docs: public void writeSilenceForced(TickRange vtr)
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "writeSilenceForced", new Object[] { vtr });
  
          long start = vtr.startstamp;
          long end = vtr.endstamp;
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
          {
              SibTr.debug(tc, "writeSilenceForced from: " + start + " to " + end + " on Stream " + streamID);
          }
  
          TickRange tr =
                          new TickRange(
                                          TickRange.Completed,
                                          start,
                                          end);
  
          synchronized (this)
          {
              tr = oststream.writeCompletedRangeForced(tr);
              try
              {
                  if (tr.startstamp == 0)
                  {
                      //we are completed up to this point so we can
                      //simulate receiving an ack. This will enable the 
                      //src stream to remove the msg from the store if it is no longer
                      //needed
                      writeAckPrefix(tr.endstamp);
                  }
              } catch (SIResourceException e)
              {
                  FFDCFilter.processException(
                                              e,
                                              "com.ibm.ws.sib.processor.gd.InternalOutputStream.writeSilenceForced",
                                              "1:1273:1.83.1.1",
                                              this);
              }
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "writeSilenceForced");
  
      }