Spring Integration how to use Control Bus with JavaConfig, no DSL - spring-boot

Question

I'm having a few issues with Spring Integration and the control bus. I need to turn auto-start off on an InboundChannelAdapter. However when I do this I can't get the ControlBus to start the channel adapter.
I've searched for an answer online, but most of the examples use XML configuration.
Here is the entirety of my code:
package com.example.springintegrationdemo;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.annotation.InboundChannelAdapter;
import org.springframework.integration.annotation.Poller;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.config.ExpressionControlBusFactoryBean;
import org.springframework.integration.core.MessageSource;
import org.springframework.integration.file.FileReadingMessageSource;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.support.GenericMessage;
import java.io.File;
#SpringBootApplication
#EnableIntegration
public class SpringIntegrationDemoApplication {
#Bean
public MessageChannel fileChannel() {
return new DirectChannel();
}
#Bean(name = "fileMessageSource")
#InboundChannelAdapter(channel = "fileChannel", poller = #Poller(fixedDelay = "1000"),autoStartup = "false")
public MessageSource<File> fileMessageSource() {
FileReadingMessageSource fileReadingMessageSource = new FileReadingMessageSource();
fileReadingMessageSource.setDirectory(new File("lz"));
return fileReadingMessageSource;
}
#Bean
#ServiceActivator(inputChannel = "fileChannel")
public MessageHandler messageHandler() {
MessageHandler messageHandler = message -> {
File f = (File) message.getPayload();
System.out.println(f.getAbsolutePath());
};
return messageHandler;
}
#Bean
MessageChannel controlChannel() {
return new DirectChannel();
}
#Bean
#ServiceActivator(inputChannel = "controlChannel")
ExpressionControlBusFactoryBean controlBus() {
ExpressionControlBusFactoryBean expressionControlBusFactoryBean = new ExpressionControlBusFactoryBean();
return expressionControlBusFactoryBean;
}
#Bean
CommandLineRunner commandLineRunner(#Qualifier("controlChannel") MessageChannel controlChannel) {
return (String[] args)-> {
System.out.println("Starting incoming file adapter: ");
boolean sent = controlChannel.send(new GenericMessage<>("#fileMessageSource.start()"));
System.out.println("Sent control message successfully? " + sent);
while(System.in.available() == 0) {
Thread.sleep(50);
}
};
}
public static void main(String[] args) {
SpringApplication.run(SpringIntegrationDemoApplication.class, args);
}
}
The message is sent to the control bus component successfully, but the inbound channel adapter never starts.
I would appreciate any help.
Thanks,
Dave

Answer 1

See here: https://docs.spring.io/spring-integration/docs/current/reference/html/configuration.html#annotations_on_beans
The fileMessageSource bean name is exactly for the FileReadingMessageSource. A SourcePollingChannelAdapter created from the InboundChannelAdapter has this bean name: springIntegrationDemoApplication.fileMessageSource.inboundChannelAdapter.
The #EndpointId can help you to simplify it.
In other words: everything is OK with your config, only the problem that you don't use the proper endpoint id to start the SourcePollingChannelAdapter.