HandleRunnable(Future result, DeliveryObserver sender, MessageReference ref, boolean persist)
public HandleRunnable(Future result, DeliveryObserver sender, MessageReference ref, boolean persist)
      HandleRunnable(Future result, DeliveryObserver sender, MessageReference ref, boolean persist)      {         this.result = result;         this.sender = sender;         this.ref = ref;         this.persist = persist;      }