code: @Override
      public void flush(int requestNumber) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "flush", "" + requestNumber);
  
          // Locate the browser session to use.
          BrowserSession browserSession = mainConsumer.getBrowserSession();
          SIBusMessage msg = null;
  
          // Browse the next message and send it to the client.
          try {
              msg = getNextMessage(browserSession, getConversation(), (short) requestNumber);
              if (msg != null)
                  sendMessage(msg);
  
              // Send a response to the browse request.
              try {
                  getConversation().send(poolManager.allocate(),
                                         JFapChannelConstants.SEG_FLUSH_SESS_R,
                                         requestNumber,
                                         Conversation.PRIORITY_LOWEST,
                                         true,
                                         ThrottlingPolicy.BLOCK_THREAD,
                                         null);
              } catch (SIException e) {
                  FFDCFilter.processException(e, CLASS_NAME + ".flush",
                                              CommsConstants.CATBROWSECONSUMER_FLUSH_01,
                                              this);
  
                  SibTr.error(tc, "COMMUNICATION_ERROR_SICO2012", e);
  
                  // Nothing else we can do at this point as the comms exception suggests that the
                  // conversation is dead, anyway.
              }
  
          } catch (OperationFailedException e) {
              // No FFDC code needed
              if (TraceComponent.isAnyTracingEnabled() && tc.isEventEnabled())
                  SibTr.exception(this, tc, e);
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "flush");
      }
docs: Invoked when the client sends a flush consumer. Since browser sessions do
  not have an activeConsumer method this translates to attempting a single
  browse next and sending back the result.
  
  @param requestNumber