldung.com/groovy-metaprogramming)
- [A Quick Guide to Working with Web Services in Groovy](https://www.baeldung.com/groovy-web-services)
- [Categories in Groovy](https://www.baeldung.com/groovy-categories)
- [How to Determine the Data Type in Groovy](https://www.baeldung.com/groovy-determine-data-type)
- [[<-- Prev]](/core-groovy)

3
core-groovy/README.md
View File

@ -12,4 +12,5 @@ This module contains articles about core Groovy concepts
- [Closures in Groovy](https://www.baeldung.com/groovy-closures)
- [Converting a String to a Date in Groovy](https://www.baeldung.com/groovy-string-to-date)
- [Guide to I/O in Groovy](https://www.baeldung.com/groovy-io)
- [[More -->]](/core-groovy-2)
- [Convert String to Integer in Groovy](https://www.baeldung.com/groovy-convert-string-to-integer)
- [[More -->]](/core-groovy-2)

1
core-java-modules/core-java-14/README.md
View File

@ -8,3 +8,4 @@ This module contains articles about Java 14.
- [Java Text Blocks](https://www.baeldung.com/java-text-blocks)
- [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof)
- [Helpful NullPointerExceptions in Java 14](https://www.baeldung.com/java-14-nullpointerexception)
- [Foreign Memory Access API in Java 14](https://www.baeldung.com/java-foreign-memory-access)

22
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/record/Person.java Normal file
View File

@ -0,0 +1,22 @@
package com.baeldung.java14.record;
import java.util.Objects;
public record Person (String name, String address) {
public static String UNKWOWN_ADDRESS = "Unknown";
public static String UNNAMED = "Unnamed";
public Person {
Objects.requireNonNull(name);
Objects.requireNonNull(address);
}
public Person(String name) {
this(name, UNKWOWN_ADDRESS);
}
public static Person unnamed(String address) {
return new Person(UNNAMED, address);
}
}

84
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/foreign/api/ForeignMemoryUnitTest.java Normal file
View File

@ -0,0 +1,84 @@
package com.baeldung.java14.foreign.api;
import jdk.incubator.foreign.*;
import org.junit.Test;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;
import java.lang.invoke.VarHandle;
import java.nio.ByteOrder;
public class ForeignMemoryUnitTest {
@Test
public void whenAValueIsSet_thenAccessTheValue() {
long value = 10;
MemoryAddress memoryAddress =
MemorySegment.allocateNative(8).baseAddress();
VarHandle varHandle = MemoryHandles.varHandle(long.class,
ByteOrder.nativeOrder());
varHandle.set(memoryAddress, value);
assertThat(varHandle.get(memoryAddress), is(value));
}
@Test
public void whenMultipleValuesAreSet_thenAccessAll() {
VarHandle varHandle = MemoryHandles.varHandle(int.class,
ByteOrder.nativeOrder());
try(MemorySegment memorySegment =
MemorySegment.allocateNative(100)) {
MemoryAddress base = memorySegment.baseAddress();
for(int i=0; i<25; i++) {
varHandle.set(base.addOffset((i*4)), i);
}
for(int i=0; i<25; i++) {
assertThat(varHandle.get(base.addOffset((i*4))), is(i));
}
}
}
@Test
public void whenSetValuesWithMemoryLayout_thenTheyCanBeRetrieved() {
SequenceLayout sequenceLayout =
MemoryLayout.ofSequence(25,
MemoryLayout.ofValueBits(64, ByteOrder.nativeOrder()));
VarHandle varHandle =
sequenceLayout.varHandle(long.class,
MemoryLayout.PathElement.sequenceElement());
try(MemorySegment memorySegment =
MemorySegment.allocateNative(sequenceLayout)) {
MemoryAddress base = memorySegment.baseAddress();
for(long i=0; i<sequenceLayout.elementCount().getAsLong(); i++) {
varHandle.set(base, i, i);
}
for(long i=0; i<sequenceLayout.elementCount().getAsLong(); i++) {
assertThat(varHandle.get(base, i), is(i));
}
}
}
@Test
public void whenSlicingMemorySegment_thenTheyCanBeAccessedIndividually() {
MemoryAddress memoryAddress =
MemorySegment.allocateNative(12).baseAddress();
MemoryAddress memoryAddress1 =
memoryAddress.segment().asSlice(0,4).baseAddress();
MemoryAddress memoryAddress2 =
memoryAddress.segment().asSlice(4,4).baseAddress();
MemoryAddress memoryAddress3 =
memoryAddress.segment().asSlice(8,4).baseAddress();
VarHandle intHandle =
MemoryHandles.varHandle(int.class, ByteOrder.nativeOrder());
intHandle.set(memoryAddress1, Integer.MIN_VALUE);
intHandle.set(memoryAddress2, 0);
intHandle.set(memoryAddress3, Integer.MAX_VALUE);
assertThat(intHandle.get(memoryAddress1), is(Integer.MIN_VALUE));
assertThat(intHandle.get(memoryAddress2), is(0));
assertThat(intHandle.get(memoryAddress3), is(Integer.MAX_VALUE));
}
}

