feat: Increase performance by bulk inserts

src/main/java/in/ac/amu/zhcet/service/core/StudentService.java

@@ -5,14 +5,18 @@
 import in.ac.amu.zhcet.data.model.user.Type;
 import in.ac.amu.zhcet.data.model.user.UserAuth;
 import in.ac.amu.zhcet.data.repository.StudentRepository;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.stereotype.Service;
 
 import javax.transaction.Transactional;
 import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
 
+@Slf4j
 @Service
 public class StudentService {
 
@@ -48,7 +52,7 @@ public Student getByFacultyNumber(String userId) {
         return studentRepository.getByFacultyNumber(userId);
     }
 
-    private static void initializeStudent(Student student) {
+    private static Student initializeStudent(Student student) {
         student.getUser().setType(Type.STUDENT);
 
         if (student.getUser().getUserId() == null)
@@ -59,6 +63,8 @@ private static void initializeStudent(Student student) {
             student.getUser().setPassword(student.getFacultyNumber());
 
         student.getUser().setPassword(UserAuth.PASSWORD_ENCODER.encode(student.getUser().getPassword()));
+
+        return student;
     }
 
     @Transactional
@@ -69,6 +75,25 @@ public void register(Student student) {
         studentRepository.save(student);
     }
 
+    @Transactional
+    public void register(Set<Student> students) {
+        log.info("Initializing Students");
+        List<Student> studentList = students.parallelStream()
+                .map(StudentService::initializeStudent)
+                .collect(Collectors.toList());
+        log.info("Students Initialized");
+        log.info("Saving Users");
+        List<UserAuth> userAuths = students.parallelStream()
+                .map(Student::getUser)
+                .collect(Collectors.toList());
+        log.info("Extracted Users");
+        userService.save(userAuths);
+        log.info("Saved Users");
+        log.info("Saving students");
+        studentRepository.save(studentList);
+        log.info("Saved Students");
+    }
+
     @Transactional
     public void save(Student student) {
         studentRepository.save(student);

src/main/java/in/ac/amu/zhcet/service/core/UserService.java

@@ -29,6 +29,10 @@ public void save(UserAuth userAuth) {
         userRepository.save(userAuth);
     }
 
+    public void save(List<UserAuth> userAuths) {
+        userRepository.save(userAuths);
+    }
+
     public UserAuth findById(String id) {
         return userRepository.findByUserId(id);
     }

src/main/java/in/ac/amu/zhcet/service/core/upload/StudentUploadService.java

@@ -113,8 +113,6 @@ public Confirmation<Student, String> confirmUpload(UploadResult<StudentUpload> u
 
     @Transactional
     public void registerStudents(Confirmation<Student, String> confirmation) {
-        for (Student student : confirmation.getData().keySet()) {
-            studentService.register(student);
-        }
+        studentService.register(confirmation.getData().keySet());
     }
 }