接收消息时MessageDeliveryException: Dispatcher没有订阅者

问题描述 投票：0回答：1

更新： 将 fromTcp() 从持有者类移动到端点类后，一切都再次正常工作，现在我很困惑为什么它现在还能工作，因为对我来说，它为什么工作没有意义

经过一番头痛并在所有 stackoverflow 中进行搜索后，当我收到来自服务器的消息时，我的调度程序没有订阅者，但当我发送回响应时，一切正常。

连接生成器：

@Service
@EnableIntegration
public class TcpConnectionsHolder {


@Autowired
private IntegrationFlowContext flowContext;


/**
 * Definition of flow channels
 * 
 * @return MessageChannel
 */
@Bean
public MessageChannel fromTcp() {
    final DirectChannel channel = new DirectChannel();
    channel.addInterceptor(new ChannelInterceptorAdapter() {
        @Override
        public Message<?> preSend(final Message<?> message, final MessageChannel channel) {
            // Parse Message byte[] to StringHex
            final byte[] bMessagePayload = (byte[]) message.getPayload();
            return MessageBuilder.withPayload(Hex.encodeHexString(bMessagePayload))
                    .copyHeaders(message.getHeaders()).build();
        }
    });
    return channel;
}

private final LinkedHashMap<String, TcpNetClientConnectionFactory> clientConnect =
        new LinkedHashMap<String, TcpNetClientConnectionFactory>();

private final LinkedHashMap<String, TcpReceivingChannelAdapter> reciverAdapter =
        new LinkedHashMap<String, TcpReceivingChannelAdapter>();

private final LinkedHashMap<String, MessageChannel> sendingAdpater =
        new LinkedHashMap<String, MessageChannel>();

public MessageChannel getMessageChannel(String host, int port) {
    return sendingAdpater.get(host+port);
}


public TcpReceivingChannelAdapter getReceiverChannel(String host, int port) {
    return reciverAdapter.get(host+port);
}

private TcpNetClientConnectionFactory getclientConnectionFactory(String host, int port,int headBytes) {
    
    TcpNetClientConnectionFactory cf = clientConnect.get(host+port);
    if(cf==null) {
        cf = new TcpNetClientConnectionFactory(host, port);
        final ByteArrayLengthHeaderSerializer by = new ByteArrayLengthHeaderSerializer(headBytes);
        cf.setSingleUse(false);
        cf.setSoKeepAlive(true);
        cf.setSerializer(by);
        cf.setDeserializer(by);
        clientConnect.put(host+port,cf);
    }
    return cf;
}
public TcpReceivingChannelAdapter addReceiverChannel(String host, int port) {
    return addReceiverChannel(host,port,2,2000);
}
public TcpReceivingChannelAdapter addReceiverChannel(String host, int port,int headBytes,int retryInterval) {
    TcpReceivingChannelAdapter adapter = new TcpReceivingChannelAdapter();
    TcpNetClientConnectionFactory cf = getclientConnectionFactory(host,port,headBytes);
    adapter.setConnectionFactory(cf);
    adapter.setClientMode(true);
    adapter.setErrorChannelName("errorChannel");
    adapter.setRetryInterval(retryInterval);
    adapter.setOutputChannel(fromTcp());
    
    IntegrationFlow flow = IntegrationFlows.from(adapter).get();
    
    this.flowContext.registration(flow).id(host+port + ".in").addBean(cf).register();
    
    this.reciverAdapter.put(host+port, adapter);
    
    return adapter;
}

public MessageChannel addSendingChannel(String host, int port) {
    return addSendingChannel(host,port,2);
}

public MessageChannel addSendingChannel(String host, int port,int headBytes) {
       TcpSendingMessageHandler sender = new TcpSendingMessageHandler();
       sender.setConnectionFactory(getclientConnectionFactory(host,port,headBytes));
                
        IntegrationFlow flow = f -> f.handle(sender);
        
        IntegrationFlowRegistration flowRegistration =
                this.flowContext.registration(flow).id(host+port + ".out").register();
                
        MessageChannel inputChannel = flowRegistration.getInputChannel();
        this.sendingAdpater.put(host+port, inputChannel);
        return inputChannel;
}

public void removeReceiverChannel(String host, int port) {
    this.reciverAdapter.remove(host+port);
    this.flowContext.remove(host+port + ".in");
}

public void removeSendingChannel(String host, int port) {
    this.sendingAdpater.remove(host+port);
    this.flowContext.remove(host+port + ".out");
}

}

消息端点：

@Configuration
@MessageEndpoint
public class BridgeMessageEndpoint {

private static final Logger LOGGER = LoggerFactory.getLogger(BridgeMessageEndpoint.class);

@Autowired
private ApplicationContext applicationContext;

