Java Outbound Adaptor processing - spring

Question

I have created an application that adds inbound adaptors at run time for ftp servers and registers them for removing at a certain stage if needed, this app will pull a csv file from ftp server(s) and place it in my local in a folder having the name of the ftp server, so every server I add will have a separate local folder created and the csv file is saved in it, now this is accomplished smoothly, the second part is I want to change the format of that file and then send it back to the respective server, so basically I need to use outbound adaptor, in this case I would need to create outbound adaptors at run time at the same time when creating inbound adaptor or adding a server, this should be done through controller same as the inbound, I searched for possible solutions and tried a one that is below but did not work or did not perform any sending of files to destination, any solution on how I can accomplish this?
In the configuration class I added the below:
public IntegrationFlow ftpOutboundFlow(Branch myBranch){
return IntegrationFlows.from(OUTBOUND_CHANNEL)
.handle(Ftp.outboundAdapter(createNewFtpSessionFactory(myBranch), FileExistsMode.FAIL)
.useTemporaryFileName(true)
.remoteFileSeparator("/")
//.fileNameExpression("BEY/FEFOexportBEY.csv")
.remoteDirectory(myBranch.getFolderPath()))
.get();
}
#MessagingGateway
public interface MyGateway {
#Gateway(requestChannel = OUTBOUND_CHANNEL)
void sendToFtp(File file);
}
#Bean
public IntegrationFlow ftpOutboundChannel() {
return IntegrationFlows.from(OUTBOUND_CHANNEL)
.publishSubscribeChannel(p -> p
.subscribe(t -> t.handle(System.out::println)))
/*.transform(p -> {
LOG.info("Outbound intermediate Channel, message=rename file:" + p);
return p;
})*/
.channel(new NullChannel())
.get();
}
And in the Controller class
#RequestMapping("/branch/showbranch/{id}")
public String getBranch (#PathVariable String id, Model model){
model.addAttribute("branch", branchService.getById(Long.valueOf(id)));
addFlowftp(id);
addFlowftpOutbound(id);
return "/branch/showbranch";
}
private void addFlowFtp(String name) {
branch = branchService.getById(Long.valueOf(name));
System.out.println(branch.getBranchCode());
IntegrationFlow flow = ftIntegration.fileInboundFlowFromFTPServer(branch);
this.flowContext.registration(flow).id(name).register();
}
private void addFlowftpOutbound(String name) {
branch = branchService.getById(Long.valueOf(name));
System.out.println(branch.getBranchCode());
IntegrationFlow flow = ftIntegration.ftpOutboundFlow(branch);
// this.flowContext.registration(flow).id(name).register();
myGateway.sendToFtp(new File("BEY/FEFOexportBEY.csv"));
}
Here is what I get in the consol as error when I enable the register before sending the file:
java.lang.IllegalArgumentException: An IntegrationFlow 'IntegrationFlowRegistration{integrationFlow=StandardIntegrationFlow{integrationComponents={org.springframework.integration.ftp.inbound.FtpInboundFileSynchronizer#aadab28=98.org.springframework.integration.ftp.inbound.FtpInboundFileSynchronizer#0, org.springframework.integration.config.SourcePollingChannelAdapterFactoryBean#aa290b3=stockInboundPoller, org.springframework.integration.transformer.MethodInvokingTransformer#e5f85cd=98.org.springframework.integration.transformer.MethodInvokingTransformer#0, 98.channel#0=98.channel#0, org.springframework.integration.config.ConsumerEndpointFactoryBean#319dff2=98.org.springframework.integration.config.ConsumerEndpointFactoryBean#0}}, id='98', inputChannel=null}' with flowId '98' is already registered.
An existing IntegrationFlowRegistration must be destroyed before overriding.
After my second trial where I removed the registration from the first method and only tried with the second method but nothing was sent to the FTP:
GenericMessage [payload=BEY\FEFOexportBEY.csv, headers={id=43cfc2db-41e9-0866-8e4c-8e95968189ff, timestamp=1542702869007}]
2018-11-20 10:34:29.011 INFO 13716 --- [nio-8081-exec-6] f.s.s.configuration.FTIntegration : Outbound intermediate Channel, message=rename file:BEY\FEFOexportBEY.csv

Answer 1

You need to perform this.flowContext.registration(flow).id(name).register(); before sending the file via myGateway.sendToFtp(new File("BEY/FEFOexportBEY.csv"));.
That's first.
Other concern I see in your code that you have a ftpOutboundChannel bean for an IntegrationFlow which is subscribed to the same OUTBOUND_CHANNEL. If that one is not declared as a PublishSubscribeChannel, then you'll end up with the round-robin distribution. And I believe you would like to have file sent to the FTP and logged. So, indeed you need to declare that channel as a PublishSubscribeChannel.
You don't have any error because that OUTBOUND_CHANNEL has your ftpOutboundChannel IntegrationFlow as subscriber.