Spring集成tcp客户端多连接

我使用Spring集成tcp出站适配器和tcp入站适配器，以便通过tcp与第三方外部系统通信

我使用的连接工厂类型为“client”，具有single use=“false”，因为与外部系统通信的本质是一个包含几十个请求和响应的会话。 外部系统希望我为每个会话打开一个新的TCP连接

使用Spring集成有什么方法可以做到这一点吗

我的代码成功地将SI用于一个这样的会话。但是我希望我的系统打开几个这样的连接，这样我就可以处理几个并发会话。 当前，如果我向入站适配器发送新会话的消息，它将使用相同的TCP连接

请帮忙

更新：

在这里使用Gary提供的ThreadAffinity解决方案时，当我们执行4个以上的并发请求时，会出现此异常。知道为什么吗

11:08:02.083  [pool-1-thread-2] 193.xxx.yyy.zz:443:55729:46c71372-5933-4707-a27b-93cc4bf78c59 Message sent GenericMessage [payload=byte[326], headers={replyChannel=org.springframework.messaging.core.GenericMessagingTemplate$TemporaryReplyChannel@2fb866, errorChannel=org.springframework.messaging.core.GenericMessagingTemplate$TemporaryReplyChannel@2fb866, ip_tcp_remotePort=55718, ip_connectionId=127.0.0.1:55718:4444:7f71ce96-eaac-4b21-8b2c-bf736102f818, ip_localInetAddress=/127.0.0.1, ip_address=127.0.0.1, id=2dc3e330-d703-8a61-c46c-012233cadf6f, ip_hostname=127.0.0.1, timestamp=1481706480700}]
11:08:12.093  [pool-1-thread-2] Remote Timeout on 193.xxx.yyy.zz:443:55729:46c71372-5933-4707-a27b-93cc4bf78c59
11:08:12.093  [pool-1-thread-2] Tcp Gateway exception
org.springframework.integration.MessageTimeoutException: Timed out waiting for response
            at org.springframework.integration.ip.tcp.TcpOutboundGateway.handleRequestMessage(TcpOutboundGateway.java:146)
            at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:109)
            at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127)
            at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
            at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148)
            at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:121)
            at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
            at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:423)
            at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:373)
            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.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:292)
            at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:212)
            at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:129)
            at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:115)
            at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127)
            at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
            at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148)
            at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:121)
            at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
            at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:423)
            at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115)
            at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:150)
            at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:45)
            at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive(AbstractMessagingTemplate.java:42)
            at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:97)
            at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive(MessagingGatewaySupport.java:441)
            at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceiveMessage(MessagingGatewaySupport.java:409)
            at org.springframework.integration.ip.tcp.TcpInboundGateway.doOnMessage(TcpInboundGateway.java:120)
            at org.springframework.integration.ip.tcp.TcpInboundGateway.onMessage(TcpInboundGateway.java:98)
            at org.springframework.integration.ip.tcp.connection.TcpConnectionInterceptorSupport.onMessage(TcpConnectionInterceptorSupport.java:159)
            at org.springframework.integration.ip.tcp.connection.TcpNetConnection.run(TcpNetConnection.java:182)
            at org.springframework.integration.ip.tcp.connection.TcpConnectionInterceptorSupport.run(TcpConnectionInterceptorSupport.java:111)
            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)

---

这取决于“会话”的构成——如果来自客户端会话的所有请求都在单个线程上运行，那么您可以为连接工厂编写一个简单的包装器，将连接存储在

ThreadLocal

中。在最后一次请求关闭连接并将其从

ThreadLocal

中删除后，您需要一些机制来调用工厂包装器

如果会话请求可以发生在多个线程上，则会有点复杂，但您仍然可以使用映射到连接实例的

ThreadLocal

编辑

这里有一个例子

@SpringBootApplication
public class So40507731Application {

    public static void main(String[] args) throws Exception {
        ConfigurableApplicationContext context = SpringApplication.run(So40507731Application.class, args);
        MessageChannel channel = context.getBean("clientFlow.input", MessageChannel.class);
        MessagingTemplate template = new MessagingTemplate(channel);
        ThreadAffinityClientConnectionFactory affinityCF = context.getBean(ThreadAffinityClientConnectionFactory.class);
        ExecutorService exec = Executors.newCachedThreadPool();
        CountDownLatch latch = new CountDownLatch(2);
        exec.execute(() -> {
            String result = new String(template.convertSendAndReceive("foo", byte[].class));
            System.out.println(Thread.currentThread().getName() + " " + result);
            result = new String(template.convertSendAndReceive("foo", byte[].class));
            System.out.println(Thread.currentThread().getName() + " " + result);
            affinityCF.release();
            latch.countDown();
        });
        exec.execute(() -> {
            String result = new String(template.convertSendAndReceive("foo", byte[].class));
            System.out.println(Thread.currentThread().getName() + " " + result);
            result = new String(template.convertSendAndReceive("foo", byte[].class));
            System.out.println(Thread.currentThread().getName() + " " + result);
            affinityCF.release();
            latch.countDown();
        });
        latch.await(10, TimeUnit.SECONDS);
        context.close();
        exec.shutdownNow();
    }

