You might get a more accurate or precise answer from the seesaw-clj group.  
In indirect & partial answer to one-third of your questions:  As I recall, 
in Swing, just about every bit of intense or blocking work (even reading 
files) belongs on a background thread.  You can make and manage the 
background thread or threads in any way you like.  There is a SwingWorker, 
but you're not limited to it.  The key thing is that the background threads 
should not touch Swing, except via SwingUtilities.invokeLater.  As for the 
foreground, Swing won't know which parts to disable, so there is no 
shortcut for that.  Another option is to put up a modal progress dialog, as 
long as people can Cancel it (which, in Java, might be unable to kill the 
background thread, but could at least cut it loose) in case the fuse blows 
and the lights go out right after they press your XSLT button and they do 
not want to spend battery power on it.  

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