public void Implement()
{
Console.WriteLine("\nLearning Observer Pattern\n");
WeatherData weatherData = new WeatherData(temperature: 40, pressure: 120, humidity: 20);
Console.WriteLine(weatherData.ToString());
IObserver sObserver = new StatisticsDisplay();
weatherData.RegisterObserver(sObserver);
IObserver fObserver = new ForecastDisplay();
weatherData.RegisterObserver(fObserver);
IObserver gObserver = new GeneralDisplay();
weatherData.RegisterObserver(gObserver);
weatherData.NotifyObserver();
sObserver.Display();
fObserver.Display();
gObserver.Display();
weatherData.DataChanged(temperature: 20, pressure: 80, humidity: 10); //Just a dummy method which updates the weather data
Console.WriteLine($"\nWeather changed {weatherData.ToString()}");
sObserver.Display();
fObserver.Display();
gObserver.Display();
Console.WriteLine("\nObserver Removed: General Display");
weatherData.RemoveObserver(gObserver);
weatherData.DataChanged(temperature: -20, pressure: 20, humidity: 0); //Just a dummy method which updates the weather data
sObserver.Display();
fObserver.Display();
gObserver.Display();
}
private static void TestObserverPattern()
{
WeatherData weatherData = new WeatherData();
TemperatureReporter temperatureReporter = new TemperatureReporter();
CurrentConditionsDisplay currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
CurrentTemperatureDisplay currentTemperatureDisplay = new CurrentTemperatureDisplay(temperatureReporter);
Temperature t = new Temperature {
Temp = 80
};
temperatureReporter.TemperatureChanged(t);
t.Temp = 82;
temperatureReporter.TemperatureChanged(t);
Console.WriteLine(currentTemperatureDisplay.Display());
t.Temp = 78;
temperatureReporter.TemperatureChanged(t);
Console.WriteLine(currentTemperatureDisplay.Display());
weatherData.SetMeasurements(80, 65, 30.4);
weatherData.SetMeasurements(82, 70, 29.2);
weatherData.SetMeasurements(78, 90, 29.2);
Console.WriteLine(currentConditionsDisplay.Display());
Console.WriteLine(statisticsDisplay.Display());
Console.WriteLine(forecastDisplay.Display());
Console.WriteLine(heatIndexDisplay.Display());
}
static void Main(string[] args)
{
//var dict = new Dictionary<string, Studente>();
//Studente st = new Studente();
//Persona p = st;
//Pair p = new Pair("ciccio", true);
//string f = (string)p.First;
//var ps = new PairOfString("ciccio", "pippo");
//PairOf<string, bool> pairOfStringAndBool
// = new PairOf<string, bool>();
MeteoStationDelegate m = new MeteoStationDelegate();
var d1 = new ForecastDisplay();
var d2 = new AverageConditionsDisplay();
m.AddDisplay(d1.Update);
m.AddDisplay(d2.Update);
m.Start();
}
public void WhenCreateForecastDisplayAndCallSetMeasurementsMethodExpectDisplayMethodReturnImprovingMessage()
{
var weatherData = new WeatherData();
var forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 50, 80);
Assert.AreEqual("Forecast: Improving weather on the way!", forecastDisplay.Display());
}
public void ShouldObserveUpdate()
{
var weatherData = new WeatherData();
var currentDisplay = new CurrentConditionsDisplay(weatherData);
var forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
}
public void WeatherData_CanRemoveObservers()
{
WeatherData weatherData = new WeatherData();
IWeatherObserver statisticsDisplay = new StatisticsDisplay(weatherData);
IWeatherObserver forecastDisplay = new ForecastDisplay(weatherData);
IWeatherObserver conditionsDisplay = new CurrentConditionsDisplay(weatherData);
weatherData.RemoveObserver(statisticsDisplay);
Assert.AreEqual(2, weatherData.SubscriberCount);
}
public void WhenCreateForecastDisplayAndCallSetMeasurementsMethodTwiceAndCurrentPressureIsLowerThanLastPressureExpectDisplayMethodReturn()
{
var weatherData = new WeatherData();
var forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 50, 80);
weatherData.SetMeasurements(80, 50, 60);
Assert.AreEqual("Forecast: Watch out for cooler, rainy weather", forecastDisplay.Display());
}
public void WhenCreateForecastDisplayAndCallSetMeasurementsMethodTwiceAndLastPressureIsEqualThanCurrentPressureExpectDisplayMoreOfTheSameMessage()
{
var weatherData = new WeatherData();
var forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 50, 80);
weatherData.SetMeasurements(80, 50, 80);
Assert.AreEqual("Forecast: More of the same", forecastDisplay.Display());
}
public void WhenCreateDisplayAndCallSetMeasurementsMethodExpectAllObserversAreNotified()
{
var weatherData = new WeatherData();
var currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
var forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 50, 80);
Assert.AreEqual("Current conditions: 80 F degrees and 50 % humidity", currentConditionsDisplay.Display());
Assert.AreEqual("Forecast: Improving weather on the way!", forecastDisplay.Display());
}
public static void Start()
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
weatherData.SetMeasurements(82, 70, 29.2f);
weatherData.SetMeasurements(78, 90, 29.2f);
}
public static void Run()
{
var weatherData = new WeatherData();
var currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
var forecastDisplay = new ForecastDisplay(weatherData);
var statisticsDisplay = new StatisticsDisplay(weatherData);
weatherData.SetMeasurements(30, 80, 50);
weatherData.SetMeasurements(15, 80, 0);
weatherData.SetMeasurements(25, 50, 0);
}
public void UpdateObservers()
{
WeatherData wd = new WeatherData();
IObserver fd = new ForecastDisplay(wd);
IObserver sd = new StatisticsDisplay(wd);
IObserver ccd = new CurrentConditionsDisplay(wd);
IObserver hi = new HeatIndexDisplay(wd);
wd.SetMeasurements(5.5f, 200f, 0.05f);
}
public void Main(string[] args)
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
weatherData.SetMeasurements(82, 70, 29.2f);
weatherData.SetMeasurements(78, 90, 29.2f);
}
static void Main(string[] args)
{
MeteoStationDelegate m = new MeteoStationDelegate();
var d1 = new ForecastDisplay();
var d2 = new AverageConditionDisplay();
m.AddDisplay(d1.Update); // Non si evoca il metodo Update ma l'indirizzo del metodo delegato, per questo non si usano le due parentesi;
m.AddDisplay(d2.Update);
m.Start();
}
static void Main(string[] args)
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
weatherData.setMeasurements(80, 65, 30.4f);
weatherData.setMeasurements(82, 70, 29.2f);
weatherData.setMeasurements(78, 90, 29.2f);
}
static void Main(string[] args)
{
var weatherData = new WeatherData();
var currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
var statisticsDisplay = new StatisticsDisplay(weatherData);
var forecastDisplay = new ForecastDisplay(weatherData);
var heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
weatherData.SetMeasurements(82, 70, 29.2f);
weatherData.SetMeasurements(78, 90, 29.2f);
}
static void Main(string[] args)
{
var data = new WeatherData();
var display1 = new CurrentConditionsDisplay(data);
var display2 = new ForecastDisplay(data);
var display3 = new StatisticsDisplay(data);
var display4 = new HeatIndexDisplay(data);
data.SetMeasurements(21.3f, 23.1f, 52.4f);
data.SetMeasurements(42.3f, 33.1f, 52.4f);
data.SetMeasurements(19.3f, 63.1f, 52.4f);
data.SetMeasurements(80.0f, 0.4f, 0f);
}
private static void ObserverPattern()
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.setMeasurements(80, 65, 30.4f);
weatherData.setMeasurements(82, 70, 29.2f);
weatherData.setMeasurements(78, 90, 29.2f);
}
public void Test_WeatherStationHeatIndex()
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.SetMeasurements(80, 65, 30.4f);