@ServiceActivator(inputChannel = "fromTcp")
public void outbound(final String inMessage, final @Headers Map<String, Object> headerMap) {
    sendToApi(inMessage, headerMap);
}

private void sendToApi(final String inMessage, final Map<String, Object> headerMap) {
    LOGGER.debug("Recuperando el mensaje Hex {}", inMessage);
    final PaymentOrder paymentOrder = new PaymentOrder();
    paymentOrder.setMessage(inMessage);
    final SplitterRestClient splitterRestClient = applicationContext.getBean(SplitterRestClient.class);
    splitterRestClient.reportPayment(paymentOrder, headerMap);
}

@Bean
@ServiceActivator(inputChannel = "errorChannel")
public MessageHandler logger() {
    final LoggingHandler loggingHandler = new LoggingHandler(LoggingHandler.Level.DEBUG.name());
    loggingHandler.setLoggerName("Log");
    return loggingHandler;
}

@Bean
public IntegrationFlow toTcp() {
    return f -> f.route(new TcpRouter());
}

}

然后持有者发起：

@Component
public class TcpConnectionsController implements CommandLineRunner{

@Autowired
private TcpConnectionsHolder holder;

@Autowired
private ListNodeConfig listNodes;

@Value("${socket.tcp.headBytes}")
private int headBytes;

@Value("${socket.tcp.retryInterval}")
private int retryInterval;

@Override
public void run(String... args) throws Exception {
    
    for(Node node:listNodes.getNodes()) {
        holder.addReceiverChannel(node.getIp(), node.getPort(),headBytes,retryInterval);
        holder.addSendingChannel(node.getIp(), node.getPort(),headBytes);
    }
    
}

}

我知道问题出在 fromTcp() 中，但尽管我搜索了很多，但我无法看到问题或错误所在。

编辑 完整的堆栈跟踪：

[INFO  ] (DefaultLifecycleProcessor.java:343) org.springframework.context.support.DefaultLifecycleProcessor : Starting beans in phase 2147483647
2018/06/22 13:56:47,454 [INFO  ] (DocumentationPluginsBootstrapper.java:151) springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper : Context refreshed
2018/06/22 13:56:47,504 [INFO  ] (DocumentationPluginsBootstrapper.java:154) springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper : Found 1 custom documentation plugin(s)
2018/06/22 13:56:47,555 [INFO  ] (ApiListingReferenceScanner.java:41) springfox.documentation.spring.web.scanners.ApiListingReferenceScanner : Scanning for api listing references
2018/06/22 13:56:47,826 [INFO  ] (DirectJDKLog.java:180) org.apache.coyote.http11.Http11NioProtocol : Initializing ProtocolHandler ["http-nio-8080"]
2018/06/22 13:56:47,827 [INFO  ] (DirectJDKLog.java:180) org.apache.coyote.http11.Http11NioProtocol : Starting ProtocolHandler ["http-nio-8080"]
2018/06/22 13:56:47,829 [INFO  ] (DirectJDKLog.java:180) org.apache.tomcat.util.net.NioSelectorPool : Using a shared selector for servlet write/read
2018/06/22 13:56:47,836 [INFO  ] (TomcatEmbeddedServletContainer.java:201) org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018/06/22 13:56:47,902 [INFO  ] (AbstractConnectionFactory.java:481) org.springframework.integration.ip.tcp.connection.TcpNetClientConnectionFactory : started 180.112.19.1153115.inorg.springframework.integration.ip.tcp.connection.TcpNetClientConnectionFactory#0, host=180.112.19.115, port=3115
2018/06/22 13:56:47,922 [INFO  ] (AbstractEndpoint.java:120) org.springframework.integration.ip.tcp.TcpReceivingChannelAdapter : started org.springframework.integration.ip.tcp.TcpReceivingChannelAdapter#0
2018/06/22 13:56:47,949 [INFO  ] (EventDrivenConsumer.java:108) org.springframework.integration.endpoint.EventDrivenConsumer : Adding {ip:tcp-outbound-channel-adapter} as a subscriber to the '180.112.19.1153115.out.input' channel
2018/06/22 13:56:47,950 [INFO  ] (AbstractSubscribableChannel.java:81) org.springframework.integration.channel.DirectChannel : Channel 'ck-da-bridge:local:8080.180.112.19.1153115.out.input' has 1 subscriber(s).
2018/06/22 13:56:47,950 [INFO  ] (AbstractConnectionFactory.java:481) org.springframework.integration.ip.tcp.connection.TcpNetClientConnectionFactory : started 180.112.19.1153115.inorg.springframework.integration.ip.tcp.connection.TcpNetClientConnectionFactory#0, host=180.112.19.115, port=3115
2018/06/22 13:56:47,950 [INFO  ] (AbstractEndpoint.java:120) org.springframework.integration.endpoint.EventDrivenConsumer : started org.springframework.integration.config.ConsumerEndpointFactoryBean#1
2018/06/22 13:56:47,953 [INFO  ] (StartupInfoLogger.java:57) com.santander.ck.bridge.spring.Application : Started Application in 13.078 seconds (JVM running for 14.159)
2018/06/22 13:57:01,164 [ERROR ] (LoggingHandler.java:192) org.springframework.integration.handler.LoggingHandler : org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'ck-da-bridge:local:8080.180.112.19.1153115.in.channel#0'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers, failedMessage=GenericMessage [payload=f0f8f0f0c2200000800000020400000000000000f0f5f9f9f1f0f3f0f6f2f2f1f3f5f6f5f5f0f0f0f0f1f2f0f6f0f2f2f0f2f0f0f0f9d4c3c3f0f1f1f1e3f0f0f8f2, headers={ip_tcp_remotePort=3115, ip_connectionId=amm000amm.XYZ.ABC.corp:0000:53402:3722e84f-49ce-4e77-a4a1-6e82cefe58b4, ip_localInetAddress=/1192.0.2.1, ip_address=192.0.2.1, id=0000-9faa-a56e-3921-edf7a03a9a3c, ip_hostname=amm000amm.XYZ.ABC.corp, timestamp=1529668621142}], failedMessage=GenericMessage [payload=f0f000022f0f6e3f0f0f8f2, headers={ip_tcp_remotePort=0000, ip_connectionId=amm000amm.scisb.XYZ.corp:0000:53402:3722e84f-49ce-4e77-a4a1-6e82cefe58b4, ip_localInetAddress=/192.0.2.1, ip_address=192.0.2.1, id=0000-9faa-a56e-3921-edf7a03a9a3c, ip_hostname=amm000amm.scisb.isban.corp, timestamp=1529668621142}]
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:93)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:425)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:375)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115)
        at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45)
        at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:105)
        at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:188)
    at org.springframework.integration.ip.tcp.TcpReceivingChannelAdapter.onMessage(TcpReceivingChannelAdapter.java:88)
    at org.springframework.integration.ip.tcp.connection.TcpNetConnection.run(TcpNetConnection.java:182)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers, failedMessage=GenericMessage [payload=f0f8f0f0c2200000800000020400000000000000f0f5f9f9f1f0f3f0f6f2f2f1f3f5f6f5f5f0f0f0f0f1f2f0f6f0f2f2f0f2f0f0f0f9d4c3c3f0f1f1f1e3f0f0f8f2, headers={ip_tcp_remotePort=3115, ip_connectionId=amm000amm.XYZ.ABC.corp:0000:53402:3722e84f-49ce-4e77-a4a1-6e82cefe58b4, ip_localInetAddress=/192.0.2.1, ip_address=192.0.2.1, id=0000-9faa-a56e-3921-edf7a03a9a3c, ip_hostname=amm000amm.XYZ.ABC.corp, timestamp=1529668621142}]
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:154)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:121)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:89)
    ... 11 more
spring-boot spring-integration spring-integration-dsl
1个回答
2
投票

