code: public final boolean removeDeliveryDelayable(DeliveryDelayable deliveryDelayable) throws SevereMessageStoreException
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
          {
              SibTr.entry(tc, "removeDeliveryDelayable",
                          "objId="
                                          + (deliveryDelayable == null ? "null" : String.valueOf(deliveryDelayable.deliveryDelayableGetID()))
                                          + " ET="
                                          + (deliveryDelayable == null ? "null" : String.valueOf(deliveryDelayable.deliveryDelayableGetDeliveryDelayTime()))
                                          + " addEnabled="
                                          + addEnabled);
          }
  
          boolean reply = false;
          boolean cancelled = false;
          // Ignore this request if the DeliveryDelayManager has ended or the given entry is null
          synchronized (lockObject)
          {
              if (addEnabled && deliveryDelayable != null)
              {
                  long deliveryDelay = deliveryDelayable.deliveryDelayableGetDeliveryDelayTime();
                  DeliveryDelayableReference delayedDeliverableRef = new DeliveryDelayableReference(deliveryDelayable);
                  delayedDeliverableRef.setDeliveryDelayTime(deliveryDelay);
                  // Remove the DeliveryDelayable from the deliveryDelay index
                  reply = deliveryDelayIndex.remove(delayedDeliverableRef);
                  if (reply && deliveryDelayIndex.size() <= 0) // We just removed the last entry
                  {
                      if (deliveryDelayAlarm != null)
                      {
                          deliveryDelayAlarm.cancel();
                          alarmScheduled = false;
                          cancelled = true;
                      }
                  }
  
              }
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "removeDeliveryDelayable", "deliveryDelayIndexSize=" + deliveryDelayIndex.size() + " reply=" + reply + " cancelled=" + cancelled);
          return reply;
      }
docs: Remove an DeliveryDelayable reference for an item from the deliveryDelay index.
  
  @param deliveryDelayable the DeliveryDelayable item for which a reference is to be removed from the deliveryDelay index.
  @return true if the reference was removed from the index, false otherwise.
  @throws SevereMessageStoreException