backend/src/main/java/org/raddatz/familienarchiv/service/PersonService.java

@@ -13,11 +13,13 @@ import org.raddatz.familienarchiv.dto.PersonUpdateDTO;
 import org.raddatz.familienarchiv.exception.DomainException;
 import org.raddatz.familienarchiv.exception.ErrorCode;
 import org.raddatz.familienarchiv.model.Person;
+import org.raddatz.familienarchiv.model.PersonDisplayNameChangedEvent;
 import org.raddatz.familienarchiv.model.PersonNameAlias;
 import org.raddatz.familienarchiv.model.PersonNameAliasType;
 import org.raddatz.familienarchiv.model.PersonType;
 import org.raddatz.familienarchiv.repository.PersonNameAliasRepository;
 import org.raddatz.familienarchiv.repository.PersonRepository;
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -31,6 +33,7 @@ public class PersonService {
 
     private final PersonRepository personRepository;
     private final PersonNameAliasRepository aliasRepository;
+    private final ApplicationEventPublisher eventPublisher;
 
     public List<PersonSummaryDTO> findAll(String q) {
         if (q == null) {
@@ -157,6 +160,7 @@ public class PersonService {
         validateYears(dto.getBirthYear(), dto.getDeathYear());
         Person person = personRepository.findById(id)
                 .orElseThrow(() -> DomainException.notFound(ErrorCode.PERSON_NOT_FOUND, "Person not found: " + id));
+        String oldDisplayName = person.getDisplayName();
         person.setPersonType(dto.getPersonType());
         person.setTitle(dto.getTitle() == null || dto.getTitle().isBlank() ? null : dto.getTitle().trim());
         person.setFirstName(dto.getFirstName());
@@ -165,7 +169,12 @@ public class PersonService {
         person.setNotes(dto.getNotes() == null || dto.getNotes().isBlank() ? null : dto.getNotes().trim());
         person.setBirthYear(dto.getBirthYear());
         person.setDeathYear(dto.getDeathYear());
-        return personRepository.save(person);
+        Person saved = personRepository.save(person);
+        String newDisplayName = saved.getDisplayName();
+        if (!Objects.equals(oldDisplayName, newDisplayName)) {
+            eventPublisher.publishEvent(new PersonDisplayNameChangedEvent(id, oldDisplayName, newDisplayName));
+        }
+        return saved;
     }
 
     @Transactional

backend/src/test/java/org/raddatz/familienarchiv/service/PersonServiceTest.java

@@ -2,6 +2,7 @@ package org.raddatz.familienarchiv.service;
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
@@ -10,11 +11,13 @@ import org.raddatz.familienarchiv.dto.PersonSummaryDTO;
 import org.raddatz.familienarchiv.dto.PersonUpdateDTO;
 import org.raddatz.familienarchiv.exception.DomainException;
 import org.raddatz.familienarchiv.model.Person;
+import org.raddatz.familienarchiv.model.PersonDisplayNameChangedEvent;
 import org.raddatz.familienarchiv.model.PersonNameAlias;
 import org.raddatz.familienarchiv.model.PersonNameAliasType;
 import org.raddatz.familienarchiv.model.PersonType;
 import org.raddatz.familienarchiv.repository.PersonNameAliasRepository;
 import org.raddatz.familienarchiv.repository.PersonRepository;
+import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.web.server.ResponseStatusException;
 
 import java.util.List;
@@ -31,6 +34,7 @@ class PersonServiceTest {
 
     @Mock PersonRepository personRepository;
     @Mock PersonNameAliasRepository aliasRepository;
+    @Mock ApplicationEventPublisher eventPublisher;
     @InjectMocks PersonService personService;
 
     // ─── getById ─────────────────────────────────────────────────────────────
@@ -242,6 +246,37 @@ class PersonServiceTest {
         assertThat(result.getAlias()).isEqualTo("Anna Alt");
     }
 
+    // ─── updatePerson (display-name change event) ────────────────────────────
+
+    @Test
+    void updatePerson_publishesEvent_whenTitleChanges() {
+        UUID id = UUID.randomUUID();
+        Person existing = Person.builder()
+                .id(id).title("Herr").firstName("Auguste").lastName("Raddatz")
+                .personType(PersonType.PERSON).build();
+        String oldName = existing.getDisplayName();
+
+        when(personRepository.findById(id)).thenReturn(Optional.of(existing));
+        when(personRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        PersonUpdateDTO dto = new PersonUpdateDTO();
+        dto.setPersonType(PersonType.PERSON);
+        dto.setTitle("Frau"); dto.setFirstName("Auguste"); dto.setLastName("Raddatz");
+
+        personService.updatePerson(id, dto);
+
+        ArgumentCaptor<PersonDisplayNameChangedEvent> captor =
+                ArgumentCaptor.forClass(PersonDisplayNameChangedEvent.class);
+        verify(eventPublisher).publishEvent(captor.capture());
+
+        PersonDisplayNameChangedEvent event = captor.getValue();
+        assertThat(event.personId()).isEqualTo(id);
+        assertThat(event.oldDisplayName()).isEqualTo(oldName);
+        assertThat(event.newDisplayName())
+                .isNotEqualTo(oldName)
+                .contains("Frau");
+    }
+
     // ─── findOrCreateByAlias ─────────────────────────────────────────────────
 
     @Test