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Merge pull request #17238 from etrandafir93/features/BAEL-8199-ddd_jmolecules
BAEL-8199: jMolecules DDD
2 parents c4fd58c + d047012 commit 6e9b565

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8 files changed

+266
-3
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8 files changed

+266
-3
lines changed

‎patterns-modules/ddd/pom.xml

+35-3
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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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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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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<artifactId>ddd</artifactId>
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<name>ddd</name>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-validation</artifactId>
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</dependency>
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<dependency>
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<groupId>org.jmolecules.integrations</groupId>
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<artifactId>jmolecules-starter-ddd</artifactId>
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<version>${jmolecules-integration.version}</version>
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</dependency>
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<dependency>
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<groupId>org.jmolecules.integrations</groupId>
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<artifactId>jmolecules-starter-test</artifactId>
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<version>${jmolecules-integration.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.jmolecules</groupId>
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<artifactId>jmolecules-archunit</artifactId>
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<version>${jmolecules-archunit.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.tngtech.archunit</groupId>
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<artifactId>archunit</artifactId>
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<version>${archunit.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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</dependencies>
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<properties>
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<java.version>17</java.version>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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<start-class>com.baeldung.ddd.PersistingDddAggregatesApplication</start-class>
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<joda-money.version>1.0.1</joda-money.version>
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<de.flapdoodle.embed.mongo.version>4.11.1</de.flapdoodle.embed.mongo.version>
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<jmolecules-integration.version>0.21.0</jmolecules-integration.version>
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<jmolecules-archunit.version>1.0.0</jmolecules-archunit.version>
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<archunit.version>1.3.0</archunit.version>
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</properties>
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</project>
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</project>

‎patterns-modules/ddd/src/main/java/com/baeldung/dddjmolecules/article/Article.java

+98
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package com.baeldung.dddjmolecules.article;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import org.jmolecules.ddd.annotation.AggregateRoot;
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import org.jmolecules.ddd.annotation.Identity;
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import com.baeldung.dddjmolecules.author.Username;
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@AggregateRoot
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public class Article {
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@Identity
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private Slug slug;
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private Username author;
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private String title;
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private String content;
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private Status status;
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private List<Comment> comments;
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private List<Username> likedBy;
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enum Status {
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DRAFT, PUBLISHED, HIDDEN, ARCHIVED
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}
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public Article(Username author, String content, String title) {
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this.status = Status.DRAFT;
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this.author = author;
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this.title = title;
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this.content = content;
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this.slug = new Slug(title.toLowerCase()
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.replaceAll(" ", "-"));
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this.comments = new ArrayList<>();
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this.likedBy = new ArrayList<>();
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}
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void publish() {
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if (status == Status.DRAFT || status == Status.HIDDEN) {
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status = Status.PUBLISHED;
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}
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throw new IllegalStateException("we cannot publish an article with status=" + status);
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}
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void hide() {
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if (status == Status.PUBLISHED) {
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status = Status.HIDDEN;
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}
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throw new IllegalStateException("we cannot hide an article with status=" + status);
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}
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void archive() {
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if (status != Status.ARCHIVED) {
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status = Status.ARCHIVED;
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}
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throw new IllegalStateException("the article is already archived");
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}
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void comment(Username user, String message) {
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comments.add(new Comment(user, message));
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}
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void like(Username user) {
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likedBy.add(user);
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}
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void dislike(Username user) {
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likedBy.remove(user);
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}
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public Slug getSlug() {
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return slug;
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}
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public Username getAuthor() {
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return author;
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}
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public String getTitle() {
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return title;
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}
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public String getContent() {
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return content;
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}
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public Status getStatus() {
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return status;
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}
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public List<Comment> getComments() {
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return Collections.unmodifiableList(comments);
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}
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public List<Username> getLikedBy() {
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return Collections.unmodifiableList(likedBy);
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}
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}

‎patterns-modules/ddd/src/main/java/com/baeldung/dddjmolecules/article/Articles.java

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package com.baeldung.dddjmolecules.article;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Optional;
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import org.jmolecules.ddd.annotation.Repository;
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import com.baeldung.dddjmolecules.article.Article.Status;
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@Repository
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public class Articles {
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Slug save(Article draft) {
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// save to DB
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return draft.getSlug();
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}
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Optional<Article> find(Slug slug) {
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// query DB
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return Optional.empty();
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}
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List<Article> filterByStatus(Status status) {
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// query DB
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return new ArrayList<>();
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}
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void remove(Slug article) {
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// update DB and mark as removed
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}
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}

‎patterns-modules/ddd/src/main/java/com/baeldung/dddjmolecules/article/Comment.java

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package com.baeldung.dddjmolecules.article;
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import java.time.Instant;
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import java.util.UUID;
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import org.jmolecules.ddd.annotation.Entity;
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import org.jmolecules.ddd.annotation.Identity;
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import com.baeldung.dddjmolecules.author.Username;
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@Entity
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public class Comment {
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@Identity
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private final String id;
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private final Username author;
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private String message;
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private Instant lastModified;
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Comment(Username author, String message) {
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this.id = UUID.randomUUID()
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.toString();
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this.author = author;
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this.message = message;
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this.lastModified = Instant.now();
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}
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public void edit(String newMessage) {
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this.message = newMessage;
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this.lastModified = Instant.now();
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}
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}

‎patterns-modules/ddd/src/main/java/com/baeldung/dddjmolecules/article/Slug.java

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package com.baeldung.dddjmolecules.article;
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import org.jmolecules.ddd.annotation.ValueObject;
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import org.springframework.util.Assert;
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@ValueObject
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public class Slug {
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private final String value;
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Slug(String value) {
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Assert.isTrue(value != null, "Article's slug cannot be null!");
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Assert.isTrue(value.length() >= 5, "Article's slug should be at least 5 characters long!");
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this.value = value;
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}
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public String value() {
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return value;
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}
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}

‎patterns-modules/ddd/src/main/java/com/baeldung/dddjmolecules/author/Author.java

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package com.baeldung.dddjmolecules.author;
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import org.jmolecules.ddd.annotation.AggregateRoot;
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import org.jmolecules.ddd.annotation.Identity;
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import org.jmolecules.ddd.annotation.ValueObject;
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import com.baeldung.dddjmolecules.article.Slug;
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@AggregateRoot
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public class Author {
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@Identity
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private Username username;
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private Email email;
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private Slug latestArticle;
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@ValueObject
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record Email(String address) {
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}
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// constructor, getters, setters
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}

‎patterns-modules/ddd/src/main/java/com/baeldung/dddjmolecules/author/Username.java

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package com.baeldung.dddjmolecules.author;
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import org.jmolecules.ddd.annotation.ValueObject;
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import org.springframework.util.Assert;
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@ValueObject
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public record Username(String value) {
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public Username {
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Assert.isTrue(value != null && !value.isBlank(), "Username value cannot be null or blank.");
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}
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}

‎patterns-modules/ddd/src/test/java/com/baeldung/dddjmolecules/JMoleculesDddUnitTest.java

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package com.baeldung.dddjmolecules;
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import org.jmolecules.archunit.JMoleculesDddRules;
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import com.tngtech.archunit.core.domain.JavaClasses;
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import com.tngtech.archunit.junit.AnalyzeClasses;
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import com.tngtech.archunit.junit.ArchTest;
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@AnalyzeClasses(packages = "com.baeldung.dddjmolecules")
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class JMoleculesDddUnitTest {
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@ArchTest
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void whenCheckingAllClasses_thenCodeFollowsAllDddPrinciples(JavaClasses classes) {
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JMoleculesDddRules.all()
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.check(classes);
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}
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}
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