我是Rabbitmq的新手,目前正尝试使用非阻塞消费者实现一个非阻塞生产者。我已经建立了一些测试生产者,并在其中使用了typereference:
@Service
public class Producer {
@Autowired
private AsyncRabbitTemplate asyncRabbitTemplate;
public <T extends RequestEvent<S>, S> RabbitConverterFuture<S> asyncSendEventAndReceive(final T event) {
return asyncRabbitTemplate.convertSendAndReceiveAsType(QueueConfig.EXCHANGE_NAME, event.getRoutingKey(), event, event.getResponseTypeReference());
}
}
在其他地方,在RestController中调用的测试函数
@Autowired
Producer producer;
public void test() throws InterruptedException, ExecutionException {
TestEvent requestEvent = new TestEvent("SOMEDATA");
RabbitConverterFuture<TestResponse> reply = producer.asyncSendEventAndReceive(requestEvent);
log.info("Hello! The Reply is: {}", reply.get());
}
到目前为止,这非常简单,我现在遇到的问题是如何创建也不会阻塞的使用者。我目前的听众:
@RabbitListener(queues = QueueConfig.QUEUENAME)
public TestResponse onReceive(TestEvent event) {
Future<TestResponse> replyLater = proccessDataLater(event.getSomeData())
return replyLater.get();
}
据我所知,使用@RabbitListener时,此侦听器在其自己的线程中运行。而且我可以将MessageListener配置为对活动的侦听器使用不止一个线程。因此,使用future.get()阻止侦听器线程不会阻止应用程序本身。仍然有可能所有线程现在都处于阻塞状态,而新事件可能不需要时就卡在了队列中。我想做的就是只接收事件,而无需立即返回结果。 @RabbitListener可能无法实现。像这样:
@RabbitListener(queues = QueueConfig.QUEUENAME)
public void onReceive(TestEvent event) {
/*
* Some fictional RabbitMQ API call where i get a ReplyContainer which contains
* the CorrelationID for the event. I can call replyContainer.reply(testResponse) later
* in the code without blocking the listener thread
*/
ReplyContainer replyContainer = AsyncRabbitTemplate.getReplyContainer()
// ProcessDataLater calls reply on the container when done with its action
proccessDataLater(event.getSomeData(), replyContainer);
}
在春季用Rabbitmq实现这种行为的最佳方法是什么?
EDIT配置类:
@Configuration
@EnableRabbit
public class RabbitMQConfig implements RabbitListenerConfigurer {
public static final String topicExchangeName = "exchange";
@Bean
TopicExchange exchange() {
return new TopicExchange(topicExchangeName);
}
@Bean
public ConnectionFactory rabbitConnectionFactory() {
CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
connectionFactory.setHost("localhost");
return connectionFactory;
}
@Bean
public MappingJackson2MessageConverter consumerJackson2MessageConverter() {
return new MappingJackson2MessageConverter();
}
@Bean
public RabbitTemplate rabbitTemplate() {
final RabbitTemplate rabbitTemplate = new RabbitTemplate(rabbitConnectionFactory());
rabbitTemplate.setMessageConverter(producerJackson2MessageConverter());
return rabbitTemplate;
}
@Bean
public AsyncRabbitTemplate asyncRabbitTemplate() {
return new AsyncRabbitTemplate(rabbitTemplate());
}
@Bean
public Jackson2JsonMessageConverter producerJackson2MessageConverter() {
return new Jackson2JsonMessageConverter();
}
@Bean
Queue queue() {
return new Queue("test", false);
}
@Bean
Binding binding() {
return BindingBuilder.bind(queue()).to(exchange()).with("foo.#");
}
@Bean
public SimpleRabbitListenerContainerFactory myRabbitListenerContainerFactory() {
SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
factory.setConnectionFactory(rabbitConnectionFactory());
factory.setMaxConcurrentConsumers(5);
factory.setMessageConverter(producerJackson2MessageConverter());
factory.setAcknowledgeMode(AcknowledgeMode.MANUAL);
return factory;
}
@Override
public void configureRabbitListeners(final RabbitListenerEndpointRegistrar registrar) {
registrar.setContainerFactory(myRabbitListenerContainerFactory());
}
}
答案 0 :(得分:2)
我现在没有时间对其进行测试,但是这样的事情应该可以工作。大概您不想丢失消息,因此需要将ackMode设置为MANUAL并自己进行确认(如图所示)。
更新
@SpringBootApplication
public class So52173111Application {
private final ExecutorService exec = Executors.newCachedThreadPool();
@Autowired
private RabbitTemplate template;
@Bean
public ApplicationRunner runner(AsyncRabbitTemplate asyncTemplate) {
return args -> {
RabbitConverterFuture<Object> future = asyncTemplate.convertSendAndReceive("foo", "test");
future.addCallback(r -> {
System.out.println("Reply: " + r);
}, t -> {
t.printStackTrace();
});
};
}
@Bean
public AsyncRabbitTemplate asyncTemplate(RabbitTemplate template) {
return new AsyncRabbitTemplate(template);
}
@RabbitListener(queues = "foo")
public void listen(String in, Channel channel, @Header(AmqpHeaders.DELIVERY_TAG) long tag,
@Header(AmqpHeaders.CORRELATION_ID) String correlationId,
@Header(AmqpHeaders.REPLY_TO) String replyTo) {
ListenableFuture<String> future = handleInput(in);
future.addCallback(result -> {
Address address = new Address(replyTo);
this.template.convertAndSend(address.getExchangeName(), address.getRoutingKey(), result, m -> {
m.getMessageProperties().setCorrelationId(correlationId);
return m;
});
try {
channel.basicAck(tag, false);
}
catch (IOException e) {
e.printStackTrace();
}
}, t -> {
t.printStackTrace();
});
}
private ListenableFuture<String> handleInput(String in) {
SettableListenableFuture<String> future = new SettableListenableFuture<String>();
exec.execute(() -> {
try {
Thread.sleep(2000);
}
catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
future.set(in.toUpperCase());
});
return future;
}
public static void main(String[] args) {
SpringApplication.run(So52173111Application.class, args);
}
}