Spring Batch Integration using Java DSL / launching jobs - spring-batch

Question

I've a working spring boot/batch projet containing 2 jobs.
I'm now trying to add Integration to poll files from a remote SFTP using only java configuration / java DSL, and then launch a job.
The file polling is working but I've no idea on how to launch a Job in my flow, despite reading these links :
Spring Batch Integration config using Java DSL
and
Spring Batch Integration job-launching-gateway
some code snippets:
#Bean
public SessionFactory SftpSessionFactory()
{
DefaultSftpSessionFactory sftpSessionFactory = new DefaultSftpSessionFactory();
sftpSessionFactory.setHost("myip");
sftpSessionFactory.setPort(22);
sftpSessionFactory.setUser("user");
sftpSessionFactory.setPrivateKey(new FileSystemResource("path to my key"));
return sftpSessionFactory;
}
#Bean
public IntegrationFlow ftpInboundFlow() {
return IntegrationFlows
.from(Sftp.inboundAdapter(SftpSessionFactory())
.deleteRemoteFiles(Boolean.FALSE)
.preserveTimestamp(Boolean.TRUE)
.autoCreateLocalDirectory(Boolean.TRUE)
.remoteDirectory("remote dir")
.regexFilter(".*\\.txt$")
.localDirectory(new File("C:/sftp/")),
e -> e.id("sftpInboundAdapter").poller(Pollers.fixedRate(600000)))
.handle("FileMessageToJobRequest","toRequest")
// what to put next to process the jobRequest ?
For .handle("FileMessageToJobRequest","toRequest") I use the one described here http://docs.spring.io/spring-batch/trunk/reference/html/springBatchIntegration.html
I would appreciate any help on that, many thanks.
EDIT after Gary comment
I've added, it doesn't compile -of course- because I don't understand how the request is propagated :
.handle("FileMessageToJobRequest","toRequest")
.handle(jobLaunchingGw())
.get();
}
#Bean
public MessageHandler jobLaunchingGw() {
return new JobLaunchingGateway(jobLauncher());
}
#Autowired
private JobLauncher jobLauncher;
#Bean
public JobExecution jobLauncher(JobLaunchRequest req) throws JobExecutionException {
JobExecution execution = jobLauncher.run(req.getJob(), req.getJobParameters());
return execution;
}
I've found a way to launch a job using a #ServiceActivator and adding this to my flow but I'm not sure it's good practice :
.handle("lauchBatchService", "launch")
#Component("lauchBatchService")
public class LaunchBatchService {
private static Logger log = LoggerFactory.getLogger(LaunchBatchService.class);
#Autowired
private JobLauncher jobLauncher;
#ServiceActivator
public JobExecution launch(JobLaunchRequest req) throws JobExecutionException {
JobExecution execution = jobLauncher.run(req.getJob(), req.getJobParameters());
return execution;
}
}

Answer 1

.handle(jobLaunchingGw())
// handle result
...
#Bean
public MessageHandler jobLaunchingGw() {
return new JobLaunchingGateway(jobLauncher());
}
where jobLauncher() is the JobLauncher bean.
EDIT
Your service activator is doing about the same as the JLG; it uses this code.
Your jobLauncher #Bean is wrong.
#Beans are definitions; they don't do runtime stuff like this
#Bean
public JobExecution jobLauncher(JobLaunchRequest req) throws JobExecutionException {
JobExecution execution = jobLauncher.run(req.getJob(), req.getJobParameters());
return execution;
}
Since you are already autowiring a JobLauncher, just use that.
#Autowired
private JobLauncher jobLauncher;
#Bean
public MessageHandler jobLaunchingGw() {
return new JobLaunchingGateway(jobLauncher);
}