feat: Initial commit

src/main/java/com/example/nto/service/impl/EmployeeServiceImpl.java

@@ -0,0 +1,31 @@
+package com.example.nto.service.impl;
+
+import com.example.nto.controller.dto.EmployeeDto;
+import com.example.nto.exception.EmployeeNotFoundException;
+import com.example.nto.repository.EmployeeRepository;
+import com.example.nto.service.EmployeeService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class EmployeeServiceImpl implements EmployeeService {
+
+    private final EmployeeRepository employeeRepository;
+
+    @Override
+    @Transactional(readOnly = true)
+    public EmployeeDto getByCode(String code) {
+        return employeeRepository.findByCode(code).map(EmployeeDto::toDto)
+                .orElseThrow(() -> new EmployeeNotFoundException("Employee with " + code + " code not found!"));
+    }
+
+    @Override
+    @Transactional(readOnly = true)
+    public void auth(String code) {
+        if (employeeRepository.findByCode(code).isEmpty()) {
+            throw new EmployeeNotFoundException("Employee with " + code + " code not found!");
+        }
+    }
+}