Sandstorm Shutdown

To shutdown Sandstorm, is-it enough to just stop, destroy and unload all 
stages in an arbitrary order?  It seems to me that we should stop stages 
  a specific order: stopping upstream stages before downstream stages. 
Thid is perfect if stages are organized in a DAG (Directed Acyclic 
Graph).  But what to do when there are cycle in the stage network?

Also, I think that all elements in a queue should be processed by its 
handler before a shutdown.  But, stopping a stage don't empty the queue 
(at least we say that it should).  So, how shutdown Sandstorm in such a 
way that all queue elements has been processed?


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