// 2. Observer Pattern
private static void RunObserverPatternDemo()
{
WeatherPublisher weatherPublisher = new WeatherPublisher();
ISubscriber currentConditionDisplay = new CurrentConditionsDisplay(weatherPublisher);
ISubscriber statisticalDisplay = new StatisticalDisplay(weatherPublisher);
Console.WriteLine("Set Weather the first time");
weatherPublisher.SetWeatherStats(0, 0, 0);
Console.WriteLine();
Console.WriteLine("Set Weather the second time");
weatherPublisher.SetWeatherStats(1, 1, 1);
Console.WriteLine();
Console.WriteLine("Unsubscribe Current Condition Display");
currentConditionDisplay.UnSubscribe();
Console.WriteLine("Set Weather the third time");
weatherPublisher.SetWeatherStats(2, 2, 2);
Console.WriteLine();
Console.WriteLine("Unsubscribe Current Statistical Display");
statisticalDisplay.UnSubscribe();
Console.WriteLine("Set Weather the fourth time");
weatherPublisher.SetWeatherStats(3, 3, 3);
Console.WriteLine();
}
public async Task Test_verify_publisher_submit_data_called()
{
var data = string.Join(Environment.NewLine, new[]
{
"Kochi",
"30"
});
Console.SetIn(new StringReader(data));
var publisher = new WeatherPublisher(_mockWeatherChannel.Object);
_mockWeatherChannel.Setup(t => t.ProcessInputDataAsync(It.IsAny <WeatherData>())).Verifiable();
await publisher.PublishDataAsync();
_mockWeatherChannel.Verify(t => t.ProcessInputDataAsync(It.IsAny <WeatherData>()), Times.Once);
}
static async Task Main(string[] args)
{
do
{
IWeatherChannel weatherChannel = new WeatherChannel();
var subscriber1 = new WeatherSubscriber("Subscriber 1", weatherChannel);
var subscriber2 = new WeatherSubscriber("Subscriber 2", weatherChannel);
WeatherPublisher publisher = new WeatherPublisher(weatherChannel);
await publisher.PublishDataAsync();
subscriber1.UnSubscribe();
var subscriber3 = new WeatherSubscriber("Subscriber 3", weatherChannel);
await publisher.PublishDataAsync();
subscriber2.UnSubscribe();
subscriber3.UnSubscribe();
Console.WriteLine("Do you want to continue (Y/N)? ");
} while (Console.ReadLine().ToUpper() == "Y");
}
