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package com.example.resourceserver.security;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Service;
import jakarta.transaction.Transactional;
@Service
public class UserService {
@Autowired
private UserRepository userRepository;
public Optional<User> findByUsername(String username) {
return userRepository.findByUsername(username);
}
public Optional<User> findById(Long id) {
return userRepository.findById(id);
}
public List<User> findAll() {
return userRepository.findAll(Sort.by(Sort.Direction.ASC, "username"));
}
@PreAuthorize("hasRole('ADMIN')")
@Transactional
public void updateUser(Long id, String description) {
// Do whatever the work needed.
// ...
Optional<User> userOpt = userRepository.findById(id);
User user = userOpt.get();
user.setDescription(description);
// NO userRepository.save(user) IS ACTUALLY REQUIRED HERE since the method
// has been annotated with @Transactional!
// Transaction commits -> Hibernate issues the SQL UPDATE.
}
}
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