Features/bael 7975 vertical slice architecture (#16817)

* BAEL-7975: vsa skeleton

* BAEL-7975: rename package

* BAEL-7975: separate usecases from domain

* BAEL-7975: wired components

* BAEL-7975: tidy test

* BAEL-7975: remove whitespace

* BAEL-7975: added missing annotations

* BAEL-7975: updaing ViewArticleUseCase

* BAEL-7975: remove service class

Author: etrandafir93

patterns-modules/vertical-slice-architecture/README.md

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+## Vertical Slice Architecture
+
+This module contains articles about Vertical Slice Architecture
+
+### Relevant articles

patterns-modules/vertical-slice-architecture/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>vertical-slice-architecture</artifactId>
+    <name>vertical-slice-architecture</name>
+
+    <properties>
+        <spring-boot.version>3.2.4</spring-boot.version> <!-- Requires at least spring framework version 6.1.X to work -->
+    </properties>
+
+    <packaging>jar</packaging>
+    <description>Vertical Slice Architecture Examples</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-3</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-3</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <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>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+            <version>${spring-boot.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/Application.java

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+package com.baeldung.hexagonal;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/controller/ArticleController.java

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+package com.baeldung.hexagonal.controller;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.hexagonal.dto.ArticleDto;
+import com.baeldung.hexagonal.persistence.entity.Article;
+import com.baeldung.hexagonal.service.ArticleService;
+
+@RestController
+@RequestMapping("articles")
+public class ArticleController {
+
+    private final ArticleService articleService;
+
+    public ArticleController(ArticleService articleService) {
+        this.articleService = articleService;
+    }
+
+    @PostMapping
+    public ArticleDto createArticle(@RequestBody ArticleDto dto) {
+        var article = mapToEntity(dto);
+        var entity = articleService.create(article);
+        return mapToDto(entity);
+    }
+
+    @PutMapping
+    public ArticleDto update(@RequestBody ArticleDto dto) {
+        var updatedArticle = articleService.update(dto.id(), dto.content());
+        return mapToDto(updatedArticle);
+    }
+
+    @GetMapping("{id}")
+    public ResponseEntity<ArticleDto> readArticle(@PathVariable Long id) {
+        var article = articleService.findById(id)
+            .map(ArticleController::mapToDto);
+        return ResponseEntity.of(article);
+    }
+
+    private static ArticleDto mapToDto(Article entity) {
+        return new ArticleDto(entity.getId(), entity.getName(), entity.getContent(), entity.getSlug());
+    }
+
+    private static Article mapToEntity(ArticleDto dto) {
+        return new Article(dto.id(), dto.name(), dto.content(), dto.slug());
+    }
+
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/controller/CommentController.java

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+package com.baeldung.hexagonal.controller;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.hexagonal.service.ArticleService;
+import com.baeldung.hexagonal.service.CommentService;
+
+@RestController
+@RequestMapping("comments")
+public class CommentController {
+
+    private final CommentService service;
+
+    public CommentController(CommentService service) {
+        this.service = service;
+    }
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/controller/RecommendationController.java

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+package com.baeldung.hexagonal.controller;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.hexagonal.service.RecommendationService;
+
+@RestController
+@RequestMapping("recommendations")
+public class RecommendationController {
+
+    private final RecommendationService service;
+
+    public RecommendationController(RecommendationService service) {
+        this.service = service;
+    }
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/dto/ArticleDto.java

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+package com.baeldung.hexagonal.dto;
+
+public record ArticleDto(Long id, String name, String content, String slug) {
+
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/dto/CommentDto.java

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+package com.baeldung.hexagonal.dto;
+
+public class CommentDto {
+
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/dto/RecommendationDto.java

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+package com.baeldung.hexagonal.dto;
+
+public class RecommendationDto {
+
+}

patterns-modules/vertical-slice-architecture/src/main/java/com/baeldung/hexagonal/dto/UserDto.java

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+package com.baeldung.hexagonal.dto;
+
+public class UserDto {
+
+}