jdbc step4 주드 미션 제출합니다 (#552)

* 패키지 위치 변경 및 코드 정리

* feat: 트랜잭션 required 형태 전파

* refactor: exception 처리 수정

---------

Co-authored-by: kang-hyungu <hkkang@woowahan.com>

app/src/main/java/com/techcourse/dao/UserDao.java

@@ -5,7 +5,6 @@
 import org.springframework.jdbc.core.RowMapper;
 import org.springframework.jdbc.exception.ResultSetMappingException;
 
-import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.List;
 
@@ -29,39 +28,39 @@ public UserDao(final JdbcTemplate jdbcTemplate) {
         this.jdbcTemplate = jdbcTemplate;
     }
 
-    public void insert(final Connection conn, final User user) {
+    public void insert(final User user) {
         final String sql = "insert into users (account, password, email) values (?, ?, ?)";
 
-        jdbcTemplate.update(conn, sql, user.getAccount(), user.getPassword(), user.getEmail());
+        jdbcTemplate.update(sql, user.getAccount(), user.getPassword(), user.getEmail());
     }
 
-    public void update(final Connection conn, final User user) {
+    public void update(final User user) {
         final var sql = "update users set account = ?, email = ?, password = ? where id = ?";
 
-        jdbcTemplate.update(conn, sql, user.getAccount(), user.getEmail(), user.getPassword(), user.getId());
+        jdbcTemplate.update(sql, user.getAccount(), user.getEmail(), user.getPassword(), user.getId());
     }
 
-    public List<User> findAll(final Connection conn) {
+    public List<User> findAll() {
         final String sql = "select * from users";
 
-        return jdbcTemplate.query(conn, sql, ROW_MAPPER);
+        return jdbcTemplate.query(sql, ROW_MAPPER);
     }
 
-    public User findById(final Connection conn, final Long id) {
+    public User findById(final Long id) {
         final var sql = "select id, account, password, email from users where id = ?";
 
-        return jdbcTemplate.queryForObject(conn, sql, ROW_MAPPER, id);
+        return jdbcTemplate.queryForObject(sql, ROW_MAPPER, id);
     }
 
-    public User findByAccount(final Connection conn, final String account) {
+    public User findByAccount(final String account) {
         final var sql = "select id, account, password, email from users where account = ?";
 
-        return jdbcTemplate.queryForObject(conn, sql, ROW_MAPPER, account);
+        return jdbcTemplate.queryForObject(sql, ROW_MAPPER, account);
     }
 
-    public void deleteAll(final Connection conn) {
+    public void deleteAll() {
         final var sql = "delete from users";
 
-        jdbcTemplate.update(conn, sql);
+        jdbcTemplate.update(sql);
     }
 }

app/src/main/java/com/techcourse/dao/UserHistoryDao.java

@@ -5,8 +5,6 @@
 import org.slf4j.LoggerFactory;
 import org.springframework.jdbc.core.JdbcTemplate;
 
-import java.sql.Connection;
-
 public class UserHistoryDao {
 
     private static final Logger log = LoggerFactory.getLogger(UserHistoryDao.class);
@@ -17,11 +15,10 @@ public UserHistoryDao(final JdbcTemplate jdbcTemplate) {
         this.jdbcTemplate = jdbcTemplate;
     }
 
-    public void log(final Connection conn, final UserHistory userHistory) {
+    public void log(final UserHistory userHistory) {
         final var sql = "insert into user_history (user_id, account, password, email, created_at, created_by) values (?, ?, ?, ?, ?, ?)";
 
         jdbcTemplate.update(
-                conn,
                 sql,
                 userHistory.getUserId(),
                 userHistory.getAccount(),

app/src/main/java/com/techcourse/service/AppUserService.java

@@ -0,0 +1,35 @@
+package com.techcourse.service;
+
+import com.techcourse.dao.UserDao;
+import com.techcourse.dao.UserHistoryDao;
+import com.techcourse.domain.User;
+import com.techcourse.domain.UserHistory;
+
+public class AppUserService implements UserService {
+
+    private final UserDao userDao;
+    private final UserHistoryDao userHistoryDao;
+
+    public AppUserService(UserDao userDao, UserHistoryDao userHistoryDao) {
+        this.userDao = userDao;
+        this.userHistoryDao = userHistoryDao;
+    }
+
+    @Override
+    public User findById(long id) {
+        return userDao.findById(id);
+    }
+
+    @Override
+    public void insert(User user) {
+        userDao.insert(user);
+    }
+
+    @Override
+    public void changePassword(long id, String newPassword, String createBy) {
+        final var user = findById(id);
+        user.changePassword(newPassword);
+        userDao.update(user);
+        userHistoryDao.log(new UserHistory(user, createBy));
+    }
+}