150
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/record/PersonTest.java Normal file
View File

@ -0,0 +1,150 @@
package com.baeldung.java14.record;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
public class PersonTest {
@Test
public void givenSameNameAndAddress_whenEquals_thenPersonsEqual() {
String name = "John Doe";
String address = "100 Linda Ln.";
Person person1 = new Person(name, address);
Person person2 = new Person(name, address);
assertTrue(person1.equals(person2));
}
@Test
public void givenDifferentObject_whenEquals_thenNotEqual() {
Person person = new Person("John Doe", "100 Linda Ln.");
assertFalse(person.equals(new Object()));
}
@Test
public void givenDifferentName_whenEquals_thenPersonsNotEqual() {
String address = "100 Linda Ln.";
Person person1 = new Person("Jane Doe", address);
Person person2 = new Person("John Doe", address);
assertFalse(person1.equals(person2));
}
@Test
public void givenDifferentAddress_whenEquals_thenPersonsNotEqual() {
String name = "John Doe";
Person person1 = new Person(name, "100 Linda Ln.");
Person person2 = new Person(name, "200 London Ave.");
assertFalse(person1.equals(person2));
}
@Test
public void givenSameNameAndAddress_whenHashCode_thenPersonsEqual() {
String name = "John Doe";
String address = "100 Linda Ln.";
Person person1 = new Person(name, address);
Person person2 = new Person(name, address);
assertEquals(person1.hashCode(), person2.hashCode());
}
@Test
public void givenDifferentObject_whenHashCode_thenNotEqual() {
Person person = new Person("John Doe", "100 Linda Ln.");
assertNotEquals(person.hashCode(), new Object().hashCode());
}
@Test
public void givenDifferentName_whenHashCode_thenPersonsNotEqual() {
String address = "100 Linda Ln.";
Person person1 = new Person("Jane Doe", address);
Person person2 = new Person("John Doe", address);
assertNotEquals(person1.hashCode(), person2.hashCode());
}
@Test
public void givenDifferentAddress_whenHashCode_thenPersonsNotEqual() {
String name = "John Doe";
Person person1 = new Person(name, "100 Linda Ln.");
Person person2 = new Person(name, "200 London Ave.");
assertNotEquals(person1.hashCode(), person2.hashCode());
}
@Test
public void givenValidNameAndAddress_whenGetNameAndAddress_thenExpectedValuesReturned() {
String name = "John Doe";
String address = "100 Linda Ln.";
Person person = new Person(name, address);
assertEquals(name, person.name());
assertEquals(address, person.address());
}
@Test
public void givenValidNameAndAddress_whenToString_thenCorrectStringReturned() {
String name = "John Doe";
String address = "100 Linda Ln.";
Person person = new Person(name, address);
assertEquals("Person[name=" + name + ", address=" + address + "]", person.toString());
}
@Test(expected = NullPointerException.class)
public void givenNullName_whenConstruct_thenErrorThrown() {
new Person(null, "100 Linda Ln.");
}
@Test(expected = NullPointerException.class)
public void givenNullAddress_whenConstruct_thenErrorThrown() {
new Person("John Doe", null);
}
@Test
public void givenUnknownAddress_whenConstructing_thenAddressPopulated() {
String name = "John Doe";
Person person = new Person(name);
assertEquals(name, person.name());
assertEquals(Person.UNKWOWN_ADDRESS, person.address());
}
@Test
public void givenUnnamed_whenConstructingThroughFactory_thenNamePopulated() {
String address = "100 Linda Ln.";
Person person = Person.unnamed(address);
assertEquals(Person.UNNAMED, person.name());
assertEquals(address, person.address());
}
}

7
core-java-modules/core-java-8-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-8-datetime-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-8-datetime</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-8-datetime/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-8-datetime</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-8/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

