Sorting order issue for SFTP inbound adapter

[grenner]

I have a the following (ordinary) sftp inpbound adapter definition:

<int-sftp:inbound-channel-adapter
	local-directory="${sftp.localDir}" channel="sdml.in" session-factory="cachedSftpSessionFactory"
	remote-directory="${sftp.remoteDir}" delete-remote-files="true"
	filter="compositFilter">
	<int:poller fixed-rate="${sftp.pollingRate}"
		max-messages-per-poll="-1" task-executor="pool">
		<int:advice-chain>
			<ref bean="sysStateInspectingInterceptor" />
		</int:advice-chain>
	</int:poller>
</int-sftp:inbound-channel-adapter>

Here I used a composite filter, where one of the filter's goal is to sorts the files in a business-specific order. Expected behaviour for the xml declaration above is that it should download and forward the eligible files in sorted order (expressed in terms of the filter-logic).
I find that this is not the case; filtering is ok, download order is still ok, but Messages generated by the adapter are inordered!
Looking at the source I've found the following:
SFTP message source - and generally all MessageSource<File> implementation extending AbstractInboundFileSynchronizingMessageSource must exhibit this behaviour. I guess the reason is that AbstractInboundFileSynchronizingMessageSource instantiates a FileReadingmessageSource in order to handle the downloaded files.
I - as an SI user - dont have any possibilities to configure this fileSource instance! This is the couse of the problem.
Regarding this issue https://jira.springsource.org/browse/INT-1857, processing order of a FileReadingMessageSource can be influenced by a Comparator<File> of the queue, what can be nicely configured via a <int-file:inbound-channel-adapter> (as a comparator attribute), but not in a <int-sftp:inbound-channel-adapter>!
Please give me some hints, workaround, how could i achive ordered processing of the downloaded files?
thanks,
Gabor

[oleg.zhurakousky]

Gabor

I'll try to address INT-1857 today, so you should be able to get it from the nightly tomorrow. I'll let you know.

[oleg.zhurakousky]

Also, could you please open a separate JIRA for adding 'comparator' attribute on FTP/SFTP adapters?

[oleg.zhurakousky]

Sorry, weren't looking. INT-1857 is addressed, but not for FTP/SFTP and hat is what we are trying to fix

[grenner]

Opened an issue for it: INT-1901
Thanks!
Gabor

[oleg.zhurakousky]

Gabor, I just pushed the change. So now you can configure comparator on both FTP and SFTP the same way you do for file. Give it a shot and let me know.
Cheers

[grenner]

Oleg, thanks for your quick work! I have some other issues, but I'll back soon and will test the change!
thx,
Gabor

[grenner]

You did a great job, Oleg, it works pretty fine, orders files as expected!
Thank you!