Constructor Detail

• SpringBootConfig()

Method Detail

• @Bean
  TransactionManager axonTransactionManager(PlatformTransactionManager transactionManager)

  Creates Axon's read-only SpringTransactionManager.

  Axon does not use

  Transactional:

  annotations for determining transactional attributes of its message handling methods. By default it uses vanilla DefaultTransactionDefinition. This is unfortunate since we do not have a way for specifying transaction attributes on a level of message handling method. However, since we are running standalone queryside application, we can set read-only attribute for all transactions created by Axon's transaction manager. This is exactly what this bean does.

  Read-only attribute reduces consumption of memory on hibernate level (https://vladmihalcea.com/spring-read-only-transaction-hibernate-optimization/) and reduces some latency and required resources on database level since creation of real transaction IDs is not necessary. The following link explains this better for MySQL under section 'What is a transaction?' - https://www.percona.com/blog/2019/07/15/mysql-the-impact-of-transactions-on-query-throughput/ .

• @Bean
  static BeanPostProcessor dataSourceProxyBeanPostProcessor(ObjectProvider<DataSourceProxyConfigurationProperties> dataSourceProxyConfigurationPropertiesObjectProvider)

• @Bean
  static EssentialJacksonCustomizer essentialJacksonCustomizer(ObjectProvider<EssentialJacksonCustomizerConfigurationProperties> essentialJacksonCustomizerConfigurationPropertiesObjectProvider)

• @Bean
  InMemoryCustomerRegistryService inMemoryCustomerRegistryService()

• @Bean
  HandlerEnhancerDefinition loggingQueryHandlerEnhancerDefinition()

• @Bean
  QueryHandlerExceptionInterceptor queryHandlerExceptionInterceptor()

• @SuppressWarnings(value: SpringJavaInjectionPointsAutowiringInspection)
  @Bean
  ValidationService validationService(ValidationConfigurationProperties validationConfigurationProperties)