1
core-java-modules/core-java-9-improvements/README.md
View File

@ -9,3 +9,4 @@ This module contains articles about the improvements to core Java features intro
- [Java 9 Stream API Improvements](https://www.baeldung.com/java-9-stream-api)
- [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)
- [Java 9 CompletableFuture API Improvements](https://www.baeldung.com/java-9-completablefuture)
- [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)

5
core-java-modules/core-java-9-improvements/pom.xml
View File

@ -33,6 +33,11 @@
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>

57
core-java-modules/core-java-9-improvements/src/test/java/com/baeldung/java9/io/conversion/InputStreamToByteArrayUnitTest.java Normal file
View File

@ -0,0 +1,57 @@
package com.baeldung.java9.io.conversion;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
import org.junit.Test;
import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;
public class InputStreamToByteArrayUnitTest {
@Test
public final void givenUsingPlainJavaOnFixedSizeStream_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final byte[] targetArray = new byte[initialStream.available()];
initialStream.read(targetArray);
}
@Test
public final void givenUsingPlainJavaOnUnknownSizeStream_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream is = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
final byte[] data = new byte[1024];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
final byte[] byteArray = buffer.toByteArray();
}
@Test
public void givenUsingPlainJava9_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream is = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
byte[] data = is.readAllBytes();
}
@Test
public final void givenUsingGuava_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = ByteSource.wrap(new byte[] { 0, 1, 2 })
.openStream();
final byte[] targetArray = ByteStreams.toByteArray(initialStream);
}
@Test
public final void givenUsingCommonsIO_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final byte[] targetArray = IOUtils.toByteArray(initialStream);
}
}

2
core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/inputstreamtobytes/InputStreamToByteBufferUnitTest.java → core-java-modules/core-java-9-improvements/src/test/java/com/baeldung/java9/io/conversion/InputStreamToByteBufferUnitTest.java
View File

@ -1,4 +1,4 @@
package com.baeldung.inputstreamtobytes;
package com.baeldung.java9.io.conversion;
import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;

1
core-java-modules/core-java-9-new-features/README.md
View File

@ -12,3 +12,4 @@ This module contains articles about core Java features that have been introduced
- [Introduction to Java 9 StackWalking API](https://www.baeldung.com/java-9-stackwalking-api)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Java 9 Reactive Streams](https://www.baeldung.com/java-9-reactive-streams)
- [Multi-Release JAR Files with Maven](https://www.baeldung.com/maven-multi-release-jars)

100
core-java-modules/core-java-9-new-features/pom.xml
View File

@ -28,8 +28,104 @@
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>${awaitility.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<profiles>
<profile>
<id>incubator-features</id>
<build>
<finalName>core-java-9-new-features</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<compilerArgument>--add-modules=jdk.incubator.httpclient</compilerArgument>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>--add-modules=jdk.incubator.httpclient</argLine>
</configuration>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>mrjar-generation</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>compile-java-8</id>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<source>1.8</source>
<target>1.8</target>
<compileSourceRoots>
<compileSourceRoot>${project.basedir}/src/main/java8</compileSourceRoot>
</compileSourceRoots>
</configuration>
</execution>
<execution>
<id>compile-java-9</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<release>9</release>
<compileSourceRoots>
<compileSourceRoot>${project.basedir}/src/main/java9</compileSourceRoot>
</compileSourceRoots>
<outputDirectory>${project.build.outputDirectory}/META-INF/versions/9</outputDirectory>
</configuration>
</execution>
<execution>
<id>default-testCompile</id>
<phase>test-compile</phase>
<goals>
<goal>testCompile</goal>
</goals>
<configuration>
<skip>true</skip>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>${maven-jar-plugin.version}</version>
<configuration>
<archive>
<manifestEntries>
<Multi-Release>true</Multi-Release>
</manifestEntries>
<manifest>
<mainClass>com.baeldung.multireleaseapp.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<build>
<finalName>core-java-9-new-features</finalName>
<plugins>
@ -56,8 +152,10 @@
<!-- testing -->
<assertj.version>3.10.0</assertj.version>
<junit.platform.version>1.2.0</junit.platform.version>
<awaitility.version>4.0.2</awaitility.version>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
</properties>
</project>

14
core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/App.java Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.multireleaseapp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class App {
private static final Logger logger = LoggerFactory.getLogger(App.class);
public static void main(String[] args) {
logger.info(String.format("Running on %s", new DefaultVersion().version()));
}
}

9
core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/DefaultVersion.java Normal file
View File

@ -0,0 +1,9 @@
package com.baeldung.multireleaseapp;
public class DefaultVersion implements Version {
@Override
public String version() {
return System.getProperty("java.version");
}
}

