In the Consumer Value Add example, reactorChnl.dispatch() will be called after selector.select() returns and there is data available to be read in the reactor channel.

private void run()		
{		
	int selectRetVal, selectTime = 1000;
	while (true)
	{
        Set<SelectionKey> keySet = null;
        try
        {
        	selectRetVal = selector.select(selectTime);
              if (selectRetVal > 0)
            {
                keySet = selector.selectedKeys();
            }
        }
…
}

Then, reactorChnl.dispatch() will be called until there is no more messages to process.

while ((ret = reactorChnl.dispatch(dispatchOptions, errorInfo)) > 0) {}

The return value of ReactorChannel.dispatch() can be:

• A positive value if dispatching succeeded and there are more messages to process

• ReactorReturnCodes.SUCCESS if dispatching succeeded and there are no more messages to process

• ReactorReturnCodes.FAILURE, if dispatching failed (refer to errorInfo for additional information)

From this information, the Consumer Value Add example will dispatch the messages when there are messages available to process. It will not dispatch the messages after every 10 seconds except the code was modified or the data comes every 10 seconds.

Reactor dispatch is controlled by dispatchOptions, which is defined by maxMessages to process, which by default is 100. Therefore, usually dispatch fully dispatches the messages available on the descriptor, and if more is expected, it can be set higher.