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RSE services API concurrency ... [message #656308]

Fri, 25 February 2011 01:07

Alex Pitigoi

Messages: 17
Registered: July 2009

Junior Member

I am planning to use RSE services API in a parallel execution environment using SSH and SFTP protocols and I'd be interested to know if any part of the API was designed to support concurrency and which are certainly not thread safe. That being said, I am aware of the existing separation between GUI dispatch thread and the background ones.

Any hints and recommendations are very much appreciated.
Thanks,
Alex

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Re: RSE services API concurrency ... [message #657867 is a reply to message #656308]

Fri, 04 March 2011 12:11

Martin Oberhuber

Messages: 1007
Registered: July 2009

Senior Member

Hi Alex,

for SftpFileService I'm pretty sure it is thread-safe because all access is guarded by fDirChannelMutex . The Mutex class itself also looks good.

For JSch itself I googled a bit and got mixed reports. There have clearly been problems with concurrency in the past, but the latest versions look good... even EXTENSIVE load testing of Sftp was successful.

I haven't yet looked at the new channel pooling in detail (SSHChannel came in as a community contribution through bug 256581), but I couldn't find any obvious problems.

I cannot make any statement about SSH Shell access.

So summing up, I think the services should mostly be good. That being said, it'll be your own responsibility how you apply them. But I think I can promise that if you find any concurrency issues and report them (ideally with a patch associated) these will be looked at with high priority.

HTH,
Martin

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Re: RSE services API concurrency ... [message #657869 is a reply to message #656308]

Fri, 04 March 2011 12:13

Martin Oberhuber

Messages: 1007
Registered: July 2009

Senior Member

PS you might be interested hearing that http://aptana.com uses a different (commercial) SSH library in their Aptana Studio, which is also available as Eclipse plugins under GPL. I haven't looked at that other SSH library but thought that you might be interested.

There is also a third Java SSH library available (I think it's named Ganymed or so), and BouncyCastle might also provide SSH (not sure).

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