我有一个接口(interface)Channels.java
final String OUTPUT = "output";
final String INPUT = "input";
@Output(OUTPUT)
MessageChannel output();
@BridgeFrom(OUTPUT)
PollableChannel input();
我有另一个类,我在其中执行所有消息传递操作:
@Autowired
@Qualifier(Channels.OUTPUT)
private MessageChannel Output;
我能够很好地向交易所发送消息。如何在这里使用我的 PollableChannel ?我做错了什么?
编辑
如何访问 @Component 类中的 bean?
我现在有@Configuration类
@Bean
@BridgeTo(Channels.OUTPUT)
public PollableChannel polled() {
return new QueueChannel();
}
想要能够使用此 channel 接收消息吗?
最佳答案
桥必须是一个@Bean
,而不是接口(interface)方法上的注释 - 请参阅 the answer to your general question here .
编辑
@SpringBootApplication
@EnableBinding(Source.class)
public class So44018382Application implements CommandLineRunner {
final Logger logger = LoggerFactory.getLogger(getClass());
public static void main(String[] args) throws Exception {
ConfigurableApplicationContext context = SpringApplication.run(So44018382Application.class, args);
Thread.sleep(60_000);
context.close();
}
@RabbitListener(bindings =
@QueueBinding(value = @Queue(value = "foo", autoDelete = "true"),
exchange = @Exchange(value = "output", type = "topic"), key = "#"))
// bind a queue to the output exchange
public void listen(String in) {
this.logger.info("received " + in);
}
@BridgeTo(value = Source.OUTPUT,
poller = @Poller(fixedDelay = "5000", maxMessagesPerPoll = "2"))
@Bean
public PollableChannel polled() {
return new QueueChannel(5);
}
@Override
public void run(String... args) throws Exception {
for (int i = 0; i < 30; i++) {
polled().send(new GenericMessage<>("foo" + i));
this.logger.info("sent foo" + i);
}
}
}
这对我来说效果很好;队列深度为5;当它已满时,发送者会阻塞;轮询器一次仅删除 2 条消息并将它们发送到输出 channel 。
此示例还添加了一个兔子监听器来消耗发送到绑定(bind)器的消息。
关于java - 与 Spring 集成的 PollableChannel,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44018382/