5
core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/Version.java Normal file
View File

@ -0,0 +1,5 @@
package com.baeldung.multireleaseapp;
interface Version {
public String version();
}

9
core-java-modules/core-java-9-new-features/src/main/java9/com/baeldung/multireleaseapp/DefaultVersion.java Normal file
View File

@ -0,0 +1,9 @@
package com.baeldung.multireleaseapp;
public class DefaultVersion implements Version {
@Override
public String version() {
return Runtime.version().toString();
}
}

4
core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientTest.java → core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientIntegrationTest.java
View File

@ -24,7 +24,7 @@ import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpClientTest {
public class HttpClientIntegrationTest {
@Test
public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {
@ -55,7 +55,7 @@ public class HttpClientTest {
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_MOVED_PERM));
assertThat(response.body(), containsString("https://stackoverflow.com/"));
assertThat(response.body(), containsString(""));
}
@Test

2
core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestTest.java → core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestIntegrationTest.java
View File

@ -22,7 +22,7 @@ import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpRequestTest {
public class HttpRequestIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {

2
core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseTest.java → core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseIntegrationTest.java
View File

@ -18,7 +18,7 @@ import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpResponseTest {
public class HttpResponseIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {

12
core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams.reactive/ReactiveStreamsTest.java → core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams/reactive/ReactiveStreamsUnitTest.java
View File

@ -5,10 +5,12 @@ import org.junit.Test;
import java.util.List;
import java.util.concurrent.SubmissionPublisher;
import java.util.concurrent.TimeUnit;
import static org.assertj.core.api.Java6Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThat;
import static org.awaitility.Awaitility.await;
public class ReactiveStreamsTest {
public class ReactiveStreamsUnitTest {
@Test
public void givenPublisher_whenSubscribeToIt_thenShouldConsumeAllElements() throws InterruptedException {
@ -25,7 +27,7 @@ public class ReactiveStreamsTest {
//then
await().atMost(1000, TimeUnit.MILLISECONDS).until(
await().atMost(1000, TimeUnit.MILLISECONDS).untilAsserted(
() -> assertThat(subscriber.consumedElements).containsExactlyElementsOf(items)
);
}
@ -46,7 +48,7 @@ public class ReactiveStreamsTest {
publisher.close();
//then
await().atMost(1000, TimeUnit.MILLISECONDS).until(
await().atMost(1000, TimeUnit.MILLISECONDS).untilAsserted(
() -> assertThat(subscriber.consumedElements).containsExactlyElementsOf(expectedResult)
);
}
@ -66,7 +68,7 @@ public class ReactiveStreamsTest {
publisher.close();
//then
await().atMost(1000, TimeUnit.MILLISECONDS).until(
await().atMost(1000, TimeUnit.MILLISECONDS).untilAsserted(
() -> assertThat(subscriber.consumedElements).containsExactlyElementsOf(expected)
);
}

34
core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesTest.java → core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesUnitTest.java
View File

