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Commitfac02e5

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Step 10. Send messages to Kafka
1 parent743892d commitfac02e5

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4 files changed

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4 files changed

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packageorg.springframework.samples.petclinic.owner;
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importjakarta.validation.constraints.NotBlank;
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importjava.io.Serializable;
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importjava.time.LocalDate;
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/**
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* DTO for {@link Visit}
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*/
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publicrecordVisitDto(Integerid,LocalDatedate,@NotBlankStringdescription,
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IntegervetId)implementsSerializable {
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}
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packageorg.springframework.samples.petclinic.owner;
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importorg.mapstruct.Mapper;
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importorg.mapstruct.Mapping;
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importorg.mapstruct.MappingConstants;
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importorg.mapstruct.ReportingPolicy;
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@Mapper(unmappedTargetPolicy =ReportingPolicy.IGNORE,componentModel =MappingConstants.ComponentModel.SPRING)
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publicinterfaceVisitMapper {
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@Mapping(source ="vet.id",target ="vetId")
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VisitDtotoDto(Visitvisit);
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}

‎existing-spring-boot-app-modification/spring-petclinic-main/src/main/java/org/springframework/samples/petclinic/system/KafkaConfiguration.java‎

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importorg.springframework.kafka.core.DefaultKafkaConsumerFactory;
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importorg.springframework.kafka.core.DefaultKafkaProducerFactory;
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importorg.springframework.kafka.core.KafkaTemplate;
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importorg.springframework.kafka.support.serializer.JsonSerializer;
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importorg.springframework.samples.petclinic.owner.VisitDto;
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importjava.util.Map;
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@@ -47,4 +49,17 @@ public KafkaListenerContainerFactory<?> stringListenerFactory(ConsumerFactory<St
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factory.setBatchListener(false);
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returnfactory;
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}
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@Bean
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DefaultKafkaProducerFactory<String,VisitDto>visitDtoProducerFactory(KafkaPropertiesproperties) {
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Map<String,Object>producerProperties =properties.buildProducerProperties();
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producerProperties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,StringSerializer.class);
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producerProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,JsonSerializer.class);
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returnnewDefaultKafkaProducerFactory<>(producerProperties);
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}
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@Bean
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KafkaTemplate<String,VisitDto>visitDtoKafkaTemplate(DefaultKafkaProducerFactory<String,VisitDto>visitDtoProducerFactory) {
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returnnewKafkaTemplate<>(visitDtoProducerFactory);
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}
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}
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packageorg.springframework.samples.petclinic.vet;
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importjakarta.annotation.PostConstruct;
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importjakarta.persistence.EntityManagerFactory;
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importorg.hibernate.engine.spi.SessionFactoryImplementor;
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importorg.hibernate.event.service.spi.EventListenerRegistry;
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importorg.hibernate.event.spi.*;
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importorg.hibernate.persister.entity.EntityPersister;
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importorg.springframework.kafka.core.KafkaTemplate;
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importorg.springframework.samples.petclinic.owner.Visit;
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importorg.springframework.samples.petclinic.owner.VisitDto;
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importorg.springframework.samples.petclinic.owner.VisitMapper;
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importorg.springframework.stereotype.Component;
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@Component
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publicclassVisitHibernateEventListenerimplementsPostDeleteEventListener,PostInsertEventListener,PostUpdateEventListener {
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privatefinalEntityManagerFactoryentityManagerFactory;
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privatefinalVisitMappervisitMapper;
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privatefinalKafkaTemplate<String,VisitDto>kafkaTemplate;
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publicVisitHibernateEventListener(EntityManagerFactoryentityManagerFactory,
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VisitMappervisitMapper,
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KafkaTemplate<String,VisitDto>kafkaTemplate) {
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this.entityManagerFactory =entityManagerFactory;
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this.visitMapper =visitMapper;
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this.kafkaTemplate =kafkaTemplate;
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}
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@Override
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publicvoidonPostDelete(PostDeleteEventpostDeleteEvent) {
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Objectentity =postDeleteEvent.getEntity();
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if (entityinstanceofVisitvisit) {
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kafkaTemplate.send("visit",visitMapper.toDto(visit));
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}
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}
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@Override
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publicvoidonPostInsert(PostInsertEventpostInsertEvent) {
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Objectentity =postInsertEvent.getEntity();
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if (entityinstanceofVisitvisit) {
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kafkaTemplate.send("visit",visitMapper.toDto(visit));
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}
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}
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@Override
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publicvoidonPostUpdate(PostUpdateEventpostUpdateEvent) {
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Objectentity =postUpdateEvent.getEntity();
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if (entityinstanceofVisitvisit) {
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kafkaTemplate.send("visit",visitMapper.toDto(visit));
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}
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}
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@Override
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publicbooleanrequiresPostCommitHandling(EntityPersisterentityPersister) {
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returntrue;
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}
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@PostConstruct
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privatevoidpostConstruct() {
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SessionFactoryImplementorsessionFactory =entityManagerFactory.unwrap(SessionFactoryImplementor.class);
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EventListenerRegistryregistry =sessionFactory
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.getServiceRegistry()
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.getService(EventListenerRegistry.class);
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assertregistry !=null;
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registry.prependListeners(EventType.POST_COMMIT_DELETE,this);
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registry.prependListeners(EventType.POST_COMMIT_INSERT,this);
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registry.prependListeners(EventType.POST_COMMIT_UPDATE,this);
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}
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}

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