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An SimpleRenewer allows a TupleSpace to check if a TupleEntry is still alive.
Creates a new SimpleRenewer that keeps an object alive for another sec seconds.
 
               # File rinda/rinda.rb, line 314
def initialize(sec=180)
  @sec = sec
end
             
            Called by the TupleSpace to check if the object is still alive.
 
               # File rinda/rinda.rb, line 321
def renew
  @sec
end