@ -7,7 +7,7 @@ import java.lang.invoke.VarHandle;
import static org.assertj.core.api.Assertions.assertThat;
public class VariableHandlesTest {
public class VariableHandlesUnitTest {
public int publicTestVariable = 1;
private int privateTestVariable = 1;
@ -20,22 +20,22 @@ public class VariableHandlesTest {
public void whenVariableHandleForPublicVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
.in(VariableHandlesTest.class)
.findVarHandle(VariableHandlesTest.class, "publicTestVariable", int.class);
.in(VariableHandlesUnitTest.class)
.findVarHandle(VariableHandlesUnitTest.class, "publicTestVariable", int.class);
assertThat(publicIntHandle.coordinateTypes().size() == 1);
assertThat(publicIntHandle.coordinateTypes().get(0) == VariableHandles.class);
assertThat(publicIntHandle.coordinateTypes().get(0) == VariableHandlesUnitTest.class);
}
@Test
public void whenVariableHandleForPrivateVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
VarHandle privateIntHandle = MethodHandles
.privateLookupIn(VariableHandlesTest.class, MethodHandles.lookup())
.findVarHandle(VariableHandlesTest.class, "privateTestVariable", int.class);
.privateLookupIn(VariableHandlesUnitTest.class, MethodHandles.lookup())
.findVarHandle(VariableHandlesUnitTest.class, "privateTestVariable", int.class);
assertThat(privateIntHandle.coordinateTypes().size() == 1);
assertThat(privateIntHandle.coordinateTypes().get(0) == VariableHandlesTest.class);
assertThat(privateIntHandle.coordinateTypes().get(0) == VariableHandlesUnitTest.class);
}
@ -52,8 +52,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenGetIsInvoked_ThenValueOfVariableIsReturned() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
.in(VariableHandlesTest.class)
.findVarHandle(VariableHandlesTest.class, "publicTestVariable", int.class);
.in(VariableHandlesUnitTest.class)
.findVarHandle(VariableHandlesUnitTest.class, "publicTestVariable", int.class);
assertThat((int) publicIntHandle.get(this) == 1);
}
@ -62,8 +62,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenSetIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
.in(VariableHandlesTest.class)
.findVarHandle(VariableHandlesTest.class, "variableToSet", int.class);
.in(VariableHandlesUnitTest.class)
.findVarHandle(VariableHandlesUnitTest.class, "variableToSet", int.class);
publicIntHandle.set(this, 15);
assertThat((int) publicIntHandle.get(this) == 15);
@ -73,8 +73,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenCompareAndSetIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
.in(VariableHandlesTest.class)
.findVarHandle(VariableHandlesTest.class, "variableToCompareAndSet", int.class);
.in(VariableHandlesUnitTest.class)
.findVarHandle(VariableHandlesUnitTest.class, "variableToCompareAndSet", int.class);
publicIntHandle.compareAndSet(this, 1, 100);
assertThat((int) publicIntHandle.get(this) == 100);
@ -84,8 +84,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenGetAndAddIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
.in(VariableHandlesTest.class)
.findVarHandle(VariableHandlesTest.class, "variableToGetAndAdd", int.class);
.in(VariableHandlesUnitTest.class)
.findVarHandle(VariableHandlesUnitTest.class, "variableToGetAndAdd", int.class);
int before = (int) publicIntHandle.getAndAdd(this, 200);
assertThat(before == 0);
@ -96,8 +96,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenGetAndBitwiseOrIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
.in(VariableHandlesTest.class)
.findVarHandle(VariableHandlesTest.class, "variableToBitwiseOr", byte.class);
.in(VariableHandlesUnitTest.class)
.findVarHandle(VariableHandlesUnitTest.class, "variableToBitwiseOr", byte.class);
byte before = (byte) publicIntHandle.getAndBitwiseOr(this, (byte) 127);
assertThat(before == 0);

7
core-java-modules/core-java-9-streams/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-9-streams</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<build>

6
core-java-modules/core-java-annotations/pom.xml
View File

@ -10,10 +10,10 @@
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<build>

2
core-java-modules/core-java-arrays-convert/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-guides/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-multidimensional/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-operations-advanced/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-operations-basic/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

4
core-java-modules/core-java-arrays-sorting/pom.xml
View File

@ -5,8 +5,8 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>

7
core-java-modules/core-java-collections-2/pom.xml
View File

@ -7,12 +7,11 @@
<artifactId>core-java-collections-2</artifactId>
<name>core-java-collections-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-3/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-array-list/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-array-list</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-list-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-list-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-list-3/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-list-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-list/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-list</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-maps-2/pom.xml
View File

@ -7,12 +7,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

1
core-java-modules/core-java-collections-maps-3/README.md
View File

@ -5,4 +5,5 @@ This module contains articles about Map data structures in Java.
### Relevant Articles:
- [Java TreeMap vs HashMap](https://www.baeldung.com/java-treemap-vs-hashmap)
- [Comparing Two HashMaps in Java](https://www.baeldung.com/java-compare-hashmaps)
- [The Map.computeIfAbsent() Method](https://www.baeldung.com/java-map-computeifabsent)
- More articles: [[<-- prev]](/core-java-modules/core-java-collections-maps-2)

7
core-java-modules/core-java-collections-maps-3/pom.xml
View File

@ -7,12 +7,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

9
core-java-modules/core-java-collections-maps/pom.xml
View File

@ -6,12 +6,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-set/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-set</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

2
core-java-modules/core-java-concurrency-2/README.md
View File

@ -4,5 +4,5 @@
### Relevant Articles:
- [Using a Mutex Object in Java](https://www.baeldung.com/java-mutex)
- [Testing Multi-Threaded Code in Java] (https://www.baeldung.com/java-testing-multithreaded)
- [Testing Multi-Threaded Code in Java](https://www.baeldung.com/java-testing-multithreaded)

7
core-java-modules/core-java-concurrency-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-concurrency-advanced-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

