An SimpleRenewer allows a TupleSpace to check if a TupleEntry is still alive.
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      Class Public methods
      
        
            
              new(sec=180)
            
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            Creates a new SimpleRenewer that keeps an
object alive for another sec seconds.
Instance Public methods
      
        
            
              renew()
            
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            Called by the TupleSpace to check if the object is still alive.