Hexagonal Architecture in Java

patterns/hexagonal-architecture/src/main/java/com/baeldung/pattern/simplehexagonalexample/controller/FurnitureController.java

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+package com.baeldung.pattern.simplehexagonalexample.controller;
+
+import com.baeldung.pattern.simplehexagonalexample.domain.model.Furniture;
+import com.baeldung.pattern.simplehexagonalexample.domain.services.FurnitureService;
+import org.springframework.beans.factory.annotation.Autowired;
+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 org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/furniture")
+public class FurnitureController {
+
+    @Autowired
+    private FurnitureService furnitureService;
+
+    @PostMapping
+    public void manufactureFurniture(@RequestBody Furniture furniture) {
+        furnitureService.manufactureFurniture(furniture);
+    }
+
+    @GetMapping(path = "/{name}")
+    public Furniture getFurniture(@PathVariable String name) {
+        return furnitureService.getFurniture(name);
+    }
+
+    @GetMapping
+    public List<Furniture> listFurniture() {
+        return furnitureService.listAllFurniture();
+    }
+}
+

patterns/hexagonal-architecture/src/main/java/com/baeldung/pattern/simplehexagonalexample/domain/model/Furniture.java

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+package com.baeldung.pattern.simplehexagonalexample.domain.model;
+
+import java.io.Serializable;
+
+public class Furniture implements Serializable {
+
+    private String name;
+    private String color;
+    private int length;
+    private int breadth;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public int getLength() {
+        return length;
+    }
+
+    public void setLength(int length) {
+        this.length = length;
+    }
+
+    public int getBreadth() {
+        return breadth;
+    }
+
+    public void setBreadth(int breadth) {
+        this.breadth = breadth;
+    }
+}

patterns/hexagonal-architecture/src/main/java/com/baeldung/pattern/simplehexagonalexample/domain/services/FurnitureService.java

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+package com.baeldung.pattern.simplehexagonalexample.domain.services;
+
+import com.baeldung.pattern.simplehexagonalexample.domain.model.Furniture;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public interface FurnitureService {
+
+    Furniture manufactureFurniture(Furniture furniture);
+
+    Furniture getFurniture(String name);
+
+    List<Furniture> listAllFurniture();
+}

patterns/hexagonal-architecture/src/main/java/com/baeldung/pattern/simplehexagonalexample/domain/services/FurnitureServiceImpl.java

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+package com.baeldung.pattern.simplehexagonalexample.domain.services;
+
+import com.baeldung.pattern.simplehexagonalexample.domain.model.Furniture;
+import com.baeldung.pattern.simplehexagonalexample.persistance.FurnitureRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.util.List;
+
+public class FurnitureServiceImpl implements FurnitureService {
+
+    private final FurnitureRepository furnitureRepository;
+
+    @Autowired
+    public FurnitureServiceImpl(FurnitureRepository furnitureRepository) {
+        this.furnitureRepository = furnitureRepository;
+    }
+
+    @Override
+    public Furniture manufactureFurniture(Furniture furniture) {
+        return furnitureRepository.manufactureFurniture(furniture);
+    }
+
+    @Override
+    public Furniture getFurniture(String name) {
+        return furnitureRepository.getFurniture(name);
+    }
+
+    @Override
+    public List<Furniture> listAllFurniture() {
+        return furnitureRepository.listAllFurniture();
+    }
+}

patterns/hexagonal-architecture/src/main/java/com/baeldung/pattern/simplehexagonalexample/persistance/FurnitureRepository.java

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+package com.baeldung.pattern.simplehexagonalexample.persistance;
+
+import com.baeldung.pattern.simplehexagonalexample.domain.model.Furniture;
+
+import java.util.List;
+
+public interface FurnitureRepository {
+
+    Furniture manufactureFurniture(Furniture furniture);
+
+    Furniture getFurniture(String name);
+
+    List<Furniture> listAllFurniture();
+}

patterns/hexagonal-architecture/src/main/java/com/baeldung/pattern/simplehexagonalexample/persistance/FurnitureRepositoryImpl.java

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+package com.baeldung.pattern.simplehexagonalexample.persistance;
+
+import com.baeldung.pattern.simplehexagonalexample.domain.model.Furniture;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class FurnitureRepositoryImpl implements FurnitureRepository {
+
+    private final Map<String, Furniture> furnitureStore = new HashMap<>();
+
+    @Override
+    public Furniture manufactureFurniture(Furniture furniture) {
+        return furnitureStore.put(furniture.getName(), furniture);
+    }
+
+    @Override
+    public Furniture getFurniture(String name) {
+        return furnitureStore.get(name);
+    }
+
+    @Override
+    public List<Furniture> listAllFurniture() {
+        return null;
+    }
+}

patterns/hexagonal-architecture/src/test/java/com/baeldung/pattern/hexagonal/domain/services/FurnitureServiceImplUnitTest.java

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+package com.baeldung.pattern.hexagonal.domain.services;
+
+import com.baeldung.pattern.simplehexagonalexample.domain.model.Furniture;
+import com.baeldung.pattern.simplehexagonalexample.domain.services.FurnitureService;
+import com.baeldung.pattern.simplehexagonalexample.domain.services.FurnitureServiceImpl;
+import com.baeldung.pattern.simplehexagonalexample.persistance.FurnitureRepository;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class FurnitureServiceImplUnitTest {
+
+    private final List<Furniture> testModelList = new ArrayList<>();
+    private FurnitureRepository furnitureRepository;
+    private FurnitureService testService;
+    private Furniture testModel1;
+    private Furniture testModel2;
+
+    @BeforeEach
+    void setUp() {
+        furnitureRepository = mock(FurnitureRepository.class);
+
+        testService = new FurnitureServiceImpl(furnitureRepository);
+        testModel1 = new Furniture();
+        testModel1.setName("bed");
+        testModel1.setColor("brown");
+        testModel1.setLength(50);
+        testModel1.setBreadth(40);
+
+        testModel2 = new Furniture();
+        testModel2.setName("sofa");
+        testModel2.setColor("brown");
+        testModel2.setLength(50);
+        testModel2.setBreadth(20);
+
+        testModelList.add(testModel1);
+        testModelList.add(testModel2);
+    }
+
+    @Test
+    void manufactureFurniture() {
+        when(furnitureRepository.manufactureFurniture(any(Furniture.class))).thenReturn(testModel1);
+
+        Furniture testResponse = testService.manufactureFurniture(testModel1);
+        assertEquals(testModel1, testResponse);
+    }
+
+    @Test
+    void getFurniture() {
+        when(furnitureRepository.getFurniture("bed")).thenReturn(testModel1);
+
+        Furniture testResponse = testService.getFurniture("bed");
+        assertEquals(testModel1, testResponse);
+    }
+
+    @Test
+    void listAllFurniture() {
+        when(furnitureRepository.listAllFurniture()).thenReturn(Arrays.asList(testModel1, testModel2));
+
+        List<Furniture> testResponse = testService.listAllFurniture();
+        assertEquals(testModelList, testResponse);
+    }
+}