From aab81cebd55f744c87e6e9a27e2f68bc16fb556f Mon Sep 17 00:00:00 2001
From: haerong22 <haerong22@naver.com>
Date: Wed, 31 Mar 2021 23:18:02 +0900
Subject: [PATCH] =?UTF-8?q?spring=20mvc=20:=20servlet,=20jsp,=20mvc=20patt?=
 =?UTF-8?q?ern=20-=20=ED=9A=8C=EC=9B=90=20=EA=B4=80=EB=A6=AC=20=EC=9B=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../example/servlet/domain/member/Member.java | 20 ++++++++
 .../domain/member/MemberRepository.java       | 40 ++++++++++++++++
 .../domain/member/MemberRepositoryTest.java   | 47 +++++++++++++++++++
 3 files changed, 107 insertions(+)
 create mode 100644 spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/Member.java
 create mode 100644 spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/MemberRepository.java
 create mode 100644 spring-mvc/servlet/src/test/java/com/example/servlet/domain/member/MemberRepositoryTest.java

diff --git a/spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/Member.java b/spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/Member.java
new file mode 100644
index 00000000..a9a426a2
--- /dev/null
+++ b/spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/Member.java
@@ -0,0 +1,20 @@
+package com.example.servlet.domain.member;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter @Setter
+public class Member {
+
+    private Long id;
+    private String username;
+    private int age;
+
+    public Member() {
+    }
+
+    public Member(String username, int age) {
+        this.username = username;
+        this.age = age;
+    }
+}
diff --git a/spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/MemberRepository.java b/spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/MemberRepository.java
new file mode 100644
index 00000000..3f13039a
--- /dev/null
+++ b/spring-mvc/servlet/src/main/java/com/example/servlet/domain/member/MemberRepository.java
@@ -0,0 +1,40 @@
+package com.example.servlet.domain.member;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class MemberRepository {
+    // 동시성 문제 -> ConcurrentHashMap, AtomicLong 사용
+    private static Map<Long, Member> store = new HashMap<>();
+    private static long sequence = 0L;
+
+    // singleton
+    private static final MemberRepository instance = new MemberRepository();
+
+    public static MemberRepository getInstance() {
+        return instance;
+    }
+
+    private MemberRepository() {
+    }
+
+    public Member save(Member member) {
+        member.setId(++sequence);
+        store.put(member.getId(), member);
+        return member;
+    }
+
+    public Member findById(Long id) {
+        return store.get(id);
+    }
+
+    public List<Member> findAll() {
+        return new ArrayList<>(store.values());
+    }
+
+    public void clearStore() {
+        store.clear();
+    }
+}
diff --git a/spring-mvc/servlet/src/test/java/com/example/servlet/domain/member/MemberRepositoryTest.java b/spring-mvc/servlet/src/test/java/com/example/servlet/domain/member/MemberRepositoryTest.java
new file mode 100644
index 00000000..75ea58de
--- /dev/null
+++ b/spring-mvc/servlet/src/test/java/com/example/servlet/domain/member/MemberRepositoryTest.java
@@ -0,0 +1,47 @@
+package com.example.servlet.domain.member;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+class MemberRepositoryTest {
+
+    MemberRepository memberRepository = MemberRepository.getInstance();
+
+    @AfterEach
+    void afterEach() {
+        memberRepository.clearStore();
+    }
+
+    @Test
+    void save() throws Exception {
+        // given
+        Member member = new Member("hello", 20);
+
+        // when
+        Member savedMember = memberRepository.save(member);
+
+        // then
+        Member findMember = memberRepository.findById(savedMember.getId());
+        Assertions.assertThat(findMember).isEqualTo(savedMember);
+    }
+
+    @Test
+    void findAll() throws Exception {
+        // given
+        Member member1 = new Member("member1", 20);
+        Member member2 = new Member("member2", 30);
+
+        memberRepository.save(member1);
+        memberRepository.save(member2);
+
+        // when
+        List<Member> result = memberRepository.findAll();
+
+        // then
+        Assertions.assertThat(result.size()).isEqualTo(2);
+        Assertions.assertThat(result).contains(member1, member2);
+    }
+}
\ No newline at end of file