code: public boolean isPersistent()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) 
      {
        SibTr.entry(this, tc, "isPersistent");
        SibTr.exit(tc, "isPersistent", Boolean.valueOf(persistent));	
      }
      return persistent;
    }
docs: Get the persistence of this StreamSet
  
  @return true if this StreamSet is persistent