/// <summary>
/// process a new coordinates value for a car, work out the speed and race positions
/// </summary>
/// <param name="coords">new car coordinates</param>
internal void HandleCarDataEvent(JCarCoords coords)
{
// TODO check whether it is computationally expensive to provide the new value
// as this will only be needed each time data about a new car is received
Car car = Cars.GetOrAdd(coords.CarIndex,
new Car(coords, RaceMonitor_SpeedEvent, RaceMonitor_PositionEvent, RaceMonitor_LapEvent));
// store the new coordinates
Cars[coords.CarIndex].UpdateCoordinates(coords);
currentTimeData.Timestamp = coords.Timestamp;
}
/// <summary>
/// handles a new MQTT Car Coordinates message
/// </summary>
/// <param name="sender">event source</param>
/// <param name="e">event arguments</param>
/// TODO - consider implementing the "IPublishDataConverter" to do conversion
private void Client_MessageAvailable(object sender, MqttMessageEventArgs e)
{
// only process messages of interest
if (CarCoordinatesTopic == e.Topic)
{
string ReceivedMessage = Encoding.UTF8.GetString((byte[])e.Message);
// convert the message into a JCarCoords message
JCarCoords coords = JsonConvert.DeserializeObject <JCarCoords>(ReceivedMessage);
RaceDataHandler.ProcessRaceData(coords);
}
}
/// <summary>
/// implementation of the ICarCoordinates interface
/// </summary>
/// <param name="coords">car coordinate data</param>
public void ProcessRaceData(JCarCoords coords)
{
if (currentTimeData == null)
{
// set up the first timestamp object
currentTimeData = new TimestampData(coords.Timestamp, this);
}
else if (currentTimeData.Timestamp != coords.Timestamp)
{
// data has arrived with a new timestamp, work out the positions
// of the cars for the previous timestamp
RecalculatePositions(currentTimeData);
}
HandleCarDataEvent(coords);
}
/// <summary>
/// implementation of the ICarCoordinates interface
/// </summary>
/// <param name="coords">car coordinate data</param>
public void ProcessRaceData(JCarCoords coords)
{
// TODO replace with a more meaningful race model
// received new car coordinates
// store the information - Car array
// calculate speed & publish
speed++;
speed %= 300;
client.SendSpeed(coords.Timestamp, coords.CarIndex, speed);
// calculate posision & publish
position = random.Next(1, 6);
client.SendPosition(coords.Timestamp, coords.CarIndex, position);
// identify interesting events & publish
if (speed == 1)
{
client.SendRaceEvent(coords.Timestamp, $"event {position}");
}
}
/// <summary>
/// process new car coordinate message
/// </summary>
/// <param name="coords"></param>
public void PerformTask(JCarCoords coords)
{
ProcessRaceData(coords);
}
