Spring Integration TcpInboundGateway sending conditional reply - spring-integration

Question

I have configured TcpInboundGateway to receive requests from client and my configuration is as follows. So as per below configuration every client requested is responded back,but what i want is response should be send back only if certain condition is true,not the every time, what changes needs to be done in configuration?
#SpringBootApplication
#IntegrationComponentScan
public class SpringIntegrationApplication extends SpringBootServletInitializer{
public static void main(String[] args) throws IOException {
ConfigurableApplicationContext ctx = SpringApplication.run(SpringIntegrationApplication.class, args);
System.in.read();
ctx.close();
}
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(SpringIntegrationApplication.class);
}
private static Class<SpringIntegrationApplication> applicationClass = SpringIntegrationApplication.class;
#Bean
TcpNetServerConnectionFactory cf(){
TcpNetServerConnectionFactory connectionFactory=new TcpNetServerConnectionFactory(8765);
return connectionFactory;
}
#Bean
TcpInboundGateway tcpGate(){
TcpInboundGateway gateway=new TcpInboundGateway();
gateway.setConnectionFactory(cf());
gateway.setRequestChannel(requestChannel());
return gateway;
}
#Bean
public MessageChannel requestChannel(){
return new DirectChannel();
}
#MessageEndpoint
public class Echo {
#ServiceActivator(inputChannel="requestChannel")
public byte[] echo(byte[] in,#SuppressWarnings("deprecation") #Header("ip_address") String ip){
byte[] rawbytes = gosDataSerivce.byteArrayToHex(in,ip);//Process bytes and returns result
return rawbytes;
}
}
}

Answer 1

Not sure where is your problem, but you can just simply return null from your echo(). In that case the ServiceActivatingHandler doesn't care and stops it work. Just because of requiresReply = false.
From other side the TcpInboundGateway doesn't care about null, too:
Message<?> reply = this.sendAndReceiveMessage(message);
if (reply == null) {
if (logger.isDebugEnabled()) {
logger.debug("null reply received for " + message + " nothing to send");
}
return false;
}
That is possible because of replyTimeout option for the MessagingTemplate on the background. By default it is 1 sec. After that the sendAndReceiveMessage() just returns null to the caller.
You can adjust this option on the TcpInboundGateway.