2
core-java-modules/core-java-concurrency-advanced-3/README.md
View File

@ -11,4 +11,6 @@ This module contains articles about advanced topics about multithreading with co
- [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing)
- [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming)
- [Java Thread Deadlock and Livelock](https://www.baeldung.com/java-deadlock-livelock)
- [Guide to AtomicStampedReference in Java](https://www.baeldung.com/java-atomicstampedreference)
- [The ABA Problem in Concurrency](https://www.baeldung.com/cs/aba-concurrency)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

7
core-java-modules/core-java-concurrency-advanced-3/pom.xml
View File

@ -9,12 +9,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

6
core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/atomicstampedreference/StampedAccount.java
View File

@ -9,13 +9,11 @@ public class StampedAccount {
private AtomicStampedReference<Integer> account = new AtomicStampedReference<>(0, 0);
public int getBalance() {
return this.account.get(new int[1]);
return account.getReference();
}
public int getStamp() {
int[] stamps = new int[1];
this.account.get(stamps);
return stamps[0];
return account.getStamp();
}
public boolean deposit(int funds) {

60
core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/deadlockAndLivelock/DeadlockExample.java Normal file
View File

@ -0,0 +1,60 @@
package com.baeldung.deadlockAndLivelock;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class DeadlockExample {
private Lock lock1 = new ReentrantLock(true);
private Lock lock2 = new ReentrantLock(true);
public static void main(String[] args) {
DeadlockExample deadlock = new DeadlockExample();
new Thread(deadlock::operation1, "T1").start();
new Thread(deadlock::operation2, "T2").start();
}
public void operation1() {
lock1.lock();
print("lock1 acquired, waiting to acquire lock2.");
sleep(50);
lock2.lock();
print("lock2 acquired");
print("executing first operation.");
lock2.unlock();
lock1.unlock();
}
public void operation2() {
lock2.lock();
print("lock2 acquired, waiting to acquire lock1.");
sleep(50);
lock1.lock();
print("lock1 acquired");
print("executing second operation.");
lock1.unlock();
lock2.unlock();
}
public void print(String message) {
System.out.println("Thread " + Thread.currentThread()
.getName() + ": " + message);
}
public void sleep(long millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

86
core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/deadlockAndLivelock/LivelockExample.java Normal file
View File

@ -0,0 +1,86 @@
package com.baeldung.deadlockAndLivelock;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class LivelockExample {
private Lock lock1 = new ReentrantLock(true);
private Lock lock2 = new ReentrantLock(true);
public static void main(String[] args) {
LivelockExample livelock = new LivelockExample();
new Thread(livelock::operation1, "T1").start();
new Thread(livelock::operation2, "T2").start();
}
public void operation1() {
while (true) {
tryLock(lock1, 50);
print("lock1 acquired, trying to acquire lock2.");
sleep(50);
if (tryLock(lock2)) {
print("lock2 acquired.");
} else {
print("cannot acquire lock2, releasing lock1.");
lock1.unlock();
continue;
}
print("executing first operation.");
break;
}
lock2.unlock();
lock1.unlock();
}
public void operation2() {
while (true) {
tryLock(lock2, 50);
print("lock2 acquired, trying to acquire lock1.");
sleep(50);
if (tryLock(lock1)) {
print("lock1 acquired.");
} else {
print("cannot acquire lock1, releasing lock2.");
lock2.unlock();
continue;
}
print("executing second operation.");
break;
}
lock1.unlock();
lock2.unlock();
}
public void print(String message) {
System.out.println("Thread " + Thread.currentThread()
.getName() + ": " + message);
}
public void sleep(long millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void tryLock(Lock lock, long millis) {
try {
lock.tryLock(10, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public boolean tryLock(Lock lock) {
return lock.tryLock();
}
}

81
core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/lockfree/NonBlockingQueue.java Normal file
View File

@ -0,0 +1,81 @@
package com.baeldung.lockfree;
import java.util.NoSuchElementException;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
public class NonBlockingQueue<T> {
private final AtomicReference<Node<T>> head, tail;
private final AtomicInteger size;
public NonBlockingQueue() {
head = new AtomicReference<>(null);
tail = new AtomicReference<>(null);
size = new AtomicInteger();
size.set(0);
}
public void add(T element) {
if (element == null) {
throw new NullPointerException();
}
Node<T> node = new Node<>(element);
Node<T> currentTail;
do {
currentTail = tail.get();
node.setPrevious(currentTail);
} while(!tail.compareAndSet(currentTail, node));
if(node.previous != null) {
node.previous.next = node;
}
head.compareAndSet(null, node); //if we are inserting the first element
size.incrementAndGet();
}
public T get() {
if(head.get() == null) {
throw new NoSuchElementException();
}
Node<T> currentHead;
Node<T> nextNode;
do {
currentHead = head.get();
nextNode = currentHead.getNext();
} while(!head.compareAndSet(currentHead, nextNode));
size.decrementAndGet();
return currentHead.getValue();
}
public int size() {
return this.size.get();
}
private class Node<T> {
private final T value;
private volatile Node<T> next;
private volatile Node<T> previous;
public Node(T value) {
this.value = value;
this.next = null;
}
public T getValue() {
return value;
}
public Node<T> getNext() {
return next;
}
public void setPrevious(Node<T> previous) {
this.previous = previous;
}
}
}