weatherData.SetMeasurements(82, 70, 29.2f);
weatherData.SetMeasurements(78, 90, 29.2f);
var result = statisticsDisplay.Display();
}
public ObserverPatternRunner()
{
rnd = new Random();
display = new ForecastDisplay();
general = new GeneralDisplay();
stats = new StatsDisplay();
station = new WeatherStation();
data = new WeatherData();
station.AddObserver(display);
station.AddObserver(general);
station.AddObserver(stats);
station.State = data;
}
public void weather_data_updates_forecast_correctly()
{
var wd = new WeatherData();
var display = new ForecastDisplay(wd);
wd.SetMeasurements(20, 15, 73);
Assert.AreEqual("Improving weather on the way!", display.Display());
wd.SetMeasurements(40, 15, 40);
Assert.AreEqual("Weather is getting bad!", display.Display());
wd.SetMeasurements(0, 15, 40);
Assert.AreEqual("More of the same", display.Display());
}
public static void Main()
{
WeatherData weatherData = new();
var currentDisplay = new CurrentConditionsDisplay(weatherData);
var statisticsDisplay = new StatisticsDisplay(weatherData);
var forecastDisplay = new ForecastDisplay(weatherData);
weatherData.SetMeasurements(new WeatherInfo(80, 65, 30.4f));
weatherData.SetMeasurements(new WeatherInfo(82, 70, 29.2f));
weatherData.SetMeasurements(new WeatherInfo(78, 90, 29.2f));
forecastDisplay.Unsubscribe();
weatherData.SetMeasurements(new WeatherInfo(62, 90, 28, 1f));
}
public void WeatherData_CanNotifyObservers()
{
WeatherData weatherData = new WeatherData();
IWeatherObserver statisticsDisplay = new StatisticsDisplay(weatherData);
IWeatherObserver forecastDisplay = new ForecastDisplay(weatherData);
IWeatherObserver conditionsDisplay = new CurrentConditionsDisplay(weatherData);
weatherData.SetMeasurements(10, 20, 30);
weatherData.RemoveObserver(statisticsDisplay);
weatherData.SetMeasurements(40, 50, 60);
weatherData.RemoveObserver(forecastDisplay);
weatherData.SetMeasurements(70, 80, 90);
weatherData.RemoveObserver(conditionsDisplay);
weatherData.SetMeasurements(100, 810, 910);
}
static void Main(string[] args)
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndexDisplay heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.SetMesurements(80, 65, 30.4f);
weatherData.SetMesurements(82, 70, 29.2f);
weatherData.SetMesurements(78, 90, 29.2f);
Console.ReadKey();
}
static void Main(string[] args)
{
var weatherData = new WeatherData();
var currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
var forecastDisplay = new ForecastDisplay(weatherData);
var statisticsDisplay = new StatisticsDisplay(weatherData);
var heatIndexDisplay = new HeatIndexDisplay(weatherData);
weatherData.MeasurmentsChanged(
new WeatherMeasurements()
{
Temperature = new Temperature()
{
TemperatureType = Temperature.TemperatureTypeEnum.Fahrenheit,
Value = 80
},
Humidty = 65.0,
Pressure = 30.4d
}
);
weatherData.MeasurmentsChanged(
new WeatherMeasurements()
{
Temperature = new Temperature()
{
TemperatureType = Temperature.TemperatureTypeEnum.Fahrenheit,
Value = 82
},
Humidty = 70.0,
Pressure = 27.2d
}
);
weatherData.MeasurmentsChanged(
new WeatherMeasurements()
{
Temperature = new Temperature()
{
TemperatureType = Temperature.TemperatureTypeEnum.Fahrenheit,
Value = 78
},
Humidty = 90.0,
Pressure = 29.2d
}
);
}
static void Main(string[] args)
{
Model.WeatherData weather = new Model.WeatherData();
var currentConditionsDisplay = new CurrentConditionDisplay(weather);
var statisticsDisplay = new StatisticsDisplay(weather);
var forecastDisplay = new ForecastDisplay(weather);
var heatIndex = new HeatIndexDisplay(weather);
weather.SetMeasurements(20, 10, 45);
weather.SetMeasurements(32, 60, 100);
statisticsDisplay = null;
forecastDisplay.UnregisterObserver();
weather.SetMeasurements(14, 80, 89);
