[SELC-7589] Attempt to resolve the mysterious PDV conflict with retry

Author: gaetano-miglionico

apps/user-ms/src/main/java/it/pagopa/selfcare/user/service/UserServiceImpl.java

@@ -454,6 +454,7 @@ private Uni<CreateOrUpdateUserByFiscalCodeResponse> createUserOnUserRegistryAndU
         Map<String, WorkContactResource> workContacts = new HashMap<>();
         workContacts.put(mailUuid, UserUtils.buildWorkContact(userDto.getUser().getInstitutionEmail()));
         return userRegistryService.saveUsingPATCH(userMapper.toSaveUserDto(userDto.getUser(), workContacts))
+            .onFailure(UserUtils::isConflictOnUserRegistry).retry().withBackOff(Duration.ofSeconds(2)).atMost(3)
             .onFailure().invoke(exception -> log.error("Error during create user on userRegistry: {} ", exception.getMessage(), exception))
             .onItem().invoke(userResource -> log.info("User created with id {}", userResource.getId()))
             .onItem().transform(userResource -> userResource.getId().toString())

apps/user-ms/src/main/java/it/pagopa/selfcare/user/util/UserUtils.java

@@ -142,6 +142,10 @@ public static boolean isUserNotFoundExceptionOnUserRegistry(Throwable fail) {
         return fail instanceof WebApplicationException webApplicationException && webApplicationException.getResponse().getStatus() == HttpStatus.SC_NOT_FOUND;
     }
 
+    public static boolean isConflictOnUserRegistry(Throwable fail) {
+        return fail instanceof WebApplicationException webApplicationException && webApplicationException.getResponse().getStatus() == HttpStatus.SC_CONFLICT;
+    }
+
     public Optional<String> getMailUuidFromMail(Map<String, WorkContactResource> workContacts, String email) {
         if(Objects.isNull(workContacts) || workContacts.isEmpty()) return Optional.empty();