I need to get a file daily via SFTP. I would like to use Spring Integration with Java config. The file is generally available at a specific time each day. The application should try to get the file near that time each day. If the file is not available, it should continue to retry for x attempts. After x attempts, it should send an email to let the admin know that the file is still not available on the SFTP site.
One option is to use SftpInboundFileSynchronizingMessageSource. In the MessageHandler, I can kick off a job to process the file. However, I really don't need synchronization with the remote file system. After all, it is a scheduled delivery of the file. Plus, I need to delay at most 15 minutes for the next retry and to poll every 15 minutes seems a bit overkill for a daily file. I guess that I could use this but would need some mechanism to send email after a certain time elapsed and no file was received.
The other option seems to be using get of the SFTP Outbound Gateway. But the only examples I can find seem to be XML config.
Update
Adding code after using help provided by Artem Bilan's answer below:
Configuration class:
@Bean
@InboundChannelAdapter(autoStartup="true", channel = "sftpChannel", poller = @Poller("pollerMetadata"))
public SftpInboundFileSynchronizingMessageSource sftpMessageSource(ApplicationProperties applicationProperties, PropertiesPersistingMetadataStore store) {
SftpInboundFileSynchronizingMessageSource source =
new SftpInboundFileSynchronizingMessageSource(sftpInboundFileSynchronizer(applicationProperties));
source.setLocalDirectory(new File("ftp-inbound"));
source.setAutoCreateLocalDirectory(true);
FileSystemPersistentAcceptOnceFileListFilter local = new FileSystemPersistentAcceptOnceFileListFilter(store,"test");
source.setLocalFilter(local);
source.setCountsEnabled(true);
return source;
}
@Bean
public PollerMetadata pollerMetadata() {
PollerMetadata pollerMetadata = new PollerMetadata();
List<Advice> adviceChain = new ArrayList<Advice>();
adviceChain.add(retryCompoundTriggerAdvice());
pollerMetadata.setAdviceChain(adviceChain);
pollerMetadata.setTrigger(compoundTrigger());
return pollerMetadata;
}
@Bean
public RetryCompoundTriggerAdvice retryCompoundTriggerAdvice() {
return new RetryCompoundTriggerAdvice(compoundTrigger(), secondaryTrigger());
}
@Bean
public CompoundTrigger compoundTrigger() {
CompoundTrigger compoundTrigger = new CompoundTrigger(primaryTrigger());
return compoundTrigger;
}
@Bean
public Trigger primaryTrigger() {
return new CronTrigger("*/60 * * * * *");
}
@Bean
public Trigger secondaryTrigger() {
return new PeriodicTrigger(10000);
}
@Bean
@ServiceActivator(inputChannel = "sftpChannel")
public MessageHandler handler(PropertiesPersistingMetadataStore store) {
return new MessageHandler() {
@Override
public void handleMessage(Message<?> message) throws MessagingException {
System.out.println(message.getPayload());
store.flush();
}
};
}
RetryCompoundTriggerAdvice class:
public class RetryCompoundTriggerAdvice extends AbstractMessageSourceAdvice {
private final CompoundTrigger compoundTrigger;
private final Trigger override;
private int count = 0;
public RetryCompoundTriggerAdvice(CompoundTrigger compoundTrigger, Trigger overrideTrigger) {
Assert.notNull(compoundTrigger, "'compoundTrigger' cannot be null");
this.compoundTrigger = compoundTrigger;
this.override = overrideTrigger;
}
@Override
public boolean beforeReceive(MessageSource<?> source) {
return true;
}
@Override
public Message<?> afterReceive(Message<?> result, MessageSource<?> source) {
if (result == null && count <= 5) {
count++;
this.compoundTrigger.setOverride(this.override);
}
else {
this.compoundTrigger.setOverride(null);
if (count > 5) {
//send email
}
count = 0;
}
return result;
}
}
