code: public boolean writeSilence(SIMPMessage m)
                      throws SIResourceException
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "writeSilence", new Object[] { m });
  
          JsMessage jsMsg = m.getMessage();
  
          // There may be Completed ticks after the Value, if so then
          // write these into the stream too
          long stamp = jsMsg.getGuaranteedValueValueTick();
          long starts = jsMsg.getGuaranteedValueStartTick();
          long ends = jsMsg.getGuaranteedValueEndTick();
          if (ends < stamp)
              ends = stamp;
  
          TickRange tr =
                          new TickRange(
                                          TickRange.Completed,
                                          starts,
                                          ends);
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
          {
              SibTr.debug(tc, "writeSilence from: " + starts + " to " + ends + " on Stream " + streamID);
          }
  
          synchronized (this)
          {
              tr = oststream.writeCompletedRange(tr);
  
              long completedPrefix = oststream.getCompletedPrefix();
              if (completedPrefix > oack)
              {
                  oack = completedPrefix;
              }
  
              // Only want to send Silence if we know it has been missed
              // because we have sent something beyond it
              if (lastSent > ends)
                  sendSilence(ends + 1, completedPrefix);
  
              // SIB0105
              // Message silenced so reset the health state
              if (blockedStreamAlarm != null)
                  blockedStreamAlarm.checkState(false);
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "writeSilence");
  
          setLastSent(jsMsg.getGuaranteedValueEndTick());
  
          return true;
      }
docs: This method uses a Value message to write Silence into the stream,
  either because a message has been filtered out or because it has
  been rolled back
  
  @param m The value message
  
  @return boolean true if the message can be sent downstream
  message is not sent if it has the RequestedOnly
  flag set and its tick in the stream is not in
  the Requested state