83
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/exchanger/ExchangerPipeLineManualTest.java Normal file
View File

@ -0,0 +1,83 @@
package com.baeldung.exchanger;
import java.util.Queue;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import static java.util.concurrent.CompletableFuture.runAsync;
public class ExchangerPipeLineManualTest {
private static final int BUFFER_SIZE = 100;
@Test
public void givenData_whenPassedThrough_thenCorrect() throws InterruptedException, ExecutionException {
Exchanger<Queue<String>> readerExchanger = new Exchanger<>();
Exchanger<Queue<String>> writerExchanger = new Exchanger<>();
int counter = 0;
Runnable reader = () -> {
Queue<String> readerBuffer = new ConcurrentLinkedQueue<>();
while (true) {
readerBuffer.add(UUID.randomUUID().toString());
if (readerBuffer.size() >= BUFFER_SIZE) {
try {
readerBuffer = readerExchanger.exchange(readerBuffer);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
}
}
};
Runnable processor = () -> {
Queue<String> processorBuffer = new ConcurrentLinkedQueue<>();
Queue<String> writerBuffer = new ConcurrentLinkedQueue<>();
try {
processorBuffer = readerExchanger.exchange(processorBuffer);
while (true) {
writerBuffer.add(processorBuffer.poll());
if (processorBuffer.isEmpty()) {
try {
processorBuffer = readerExchanger.exchange(processorBuffer);
writerBuffer = writerExchanger.exchange(writerBuffer);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
}
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
Runnable writer = () -> {
Queue<String> writerBuffer = new ConcurrentLinkedQueue<>();
try {
writerBuffer = writerExchanger.exchange(writerBuffer);
while (true) {
System.out.println(writerBuffer.poll());
if (writerBuffer.isEmpty()) {
writerBuffer = writerExchanger.exchange(writerBuffer);
}
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
CompletableFuture.allOf(runAsync(reader), runAsync(processor), runAsync(writer)).get();
}
}

63
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/exchanger/ExchangerUnitTest.java Normal file
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@ -0,0 +1,63 @@
package com.baeldung.exchanger;
import static org.junit.Assert.assertEquals;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import static java.util.concurrent.CompletableFuture.runAsync;
public class ExchangerUnitTest {
@Test
public void givenThreads_whenMessageExchanged_thenCorrect() {
Exchanger<String> exchanger = new Exchanger<>();
Runnable taskA = () -> {
try {
String message = exchanger.exchange("from A");
assertEquals("from B", message);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
Runnable taskB = () -> {
try {
String message = exchanger.exchange("from B");
assertEquals("from A", message);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
CompletableFuture.allOf(runAsync(taskA), runAsync(taskB)).join();
}
@Test
public void givenThread_WhenExchangedMessage_thenCorrect() throws InterruptedException, ExecutionException {
Exchanger<String> exchanger = new Exchanger<>();
Runnable runner = () -> {
try {
String message = exchanger.exchange("from runner");
assertEquals("to runner", message);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
CompletableFuture<Void> result = CompletableFuture.runAsync(runner);
String msg = exchanger.exchange("to runner");
assertEquals("from runner", msg);
result.join();
}
}

7
core-java-modules/core-java-concurrency-advanced/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-concurrency-basic-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-basic-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<build>

7
core-java-modules/core-java-concurrency-basic/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-basic</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

9
core-java-modules/core-java-concurrency-collections-2/pom.xml
View File

@ -23,7 +23,12 @@
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
@ -42,6 +47,8 @@
<properties>
<jmh.version>1.21</jmh.version>
<guava.version>28.2-jre</guava.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
</properties>
</project>

