/// <summary>
/// When we receive a new reading, check all the observer clients to see if we need to send any threshold notifications
/// </summary>
/// <param name="sender">The sender themometer</param>
/// <param name="e">The <see cref="NewReadingReceivedEventArgs"/> reading</param>
private void _thermometer_OnNewReadingReceived(object sender, NewReadingReceivedEventArgs e)
{
foreach (var observation in _observations)
{
var t = IsThresholdReached(observation, e);
var f = IsFirstReading(observation, e);
var d = IsReadingDifferentThanLastOne(observation, e);
// Ask subclass if we should send the notification, and keep the flow steps here (Template Method).
if (IsThresholdReached(observation, e) &&
(IsFirstReading(observation, e) ||
(IsReadingDifferentThanLastOne(observation, e) &&
IsSensitivityVarianceMet(observation, e))))
{
// Set the current temperature
observation.Threshold.CurrentReading = e.Reading;
// Notify
observation.CallBack(observation.Threshold);
// Update last notification temperature
observation.Threshold.LastNotificationTemperature = e.Reading;
}
}
}
protected bool IsSensitivityVarianceMet(ThresholdObservation observation, NewReadingReceivedEventArgs e) => Math.Abs(e.Reading - observation.Threshold.LastNotificationTemperature.Value) >= observation.Threshold.Sensitivity;
protected bool IsReadingDifferentThanLastOne(ThresholdObservation observation, NewReadingReceivedEventArgs e) => e.Reading != observation.Threshold.LastNotificationTemperature;
// Common business logic snippets to all protected bool IsFirstReading(ThresholdObservation observation, NewReadingReceivedEventArgs e) => !observation.Threshold.LastNotificationTemperature.HasValue;
/// <summary> /// Template method to ask the subclass if the threshold was reached /// </summary> /// <param name="observation">The observation with all the necessary info</param> /// <param name="e">The current reading received</param> /// <returns></returns> protected abstract bool IsThresholdReached(ThresholdObservation observation, NewReadingReceivedEventArgs e);
// Check if we've hit the threshold protected override bool IsThresholdReached(ThresholdObservation observation, NewReadingReceivedEventArgs e) => e.Reading >= observation.Threshold.Temperature;