JpaConfiguration

激活条件

JpaConfiguration 激活的条件是存在 CommandBus 是 EntityManagerFactory 的bean：

@ConditionalOnBean(EntityManagerFactory.class)
@RegisterDefaultEntities(packages = {"org.axonframework.eventsourcing.eventstore.jpa",
        "org.axonframework.eventhandling.tokenstore",
        "org.axonframework.eventhandling.saga.repository.jpa"})
@Configuration
public static class JpaConfiguration {
......
}

自动配置的内容

EventStorageEngine

自动配置的 EventStorageEngine 是 JpaEventStorageEngine：

@ConditionalOnMissingBean
@Bean
public EventStorageEngine eventStorageEngine(Serializer serializer,
    PersistenceExceptionResolver persistenceExceptionResolver,
    AxonConfiguration configuration,
    EntityManagerProvider entityManagerProvider,
    TransactionManager transactionManager) {
    return new JpaEventStorageEngine(serializer, configuration.getComponent(EventUpcaster.class), persistenceExceptionResolver, null, entityManagerProvider, transactionManager, null, null, true);
}

SagaStore

自动配置的 SagaStore 是 JpaSagaStore：

@ConditionalOnMissingBean(SagaStore.class)
@Bean
public JpaSagaStore sagaStore(Serializer serializer, EntityManagerProvider entityManagerProvider) {
    return new JpaSagaStore(serializer, entityManagerProvider);
}