Sort command allows multiple instances to be run

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What steps will reproduce the problem?
1. On a larger data set, use Sort command, then wait a few seconds and use Sort 
command again, wait a few seconds and use Sort command again.

What is the expected output? What do you see instead?

Java heap grows with every instance of using the Sort command, even though the 
previous initial Sort is not finished yet.  The user does not know this, and is 
not given a progress bar or "Working... panel" to note that Refine is still 
processing the initial Sort.  I also suspect Refine (via programmatically such 
as with Paul Makepeace's Python client) will also allow a Sort command to 
continue to be accepted and run before it has finished with the first one.  
Refine should probably return an error of some kind if this happens.

Original issue reported on code.google.com by thadguidry on 4 Nov 2011 at 4:05

[GoogleCodeExporter]

Bump all unfinished 2.5 Milestone tags to next release

Original comment by tfmorris on 12 Dec 2011 at 7:56

• Added labels: Milestone-2.6

[GoogleCodeExporter]

Original comment by tfmorris on 18 Sep 2012 at 6:07

• Changed state: Accepted