commiting code for hexagonal archi(eval article)

hexagonal-example/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>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.1.6.RELEASE</version>
+		<relativePath /> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.baeldung</groupId>
+	<artifactId>HexagonalLibrary</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>HexagonalLibrary</name>
+	<description>HexagonalLibrary</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>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+				<configuration>
+					<mainClass>com.baeldung.HexagonalLibrary</mainClass>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

hexagonal-example/src/com/baeldung/HexagonalLibrary.java

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

hexagonal-example/src/com/baeldung/hexagonalPattern/adapter/LibraryRepoImpl.java

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+package com.baeldung.hexagonalPattern.adapter;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.ports.LibraryRepo;
+
+@Repository
+public class LibraryRepoImpl implements LibraryRepo {
+	// This class is the actual implementation of the out bound port/adapter.
+
+	private HashMap<String, Book> books = new HashMap<String, Book>();
+
+	@Override
+	public void insertBook(Book book) {
+		// Mock Database call here.
+		books.put("mock", new Book("mock", "mock", "mock"));
+	}
+
+	@Override
+	public Book searchBook(String name) {
+		// TODO Auto-generated method stub
+		Book b = new Book();
+		// Some code for retrieval of book from db
+		return b;
+	}
+
+	@Override
+	public List<Book> getAllBooks() {
+		// Fetch all books from db
+		return books.values().stream().collect(Collectors.toList());
+	}
+
+}

hexagonal-example/src/com/baeldung/hexagonalPattern/adapter/LibraryRestController.java

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+package com.baeldung.hexagonalPattern.adapter;
+
+import java.util.List;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.web.LibraryRestUI;
+
+@RestController
+public class LibraryRestController implements LibraryRestUI {
+
+	@Override
+	@RequestMapping("/library")
+	public void insertBook(Book book) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	@GetMapping("/searchBook")
+	public Book searchBook(@PathVariable String name) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	@GetMapping("/listBooks")
+	public List<Book> listAllBooks() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+}

hexagonal-example/src/com/baeldung/hexagonalPattern/core/domain/Book.java

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+package com.baeldung.hexagonalPattern.core.domain;
+
+public class Book {
+
+	private String name;
+	private String author_list;
+	private String isbn13;
+
+	/* constructors and getter and setters */
+	public Book(String string, String string2, String string3) {
+		// TODO Auto-generated constructor stub
+	}
+
+	public Book() {
+		// TODO Auto-generated constructor stub
+	}
+
+	/*
+	 * public String getName() { return name; }
+	 * 
+	 * public void setName(String name) { this.name = name; }
+	 * 
+	 * public String getAuthor_list() { return author_list; }
+	 * 
+	 * public void setAuthor_list(String author_list) { this.author_list =
+	 * author_list; }
+	 * 
+	 * public String getIsbn13() { return isbn13; }
+	 * 
+	 * public void setIsbn13(String isbn13) { this.isbn13 = isbn13; }
+	 */
+
+}

hexagonal-example/src/com/baeldung/hexagonalPattern/core/impl/LibraryServiceImpl.java

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+package com.baeldung.hexagonalPattern.core.impl;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import com.baeldung.hexagonalPattern.core.domain.Book;
+import com.baeldung.hexagonalPattern.ports.LibraryRepo;
+import com.baeldung.hexagonalPattern.ports.LibraryService;
+
+@Service
+public class LibraryServiceImpl implements LibraryService {
+
+	// This is the class which actually implements the methods from the ports.
+	// The ports are just for exposing the methods to the outside.
+
+	@Autowired
+	private LibraryRepo bookRepo;
+
+	@Override
+	public void insertBook(Book book) {
+		// TODO some implementation to insert record in the db or similar
+		bookRepo.insertBook(book);
+	}
+
+	@Override
+	public Book lendBook(String name) {
+		// TODO Auto-generated method stub
+		return bookRepo.searchBook(name);
+	}
+
+	@Override
+	public List<Book> getAllBooks() {
+		// TODO Auto-generated method
+		return null;
+	}
+
+}

hexagonal-example/src/com/baeldung/hexagonalPattern/ports/LibraryRepo.java

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+package com.baeldung.hexagonalPattern.ports;
+
+import java.util.List;
+import com.baeldung.hexagonalPattern.core.domain.Book;
+
+public interface LibraryRepo {
+	// Outbound Port.
+
+	public void insertBook(Book book);
+
+	public Book searchBook(String name);
+
+	public List<Book> getAllBooks();
+}

hexagonal-example/src/com/baeldung/hexagonalPattern/ports/LibraryService.java

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+package com.baeldung.hexagonalPattern.ports;
+
+import java.util.List;
+import com.baeldung.hexagonalPattern.core.domain.Book;
+
+public interface LibraryService {
+//This is the in bound port.exposes the application to the world. 
+
+	public void insertBook(Book book);
+
+	public Book lendBook(String name);
+
+	List<Book> getAllBooks();
+
+}

hexagonal-example/src/com/baeldung/hexagonalPattern/web/LibraryRestUI.java

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+package com.baeldung.hexagonalPattern.web;
+
+import java.util.List;
+
+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.RequestBody;
+
+import com.baeldung.hexagonalPattern.core.domain.Book;
+
+public interface LibraryRestUI {
+	// This is the in bound Adapter
+
+	@PostMapping
+	void insertBook(@RequestBody Book book);
+
+	@GetMapping("/{name}")
+	public Book searchBook(@PathVariable String name);
+
+	@GetMapping
+	public List<Book> listAllBooks();
+
+}