您可以打开 

org.springframework.integration
类别的 DEBUG 日志记录级别并跟踪消息的传输方式。

还有一个“消息历史记录”模式供您跟踪标头中的消息路径。这样您就可以通过Dispatcher has no subscribers看到您的消息通过了哪些渠道以及被卡在哪里。
尽管您需要在每次

MessageHistoryConfigurer

注册后重新启动 

IntegrationFlow
。
请随意就此事提出 JIRA，以便通过消息历史记录来跟踪动态流。

更新

好的。拥有这样的简单代码：

TcpReceivingChannelAdapter adapter = new TcpReceivingChannelAdapter(); TcpNetClientConnectionFactory cf = getclientConnectionFactory(host,port,headBytes); adapter.setConnectionFactory(cf); adapter.setClientMode(true); adapter.setErrorChannelName("errorChannel"); adapter.setRetryInterval(retryInterval); adapter.setOutputChannel(fromTcp()); IntegrationFlow flow = IntegrationFlows.from(adapter).get(); 

事实上，在此之后就没有更多组件了
handler

（adn 堆栈跟踪确实证实了这一点），我假设您使用了一些 Spring Integration Java DSL 版本，而没有经过适当的修复来从提供的 

outputChannel 中提取
MessageProducer.getOutputChannel()
.
要解决这个问题，我建议您修改代码，如下所示：

IntegrationFlow flow = IntegrationFlows.from(adapter).channel(fromTcp()).get(); 

我的意思是将通道引用从
TcpReceivingChannelAdapter

定义移至流程。或者尝试将 

1.2.3
依赖项升级到最新的 
spring-integration-java-dsl
版本！

更新2

对我们迄今为止的代码的另一个想法。

您从

TcpReceivingChannelAdapter

注册 

CommandLineRunner
。这样，
IntegrationFlow
就会自动启动并准备好通过 TCP 接收数据，但同时 
@ServiceActivator(inputChannel = "fromTcp")
尚未启动以消费来自上述通道的消息。这就是你得到的方式
Dispatcher has no subscribers
。或者您应该用 
this.flowContext.registration(flow)
标记您的 
autoStartup(false)
并让它在正常自动启动阶段稍后启动，已经与服务激活器一起启动。或者您不应该使用 
CommandLineRunner
方法来实现这样的逻辑：从那里开始某些活动确实为时过早。

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