66
core-java-modules/core-java-concurrency-collections-2/src/test/java/com/baeldung/concurrent/queue/TestConcurrentLinkedQueue.java Normal file
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@ -0,0 +1,66 @@
package com.baeldung.concurrent.queue;
import static org.assertj.core.api.Assertions.assertThat;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.junit.FixMethodOrder;
import org.junit.Test;
@FixMethodOrder
public class TestConcurrentLinkedQueue {
@Test
public void givenThereIsExistingCollection_WhenAddedIntoQueue_ThenShouldContainElements() {
Collection<Integer> elements = Arrays.asList(1, 2, 3, 4, 5);
ConcurrentLinkedQueue<Integer> concurrentLinkedQueue = new ConcurrentLinkedQueue<>(elements);
assertThat(concurrentLinkedQueue).containsExactly(1, 2, 3, 4, 5);
}
@Test
public void givenQueueIsEmpty_WhenAccessingTheQueue_ThenQueueReturnsNull() throws InterruptedException {
ExecutorService executorService = Executors.newFixedThreadPool(1);
ConcurrentLinkedQueue<Integer> concurrentLinkedQueue = new ConcurrentLinkedQueue<>();
executorService.submit(() -> assertNull("Retrieve object is null", concurrentLinkedQueue.poll()));
TimeUnit.SECONDS.sleep(1);
executorService.awaitTermination(1, TimeUnit.SECONDS);
executorService.shutdown();
}
@Test
public void givenProducerOffersElementInQueue_WhenConsumerPollsQueue_ThenItRetrievesElement() throws Exception {
int element = 1;
ExecutorService executorService = Executors.newFixedThreadPool(2);
ConcurrentLinkedQueue<Integer> concurrentLinkedQueue = new ConcurrentLinkedQueue<>();
Runnable offerTask = () -> concurrentLinkedQueue.offer(element);
Callable<Integer> pollTask = () -> {
while (concurrentLinkedQueue.peek() != null) {
return concurrentLinkedQueue.poll()
.intValue();
}
return null;
};
executorService.submit(offerTask);
TimeUnit.SECONDS.sleep(1);
Future<Integer> returnedElement = executorService.submit(pollTask);
assertThat(returnedElement.get()
.intValue(), is(equalTo(element)));
executorService.awaitTermination(1, TimeUnit.SECONDS);
executorService.shutdown();
}
}

81
core-java-modules/core-java-concurrency-collections-2/src/test/java/com/baeldung/concurrent/queue/TestLinkedBlockingQueue.java Normal file
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@ -0,0 +1,81 @@
package com.baeldung.concurrent.queue;
import static org.assertj.core.api.Assertions.assertThat;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.junit.FixMethodOrder;
import org.junit.Test;
@FixMethodOrder
public class TestLinkedBlockingQueue {
@Test
public void givenThereIsExistingCollection_WhenAddedIntoQueue_ThenShouldContainElements() {
Collection<Integer> elements = Arrays.asList(1, 2, 3, 4, 5);
LinkedBlockingQueue<Integer> linkedBlockingQueue = new LinkedBlockingQueue<>(elements);
assertThat(linkedBlockingQueue).containsExactly(1, 2, 3, 4, 5);
}
@Test
public void givenQueueIsEmpty_WhenAccessingTheQueue_ThenThreadBlocks() throws InterruptedException {
ExecutorService executorService = Executors.newFixedThreadPool(1);
LinkedBlockingQueue<Integer> linkedBlockingQueue = new LinkedBlockingQueue<>();
executorService.submit(() -> {
try {
linkedBlockingQueue.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
});
TimeUnit.SECONDS.sleep(1);
executorService.awaitTermination(1, TimeUnit.SECONDS);
executorService.shutdown();
}
@Test
public void givenProducerPutsElementInQueue_WhenConsumerAccessQueue_ThenItRetrieve() {
int element = 10;
ExecutorService executorService = Executors.newFixedThreadPool(2);
LinkedBlockingQueue<Integer> linkedBlockingQueue = new LinkedBlockingQueue<>();
Runnable putTask = () -> {
try {
linkedBlockingQueue.put(element);
} catch (InterruptedException e) {
e.printStackTrace();
}
};
Callable<Integer> takeTask = () -> {
try {
return linkedBlockingQueue.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
};
executorService.submit(putTask);
Future<Integer> returnElement = executorService.submit(takeTask);
try {
TimeUnit.SECONDS.sleep(1);
assertThat(returnElement.get()
.intValue(), is(equalTo(element)));
executorService.awaitTermination(1, TimeUnit.SECONDS);
} catch (Exception e) {
e.printStackTrace();
}
executorService.shutdown();
}
}

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