spring mvc : item domain

spring-mvc/item-service/src/main/java/com/example/itemservice/domain/item/Item.java

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+package com.example.itemservice.domain.item;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter @Setter
+public class Item {
+
+    private Long id;
+    private String itemName;
+    private Integer price;
+    private Integer quantity;
+
+    public Item() {
+    }
+
+    public Item(String itemName, Integer price, Integer quantity) {
+        this.itemName = itemName;
+        this.price = price;
+        this.quantity = quantity;
+    }
+}

spring-mvc/item-service/src/main/java/com/example/itemservice/domain/item/ItemRepository.java

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+package com.example.itemservice.domain.item;
+
+import org.springframework.stereotype.Repository;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Repository
+public class ItemRepository {
+
+    private static final Map<Long, Item> store = new HashMap<>(); // static
+    private static long sequence = 0L; // static
+
+    public Item save(Item item) {
+        item.setId(++sequence);
+        store.put(item.getId(), item);
+        return item;
+    }
+
+    public Item findById(Long id) {
+        return store.get(id);
+    }
+
+    public List<Item> findAll() {
+        return new ArrayList<>(store.values());
+    }
+
+    public void update(Long itemId, Item updateParam) {
+        Item findItem = findById(itemId);
+        findItem.setItemName(updateParam.getItemName());
+        findItem.setPrice(updateParam.getPrice());
+        findItem.setQuantity(updateParam.getQuantity());
+    }
+
+    public void clearStore() {
+        store.clear();
+    }
+}

spring-mvc/item-service/src/test/java/com/example/itemservice/domain/item/ItemRepositoryTest.java

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+package com.example.itemservice.domain.item;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ItemRepositoryTest {
+
+    ItemRepository itemRepository = new ItemRepository();
+
+    @AfterEach
+    void afterEach() {
+        itemRepository.clearStore();
+    }
+
+    @Test
+    void save() throws Exception {
+        // given
+        Item item = new Item("itemA", 10000, 10);
+
+        // when
+        Item savedItem = itemRepository.save(item);
+
+        // then
+        Item findItem = itemRepository.findById(item.getId());
+        assertThat(findItem).isEqualTo(savedItem);
+    }
+
+    @Test
+    void findAll() throws Exception {
+        // given
+        Item item1 = new Item("itemA", 10000, 10);
+        Item item2 = new Item("itemB", 15000, 20);
+
+        itemRepository.save(item1);
+        itemRepository.save(item2);
+
+        // when
+        List<Item> result = itemRepository.findAll();
+
+        // then
+        assertThat(result.size()).isEqualTo(2);
+        assertThat(result).contains(item1, item2);
+    }
+
+    @Test
+    void update() throws Exception {
+        // given
+        Item item = new Item("itemA", 10000, 10);
+
+        Item savedItem = itemRepository.save(item);
+        Long itemId = savedItem.getId();
+
+        // when
+        Item updateParam = new Item("itemB", 20000, 30);
+        itemRepository.update(itemId, updateParam);
+
+        // then
+        Item findItem = itemRepository.findById(itemId);
+
+        assertThat(findItem.getItemName()).isEqualTo(updateParam.getItemName());
+        assertThat(findItem.getPrice()).isEqualTo(updateParam.getPrice());
+        assertThat(findItem.getQuantity()).isEqualTo(updateParam.getQuantity());
+    }
+}