Remote directory for sftp outbound gateway with DSL - spring-integration

Question

I'm having an issue with the SFTP outbound gateway using DSL.
I want to use a outbound gateway to send a file, then continue my flow.
The problem is that I have an exception telling me:
IllegalArgumentException: 'remoteDirectoryExpression' is required
I saw that I can use a RemoteFileTemplate where I can set the sftp session factory plus the remote directory information, but the directory I wan't is defined in my flow by the code put in the header just before the launch of the batch.
#Bean
public IntegrationFlow orderServiceFlow() {
return f -> f
.handleWithAdapter(h -> h.httpGateway("myUrl")
.httpMethod(HttpMethod.GET)
.expectedResponseType(List.class)
)
.split()
.channel(batchLaunchChannel());
}
#Bean
public DirectChannel batchLaunchChannel() {
return MessageChannels.direct("batchLaunchChannel").get();
}
#Bean
public IntegrationFlow batchLaunchFlow() {
return IntegrationFlows.from(batchLaunchChannel())
.enrichHeaders(h -> h
.headerExpression("oiCode", "payload")
)
.transform((GenericTransformer<String, JobLaunchRequest>) message -> {
JobParameters jobParameters = new JobParametersBuilder()
.addDate("exec_date", new Date())
.addString("oiCode", message)
.toJobParameters();
return new JobLaunchRequest(orderServiceJob, jobParameters);
})
.handle(new JobLaunchingMessageHandler(jobLauncher))
.enrichHeaders(h -> h
.headerExpression("jobExecution", "payload")
)
.handle((p, h) -> {
//Logic to retreive file...
return new File("");
})
.handle(Sftp.outboundGateway(sftpSessionFactory,
AbstractRemoteFileOutboundGateway.Command.PUT,
"payload")
)
.get();
}
I don't see how I can tell my outbound gateway which will be the directory depending what is in my header.

Answer 1

The Sftp.outboundGateway() has an overloaded version with the RemoteFileTemplate. So, you need to instantiate SftpRemoteFileTemplate bean and configure its:
/**
* Set the remote directory expression used to determine the remote directory to which
* files will be sent.
* #param remoteDirectoryExpression the remote directory expression.
*/
public void setRemoteDirectoryExpression(Expression remoteDirectoryExpression) {
This one can be like FunctionExpression:
setRemoteDirectoryExpression(m -> m.getHeaders().get("remoteDireHeader"))

Answer 2

Before I got an answer, I came with this solution but I'm not sure it's a good one.
// flow //
.handle((p, h) -> {
//Logic to retreive file...
return new File("");
})
.handle(
Sftp.outboundGateway(
remoteFileTemplate(new SpelExpressionParser().parseExpression("headers['oiCode']")),
AbstractRemoteFileOutboundGateway.Command.PUT,
"payload")
)
.handle(// next steps //)
.get();
public RemoteFileTemplate remoteFileTemplate(Expression directory) throws Exception {
RemoteFileTemplate template = new SftpRemoteFileTemplate(sftpSessionFactory);
template.setRemoteDirectoryExpression(directory);
template.setAutoCreateDirectory(true);
template.afterPropertiesSet();
return template;
}
But this provoke a warn because of exception thrown by the ExpresionUtils
java.lang.RuntimeException: No beanFactory