app/src/main/java/com/techcourse/service/TxUserService.java

@@ -0,0 +1,30 @@
+package com.techcourse.service;
+
+import com.techcourse.domain.User;
+import org.springframework.transaction.support.TransactionTemplate;
+
+public class TxUserService implements UserService {
+
+    private final UserService userService;
+    private final TransactionTemplate transactionTemplate;
+
+    public TxUserService(UserService userService, TransactionTemplate transactionTemplate) {
+        this.userService = userService;
+        this.transactionTemplate = transactionTemplate;
+    }
+
+    @Override
+    public User findById(final long id) {
+        return transactionTemplate.execute(() -> userService.findById(id));
+    }
+
+    @Override
+    public void insert(final User user) {
+        transactionTemplate.execute(() -> userService.insert(user));
+    }
+
+    @Override
+    public void changePassword(final long id, final String newPassword, final String createBy) {
+        transactionTemplate.execute(() -> userService.changePassword(id, newPassword, createBy));
+    }
+}

app/src/main/java/com/techcourse/service/UserService.java

@@ -1,81 +1,12 @@
 package com.techcourse.service;
 
-import com.techcourse.config.DataSourceConfig;
-import com.techcourse.dao.UserDao;
-import com.techcourse.dao.UserHistoryDao;
 import com.techcourse.domain.User;
-import com.techcourse.domain.UserHistory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import javax.sql.DataSource;
-import java.sql.SQLException;
+public interface UserService {
 
-public class UserService {
+    User findById(final long id);
 
-    private static final Logger log = LoggerFactory.getLogger(UserService.class);
+    void insert(final User user);
 
-    private final UserDao userDao;
-    private final UserHistoryDao userHistoryDao;
-    private final DataSource dataSource = DataSourceConfig.getInstance();
-
-    public UserService(final UserDao userDao, final UserHistoryDao userHistoryDao) {
-        this.userDao = userDao;
-        this.userHistoryDao = userHistoryDao;
-    }
-
-    public User findById(final long id) {
-        try (final var conn = dataSource.getConnection()) {
-            try {
-                conn.setAutoCommit(false);
-
-                return userDao.findById(conn, id);
-            } catch (Exception e) {
-                conn.rollback();
-            } finally {
-                conn.setAutoCommit(true);
-            }
-            conn.commit();
-        } catch (SQLException e) {
-            log.info(e.getMessage());
-        }
-        throw new RuntimeException();
-    }
-
-    public void insert(final User user) {
-        try (final var conn = dataSource.getConnection()) {
-            try {
-                conn.setAutoCommit(false);
-
-                userDao.insert(conn, user);
-            } catch (Exception e) {
-                conn.rollback();
-            } finally {
-                conn.setAutoCommit(true);
-            }
-            conn.commit();
-        } catch (SQLException e) {
-            log.info(e.getMessage());
-        }
-    }
-
-    public void changePassword(final long id, final String newPassword, final String createBy) {
-        try (final var conn = dataSource.getConnection()) {
-            try {
-                conn.setAutoCommit(false);
-
-                final var user = findById(id);
-                user.changePassword(newPassword);
-                userDao.update(conn, user);
-                userHistoryDao.log(conn, new UserHistory(user, createBy));
-            } catch (Exception e) {
-                conn.rollback();
-            } finally {
-                conn.setAutoCommit(true);
-            }
-            conn.commit();
-        } catch (SQLException e) {
-            log.info(e.getMessage());
-        }
-    }
+    void changePassword(final long id, final String newPassword, final String createBy);
 }

app/src/test/java/com/techcourse/dao/UserDaoTest.java

@@ -35,27 +35,27 @@ void setup() {
 
         userDao = new UserDao(new JdbcTemplate(DataSourceConfig.getInstance()));
         final var user = new User("gugu", "password", "hkkang@woowahan.com");
-        userDao.insert(conn, user);
+        userDao.insert(user);
     }
 
     @Test
     void findAll() {
-        final var users = userDao.findAll(conn);
+        final var users = userDao.findAll();
 
         assertThat(users).isNotEmpty();
     }
 
     @Test
     void findById() {
-        final var user = userDao.findById(conn, 1L);
+        final var user = userDao.findById(1L);
 
         assertThat(user.getAccount()).isEqualTo("gugu");
     }
 
     @Test
     void findByAccount() {
         final var account = "gugu";
-        final var user = userDao.findByAccount(conn, account);
+        final var user = userDao.findByAccount(account);
 
         assertThat(user.getAccount()).isEqualTo(account);
     }
@@ -64,39 +64,39 @@ void findByAccount() {
     void insert() {
         final var account = "insert-gugu";
         final var user = new User(account, "password", "hkkang@woowahan.com");
-        userDao.insert(conn, user);
+        userDao.insert(user);
 