    @Bean
    public TcpNetClientConnectionFactory delegateCF() {
        TcpNetClientConnectionFactory clientCF = new TcpNetClientConnectionFactory("localhost", 1234);
        clientCF.setSingleUse(true); // so each thread gets his own connection
        return clientCF;
    }

    @Bean
    public ThreadAffinityClientConnectionFactory affinityCF() {
        return new ThreadAffinityClientConnectionFactory(delegateCF());
    }

    @Bean
    public TcpOutboundGateway outGate() {
        TcpOutboundGateway outGate = new TcpOutboundGateway();
        outGate.setConnectionFactory(affinityCF());
        return outGate;
    }

    @Bean
    public IntegrationFlow clientFlow() {
        return f -> f.handle(outGate());
    }

    @Bean
    public TcpNetServerConnectionFactory serverCF() {
        return new TcpNetServerConnectionFactory(1234);
    }

    @Bean
    public TcpInboundGateway inGate() {
        TcpInboundGateway inGate = new TcpInboundGateway();
        inGate.setConnectionFactory(serverCF());
        return inGate;
    }

    @Bean
    public IntegrationFlow serverFlow() {
        return IntegrationFlows.from(inGate())
                .transform(Transformers.objectToString())
                .transform("headers['ip_connectionId'] + ' ' + payload")
                .get();
    }

    public static class ThreadAffinityClientConnectionFactory extends AbstractClientConnectionFactory
            implements TcpListener {

        private final AbstractClientConnectionFactory delegate;

        private final ThreadLocal<TcpConnectionSupport> connection = new ThreadLocal<>();

        public ThreadAffinityClientConnectionFactory(AbstractClientConnectionFactory delegate) {
            super("", 0);
            delegate.registerListener(this);
            this.delegate = delegate;
        }

        @Override
        protected TcpConnectionSupport obtainConnection() throws Exception {
            TcpConnectionSupport tcpConnection = this.connection.get();
            if (tcpConnection == null || !tcpConnection.isOpen()) {
                tcpConnection = this.delegate.getConnection();
                this.connection.set(tcpConnection);
            }
            return tcpConnection;
        }

        public void release() {
            TcpConnectionSupport connection = this.connection.get();
            if (connection != null) {
                connection.close();
                this.connection.remove();
            }
        }

        @Override
        public void start() {
            this.delegate.start();
            setActive(true);
            super.start();
        }

        @Override
        public void stop() {
            this.delegate.stop();
            setActive(false);
            super.stop();
        }

        @Override
        public boolean onMessage(Message<?> message) {
            return getListener().onMessage(message);
        }

    }

}

---

谢谢你的快速回答。这不是一个常规用例，在SI中已经准备好了解决方案吗？我假设包装器将类似于CachingClientConnectionFactory？但是我如何配置int-ip:tcp连接工厂来返回包装器类呢？请您提供更详细的建议？我尝试过几种可能性，但没有一种可行。似乎在许多类中都可以找到拥有一个共享连接的逻辑（在singleUse=“false”的情况下）。TIA需要任何帮助。它以前从未被要求过；我开了一家商店。它将使用与缓存CF类似的技术，但复杂度要低得多，因为它只是委托，不必包装连接本身。我编辑了我的答案。谢谢你的代码示例。这很有帮助。但是，您使用的是singleUse=true，我的用例则不同：我有几个tcp客户机（在同一JVM中），它们都连接到同一个tcp服务器（一个外部系统），每个客户机上都有一个包含20-150条双向消息的“对话”。所以我必须使用singleUse=false和2通道适配器。我扩展了您的代码示例，但不得不将ConnectionFactoryBean复制粘贴到我自己的代码中，以便创建我自己的ConnectionFactory，因为它的一些方法无法扩展。

pool-2-thread-2 localhost:64559:1234:3d898822-ea91-421d-97f2-5f9620b9d369 foo
pool-2-thread-1 localhost:64560:1234:227f8a9f-1461-41bf-943c-68a56f708b0c foo
pool-2-thread-2 localhost:64559:1234:3d898822-ea91-421d-97f2-5f9620b9d369 foo
pool-2-thread-1 localhost:64560:1234:227f8a9f-1461-41bf-943c-68a56f708b0c foo