refactor : /v1/employee 성능 개성

- repository에 캐시 사용
- N+1문제 해결 -> @entitygraph를 사용해서 즉시로딩
- N:1 관계인 Team을 지연로딩으로 변경
- 쓸모없는 컬럼제거
- email 인덱스 생성

issue #189

src/main/java/ga/backend/BackendApplication.java

@@ -3,6 +3,7 @@
 import org.joda.time.DateTime;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
@@ -12,6 +13,7 @@
 @SpringBootApplication
 @EnableJpaAuditing
 @EnableScheduling
+@EnableCaching
 public class BackendApplication {
 
 	@PostConstruct

src/main/java/ga/backend/employee/controller/EmployeeController.java

@@ -11,6 +11,9 @@
 import ga.backend.team.repository.TeamRepository;
 import ga.backend.util.Version;
 import lombok.AllArgsConstructor;
+import org.springframework.cache.Cache;
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
@@ -73,11 +76,17 @@ public ResponseEntity getEmployee(@Positive @PathVariable("employee-pk") long em
 
     // 토큰으로 employee 정보 조회하기
     @GetMapping
+//    @Cacheable(value = "employeeCache")
     public ResponseEntity getEmployee() {
         Employee employee = employeeService.findEmployeeByToken();
-        EmployeeResponseDto.Response response = employeeMapper.employeeToEmployeeResponseDto(employee);
-        TeamResponseDto.Response teamResponse = teamMapper.teamToTeamResponseDto(employee.getTeam(), employee.getCompany().getPk());
-        response.setTeamResponseDto(teamResponse);
+        EmployeeResponseDto.SimpleResponse response = employeeMapper.employeeToEmployeeSimpleResponseDto(employee);
+
+        // ResponseDto.Response 반환
+//        EmployeeResponseDto.Response response = employeeMapper.employeeToEmployeeSimpleResponseDto(employee);
+//        if(employee.getTeam() != null) {
+//            TeamResponseDto.Response teamResponse = teamMapper.teamToTeamResponseDto(employee.getTeam(), employee.getCompany().getPk());
+//            response.setTeamResponseDto(teamResponse);
+//        }
 
         return new ResponseEntity<>(response, HttpStatus.OK);
     }

src/main/java/ga/backend/employee/dto/EmployeeResponseDto.java

@@ -26,6 +26,19 @@ public static class Response {
         private LocalDateTime modifiedAt;
     }
 
+    @AllArgsConstructor
+    @Setter
+    @Getter
+    public static class SimpleResponse {
+        private Long pk;
+        private String id; // 사번
+        private Long KakaoId; // 카카오톡 ID
+        private String email;
+        private String name; // 이름
+        private Long year; // 연차
+        private boolean regiYn;
+    }
+
     @AllArgsConstructor
     @Setter
     @Getter

src/main/java/ga/backend/employee/entity/Employee.java

@@ -1,6 +1,5 @@
 package ga.backend.employee.entity;
 
-//import ga.backend.analysis.entity.Analysis;
 import ga.backend.analysis.entity.Analysis;
 import ga.backend.auditable.Auditable;
 import ga.backend.company.entity.Company;
@@ -24,6 +23,7 @@
 @Getter
 @Setter
 @NoArgsConstructor
+@Cacheable
 public class Employee extends Auditable {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
@@ -71,7 +71,7 @@ public class Employee extends Auditable {
     @JoinColumn(name = "company_pk")
     private Company company;
 
-    @ManyToOne
+    @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "team_pk")
     private Team team;
 

src/main/java/ga/backend/employee/mapper/EmployeeMapper.java

@@ -17,6 +17,7 @@ public interface EmployeeMapper {
     Employee employeePatchDtoToEmployee(EmployeeRequestDto.Patch patch);
     Employee employeeChangePasswordToEmployee(EmployeeRequestDto.ChangePassword changePassword);
     EmployeeResponseDto.Response employeeToEmployeeResponseDto(Employee employee);
+    EmployeeResponseDto.SimpleResponse employeeToEmployeeSimpleResponseDto(Employee employee);
 
     List<EmployeeResponseDto.Response> employeeToEmployeeListResponseDto(List<Employee> employees);
 }

src/main/java/ga/backend/employee/repository/EmployeeRepository.java

@@ -2,6 +2,8 @@
 
 import ga.backend.employee.entity.Employee;
 import ga.backend.team.entity.Team;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.data.jpa.repository.EntityGraph;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
@@ -10,6 +12,8 @@
 
 @Repository
 public interface EmployeeRepository extends JpaRepository<Employee, Long> {
+    @Cacheable(value = "employees", key = "#email")
+    @EntityGraph(attributePaths = {"company", "roles"})
     Optional<Employee> findByEmailAndDelYnFalse(String email);
     List<Employee> findFistByIdAndDelYnFalse(String id);
     Optional<Employee> findByPkAndDelYnFalse(long pk);

src/main/java/ga/backend/employee/service/EmployeeService.java

@@ -12,12 +12,18 @@
 import ga.backend.team.service.TeamService;
 import ga.backend.util.FindEmployee;
 import lombok.AllArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cache.Cache;
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.cache.concurrent.ConcurrentMapCache;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
 import java.util.Optional;
+import java.util.concurrent.ConcurrentMap;
 
 @Service
 @AllArgsConstructor
@@ -112,9 +118,7 @@ public Employee findEmployeeByPk(long employeePk) {
 
     // 토큰으로 직원 조회
     public Employee findEmployeeByToken() {
-        Employee employee = findEmployee.getLoginEmployeeByToken();
-
-        return employee;
+        return findEmployee.getLoginEmployeeByToken();
     }
 
     // UPDATE