Console.ReadKey();
}
private static void Main(string[] args)
{
// http://www.codeproject.com/Articles/88278/Observer-in-NET-with-IObserver-T
// http://www.dofactory.com/net/observer-design-pattern
WeatherData wd = new WeatherData();
CurrentConditionsDisplay d1 = new CurrentConditionsDisplay(wd);
StatisticsDisplay d2 = new StatisticsDisplay(wd);
ForecastDisplay d3 = new ForecastDisplay(wd);
wd.SetMeasurements(15, 20, 50);
Console.WriteLine();
wd.SetMeasurements(25, 10, 10);
Console.WriteLine();
wd.SetMeasurements(0, 50, 10);
Console.ReadKey();
}
public static void Run()
{
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
ForecastDisplay forecastDisplay = new ForecastDisplay(weatherData);
HeatIndex heatIndex = new HeatIndex(weatherData);
// Simulate new weather measurements
weatherData.SetMeasurements(80, 65, 30.4f);
Console.WriteLine();
weatherData.SetMeasurements(82, 70, 29.2f);
Console.WriteLine();
weatherData.SetMeasurements(78, 90, 29.2f);
Console.WriteLine();
}
private void RunObserverPatternExample()
{
var weather = new WeatherData();
var observers = new IWeatherObserver[2];
observers[0] = new CurrentWeatherDisplay();
observers[1] = new ForecastDisplay();
foreach (IWeatherObserver weatherObserver in observers)
{
weather.WeatherNotification += weatherObserver.UpdateWeatherDate;
}
weather.ChangeWeatherData();
DisplayHumidityInListBox(observers);
weather.ChangeWeatherData();
DisplayHumidityInListBox(observers);
}
public static void Main(string[] args)
{
WeatherStation weatherStation = new WeatherStation();
GeneralDisplay subscriber1 = new GeneralDisplay(weatherStation);
weatherStation.MeasurementsChanged(20, 770, 50);
ForecastDisplay subscriber2 = new ForecastDisplay(weatherStation);
weatherStation.MeasurementsChanged(18, 769, 54);
weatherStation.Unsubscribe(subscriber2);
weatherStation.MeasurementsChanged(15, 750, 78);
weatherStation.Unsubscribe(subscriber1);
weatherStation.MeasurementsChanged(14, 745, 90);
weatherStation.Subscribe(subscriber1);
weatherStation.MeasurementsChanged(13, 740, 99);
}
public void weather_data_updates_observers_correctly()
{
var wd = new WeatherData();
var conditions = new CurrentConditionsDisplay(wd);
var heat = new HeatIndexDisplay(wd);
var stats = new StatisticsDisplay(wd);
var forecast = new ForecastDisplay(wd);
wd.SetMeasurements(80, 65, 30.4f);
Assert.AreEqual("Current Conditions: 80 celsius and humidity 65", conditions.Display());
Assert.AreEqual("Heat index is 82.95535", heat.Display());
Assert.AreEqual("Avg/Max/Min Temperature: 80/80/80", stats.Display());
Assert.AreEqual("Improving weather on the way!", forecast.Display());
wd.SetMeasurements(78, 90, 29.2f);
Assert.AreEqual("Current Conditions: 78 celsius and humidity 90", conditions.Display());
Assert.AreEqual("Heat index is 83.64967", heat.Display());
Assert.AreEqual("Avg/Max/Min Temperature: 79/80/78", stats.Display());
Assert.AreEqual("Weather is getting bad!", forecast.Display());
}
public static void Main(string[] args)
{
WeatherMonitor monitor = new WeatherMonitor();
ForecastDisplay forecast = new ForecastDisplay();
CurrentConditionsDisplay currentConditions = new CurrentConditionsDisplay();
StatisticsDisplay statistics = new StatisticsDisplay();
HeatIndexDisplay heatIndex = new HeatIndexDisplay();
monitor.SetMeasurments(new WeatherData(80, 65, 30.4f));
forecast.Subscribe(monitor);
currentConditions.Subscribe(monitor);
statistics.Subscribe(monitor);
heatIndex.Subscribe(monitor);
monitor.SetMeasurments(new WeatherData(82, 70, 29.2f));
statistics.Unsubscribe();
monitor.SetMeasurments(new WeatherData(78, 90, 29.2f));
monitor.SetMeasurments(null);
//weatherData.SetMeasurments(82, 70, 29.2f);
//weatherData.SetMeasurments(78, 90, 29.2f);
Console.ReadLine();
}
