我正在尝试基于@JmsListener注释为发布 - 订阅创建示例:https://github.com/lkrnac/book-eiws-code-samples/tree/master/05-jms/0515-publish-subscribe
相关代码段:
@Slf4j
@SpringBootApplication
@EnableScheduling
public class JmsPublishSubscribeApplication {
public static void main(String[] args) throws InterruptedException {
SpringApplication.run(JmsPublishSubscribeApplication.class, args);
}
@Bean
public ActiveMQTopic simpleTopic() {
return new ActiveMQTopic("simpleTopic");
}
}
@Component
public class SimpleMessageListener1 {
@JmsListener(destination = "simpleTopic")
public void readMessage(String message) {
//....
}
}
@Component
public class SimpleMessageListener2 {
@JmsListener(destination = "simpleTopic")
public void readMessage(String message) {
//....
}
}
问题是得到这种行为:
2015-05-17 20:07:04.985 INFO 22983 --- [pool-1-thread-1] n.l.b.e.chapter05.SimpleMessageSender : Sending message: simple message
2015-05-17 20:07:05.070 INFO 22983 --- [enerContainer-1] n.l.b.e.c.JmsPublishSubscribeApplication : Message Received: simple message via listener 2
2015-05-17 20:07:05.975 INFO 22983 --- [pool-1-thread-1] n.l.b.e.chapter05.SimpleMessageSender : Sending message: simple message
2015-05-17 20:07:05.986 INFO 22983 --- [enerContainer-1] n.l.b.e.c.JmsPublishSubscribeApplication : Message Received: simple message via listener 1
2015-05-17 20:07:06.975 INFO 22983 --- [pool-1-thread-1] n.l.b.e.chapter05.SimpleMessageSender : Sending message: simple message
2015-05-17 20:07:06.987 INFO 22983 --- [enerContainer-1] n.l.b.e.c.JmsPublishSubscribeApplication : Message Received: simple message via listener 2
2015-05-17 20:07:07.975 INFO 22983 --- [pool-1-thread-1] n.l.b.e.chapter05.SimpleMessageSender : Sending message: simple message
2015-05-17 20:07:07.994 INFO 22983 --- [enerContainer-1] n.l.b.e.c.JmsPublishSubscribeApplication : Message Received: simple message via listener 1
但是每个消息都应该由两个侦听器根据主题的定义来使用。我错过了什么?
答案 0 :(得分:23)
使用@JmsListener
时,它使用的DefaultMessageListenerContainer
扩展JmsDestinationAccessor
,默认情况下pubSubDomain
设置为false
。当此属性为false时,它将在队列上运行。如果要使用主题,则必须将此属性值设置为true
。
当您使用Spring Boot时,您可以通过将spring.jms.pub-sub-domain
属性添加到application.properties
并将其设置为true
来轻松地将此属性设置为true。
spring.jms.pub-sub-domain=true
当使用@JmsListener
时,它正在寻找一个jmsListenerContainerFactory
命名bean,如果没有,则需要默认值。您还可以包含自己的bean,并以编程方式将此属性设置为true
。
@Bean
public DefaultMessageListenerContainer jmsListenerContainerFactory() {
DefaultMessageListenerContainer dmlc = new DefaultMessageListenerContainer();
dmlc.setPubSubDomain(true);
// Other configuration here
return dmlc;
}
这当然也有效,但会有更多工作,有关这方面的更多信息可以在@EnableJms
annotation的文档中找到。
答案 1 :(得分:5)
将@JmsListener
的默认目标类型从Queue
切换到Topic
可以在Java中完全完成,无需修改属性或使用XML。
Spring guide包含自定义DefaultMessageListenerContainer
提供的默认设置的示例。
它需要定义一个自定义bean,如下所示:
@Bean
public JmsListenerContainerFactory<?> myFactory(ConnectionFactory connectionFactory,
DefaultJmsListenerContainerFactoryConfigurer configurer) {
DefaultJmsListenerContainerFactory factory = new DefaultJmsListenerContainerFactory();
// This provides all boot's default to this factory, including the message converter
configurer.configure(factory, connectionFactory);
// You could still override some of Boot's default if necessary.
factory.setPubSubDomain(true);
return factory;
}
然后可以在@JmsListener
带注释的方法中使用它:
@JmsListener(destination = "mailbox", containerFactory = "myFactory")
public void receiveMessage(Email email) {
// implementation
}