# 능력 성분의 아홉째 자리
33:    boolean brokerTransaction,
#   Kafka 가 넘기는 열두 값 (아홉째가 참)
      new MessagingCapabilities(
          true, true, true, true, true, true, true, false, true, false, false, true);
                                                           ^^^^ brokerTransaction
#   그 상수 선언이 프로파일을 참조하는가: 0
#   이 플래그를 읽는 main 코드: 0
#   바로 옆 열째 플래그를 읽는 main 코드: DefaultMessagePublisher.java:250:        && !transport.capabilities(profile.name()).capabilities().deduplicatedPublish()) {
#   그 열째가 거짓인 이유
   * <p>Declaring it true means {@code PublishDeduplication} is accepted and silently does nothing —
   * the caller believes the broker is deduplicating and skips the idempotency it would otherwise
   * build. False makes that request a startup failure instead, which is the whole reason the flag
   * exists.

# 트랜잭션 검증기가 요구하는 다섯
30:    if (transactionalIdPrefix == null || transactionalIdPrefix.isBlank()) {
34:    if (!brokerProfile.enableIdempotence()) {
38:    if (!"all".equals(brokerProfile.acks())) {
42:    if (brokerProfile.enableAutoCommit()) {
46:    if (profile.externalSideEffectGuarantee() == ExternalSideEffectGuarantee.INBOX_TRANSACTIONAL) {
    if (profile.externalSideEffectGuarantee() == ExternalSideEffectGuarantee.INBOX_TRANSACTIONAL) {
      throw new IllegalArgumentException(
          "a Kafka transaction does not cover a database side effect; use the Inbox alone: "
              + profile.name().value());
    }
  }
}

# 기동 검증으로 감싸이는 검증기와 직접 불리는 검증기
KafkaMessagingAutoConfiguration.java:54:  public StartupProfileValidation<dev.caskeleton.messaging.kafka.KafkaBrokerProfile>
MessagingCoreAutoConfiguration.java:216:  public StartupProfileValidation<dev.caskeleton.messaging.security.BrokerSecurityProfile>
RabbitMessagingAutoConfiguration.java:48:  public StartupProfileValidation<dev.caskeleton.messaging.rabbit.RabbitBrokerProfile>
134:    new DestinationProfileValidator().validateAll(registered);
#   그런데 트랜잭션 검증기는 그냥 빈이다
  @Bean
  @ConditionalOnMissingBean
  public KafkaTransactionProfileValidator kafkaTransactionProfileValidator() {
    return new KafkaTransactionProfileValidator();
  }

#   자동설정 밖에서 그것을 언급하는 main 코드: 0
#   그것을 만드는 test 코드: 0

# 감쌀 수 없는 이유는 인자 수가 아니다
  private final Consumer<T> validator;

  StartupProfileValidation(Supplier<List<T>> profiles, Consumer<T> validator) {
    this.profiles = Objects.requireNonNull(profiles, "profiles must not be null");
    this.validator = Objects.requireNonNull(validator, "validator must not be null");
  }
#   두 번째 인자의 출처 — transactionalIdPrefix 가 나오는 곳: KafkaTransactionProfileValidator.java:21:   * @param transactionalIdPrefix the configured transactional id prefix
KafkaTransactionProfileValidator.java:26:      DestinationProfile profile, String transactionalIdPrefix, KafkaBrokerProfile brokerProfile) {
KafkaTransactionProfileValidator.java:30:    if (transactionalIdPrefix == null || transactionalIdPrefix.isBlank()) {