-        final var actual = userDao.findById(conn, 2L);
+        final var actual = userDao.findById(2L);
 
         assertThat(actual.getAccount()).isEqualTo(account);
     }
 
     @Test
     void update() {
         final var newPassword = "password99";
-        final var user = userDao.findById(conn, 1L);
+        final var user = userDao.findById(1L);
         user.changePassword(newPassword);
 
-        userDao.update(conn, user);
+        userDao.update(user);
 
-        final var actual = userDao.findById(conn, 1L);
+        final var actual = userDao.findById(1L);
 
         assertThat(actual.getPassword()).isEqualTo(newPassword);
     }
 
     @Test
     void deleteAll() {
-        userDao.deleteAll(conn);
+        userDao.deleteAll();
 
-        List<User> users = userDao.findAll(conn);
+        List<User> users = userDao.findAll();
         assertThat(users).isEmpty();
     }
 
     @Test
     void findObjectReturnNull() {
-        userDao.deleteAll(conn);
+        userDao.deleteAll();
 
-        assertThatThrownBy(() -> userDao.findById(conn, 1L))
+        assertThatThrownBy(() -> userDao.findById(1L))
                 .isInstanceOf(DataAccessException.class);
     }
 }

app/src/test/java/com/techcourse/service/MockUserHistoryDao.java

@@ -5,16 +5,14 @@
 import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.core.JdbcTemplate;
 
-import java.sql.Connection;
-
 public class MockUserHistoryDao extends UserHistoryDao {
 
     public MockUserHistoryDao(final JdbcTemplate jdbcTemplate) {
         super(jdbcTemplate);
     }
 
     @Override
-    public void log(Connection conn, final UserHistory userHistory) {
+    public void log(final UserHistory userHistory) {
         throw new DataAccessException();
     }
 }

app/src/test/java/com/techcourse/service/UserServiceTest.java → app/src/test/java/com/techcourse/service/TxUserServiceTest.java

@@ -7,31 +7,35 @@
 import com.techcourse.support.jdbc.init.DatabasePopulatorUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.core.JdbcTemplate;
-
-import java.sql.SQLException;
+import org.springframework.transaction.support.TransactionManager;
+import org.springframework.transaction.support.TransactionTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
-class UserServiceTest {
+class TxUserServiceTest {
 
     private JdbcTemplate jdbcTemplate;
     private UserDao userDao;
 
     @BeforeEach
-    void setUp() throws SQLException {
+    void setUp() {
         this.jdbcTemplate = new JdbcTemplate(DataSourceConfig.getInstance());
         this.userDao = new UserDao(jdbcTemplate);
 
         DatabasePopulatorUtils.execute(DataSourceConfig.getInstance());
         final var user = new User("gugu", "password", "hkkang@woowahan.com");
-        userDao.insert(DataSourceConfig.getInstance().getConnection(), user);
+        userDao.insert(user);
     }
 
     @Test
     void testChangePassword() {
+        final var transactionTemplate = new TransactionTemplate(new TransactionManager(DataSourceConfig.getInstance()));
         final var userHistoryDao = new UserHistoryDao(jdbcTemplate);
-        final var userService = new UserService(userDao, userHistoryDao);
+        final var appUserService = new AppUserService(userDao, userHistoryDao);
+        final var userService = new TxUserService(appUserService, transactionTemplate);
 
         final var newPassword = "qqqqq";
         final var createBy = "gugu";
@@ -43,15 +47,19 @@ void testChangePassword() {
     }
 
     @Test
-    void testTransactionRollback() {
+    void testTransactionRollback2() {
         // 트랜잭션 롤백 테스트를 위해 mock으로 교체
         final var userHistoryDao = new MockUserHistoryDao(jdbcTemplate);
-        final var userService = new UserService(userDao, userHistoryDao);
+        // 애플리케이션 서비스
+        final var appUserService = new AppUserService(userDao, userHistoryDao);
+        // 트랜잭션 서비스 추상화
+        final var userService = new TxUserService(appUserService, new TransactionTemplate(new TransactionManager(DataSourceConfig.getInstance())));
 
         final var newPassword = "newPassword";
         final var createBy = "gugu";
         // 트랜잭션이 정상 동작하는지 확인하기 위해 의도적으로 MockUserHistoryDao에서 예외를 발생시킨다.
-        userService.changePassword(1L, newPassword, createBy);
+        assertThrows(DataAccessException.class,
+                () -> userService.changePassword(1L, newPassword, createBy));
 
         final var actual = userService.findById(1L);