spring tcp inbound-outbound channel adapter example

Example 1: spring tcp inbound-outbound channel adapter example

@SpringBootApplication
@IntegrationComponentScan
@EnableMessageHistory
public class SpringIntegrationTcpTest {

    @Autowired
    private ServerConfiguration.Gateway gateway;

    public String send(String data) {
        return gateway.send(data);
    }


public static void main(String[] args) throws IOException {

    ConfigurableApplicationContext context = SpringApplication.run(SpringIntegrationTcpTest.class, args);

    SpringIntegrationTcpTest si = context.getBean(SpringIntegrationTcpTest.class);

    final AbstractServerConnectionFactory crLfServer = context.getBean(AbstractServerConnectionFactory.class);

    final Scanner scanner = new Scanner(System.in);
    System.out.print("Waiting for server to accept connections on port " + crLfServer.getPort());
    TestingUtilities.waitListening(crLfServer, 100000L);
    System.out.println("running.\n\n");

    System.out.println("Please enter some text and press <enter>: ");
    System.out.println("\tNote:");
    System.out.println("\t- Entering FAIL will create an exception");
    System.out.println("\t- Entering q will quit the application");
    System.out.print("\n");

    while (true) {

        final String input = scanner.nextLine();

        if("q".equals(input.trim())) {
            break;
        }
        else {
            final String result = si.send(input);
            System.out.println(result);
        }
    }

    scanner.close();
    context.close();
}
}

Example 2: spring tcp inbound-outbound channel adapter example

@Configuration()
@EnableIntegration
@IntegrationComponentScan
public class ServerConfiguration implements ApplicationListener<TcpConnectionEvent> {

private final int port = SocketUtils.findAvailableServerSocket(5000);

@MessagingGateway(defaultRequestChannel="toTcp")
public interface Gateway {
    String send(String in);
}

@Bean
public AbstractServerConnectionFactory serverFactory() {
    System.out.println("serverFactory");
    AbstractServerConnectionFactory connectionFactory = new TcpNetServerConnectionFactory(port);
    return connectionFactory;
}

@Bean MessageChannel toTcp() {
    System.out.println("creating toTcp DirectChannel");
    DirectChannel dc = new DirectChannel();
    dc.setBeanName("toTcp");

    return dc;
}

@Bean
public MessageChannel fromTcp() {
    System.out.println("creating fromTcp DirectChannel");
    DirectChannel dc = new DirectChannel();
    dc.setBeanName("fromTcp");

    return dc;
}

// Inbound channel adapter. This receives the data from the client
@Bean
public TcpReceivingChannelAdapter inboundAdapter(AbstractServerConnectionFactory connectionFactory) {
    System.out.println("Creating inbound adapter");
    TcpReceivingChannelAdapter inbound = new TcpReceivingChannelAdapter();

    inbound.setConnectionFactory(connectionFactory);
    inbound.setOutputChannel("fromTcp");

    return inbound;
}

// Outbound channel adapter. This sends the data to the client
@Bean
@ServiceActivator(inputChannel="toTcp")
public TcpSendingMessageHandler outboundAdapter(AbstractServerConnectionFactory connectionFactory) {
    System.out.println("Creating outbound adapter");
    TcpSendingMessageHandler outbound = new TcpSendingMessageHandler();
    outbound.setConnectionFactory(connectionFactory);
    return outbound;
}

// Endpoint example 
@MessageEndpoint
public static class Echo {

    // Server
    @Transformer(inputChannel="fromTcp", outputChannel="toEcho")
    public String convert(byte[] bytes) {
        System.out.println("convert: " + new String(bytes));
        return new String(bytes);
    }

    // Server
    @ServiceActivator(inputChannel="toEcho", outputChannel="toTcp")
    public String upCase(String in) {
        System.out.println("upCase: " + in.toUpperCase());
        return in.toUpperCase();
    }
}

@Override
public void onApplicationEvent(TcpConnectionEvent event) {
    System.out.println("Got TcpConnectionEvent: source=" + event.getSource() + 
            ", id=" + event.getConnectionId()); 
}   
}