Introduce & Implement data monitoring contracts

Author: izzat5233

RealTimeWeatherMonitoringApp/Application/Interfaces/IDataChangeNotifier.cs

@@ -0,0 +1,12 @@
+using RealTimeWeatherMonitoringApp.Domain.Common;
+
+namespace RealTimeWeatherMonitoringApp.Application.Interfaces;
+
+/// <summary>
+/// Notifies subscribers about changes in data of type <typeparamref name="TObserved"/>.
+/// </summary>
+/// <typeparam name="TObserved">The observed data type.</typeparam>
+public interface IDataChangeNotifier<TObserved>
+{
+    event EventHandler<DataChangeEventArgs<TObserved>> OnDataChange;
+}

RealTimeWeatherMonitoringApp/Application/Interfaces/IDataReceiver.cs

@@ -0,0 +1,10 @@
+namespace RealTimeWeatherMonitoringApp.Application.Interfaces;
+
+/// <summary>
+/// Defines the ability to receive data of type <typeparamref name="TReceived"/>.
+/// </summary>
+/// <typeparam name="TReceived">The received data type.</typeparam>
+public interface IDataReceiver<in TReceived>
+{
+    void Receive(TReceived data);
+}

RealTimeWeatherMonitoringApp/Application/Service/MonitoringService.cs

@@ -0,0 +1,12 @@
+using RealTimeWeatherMonitoringApp.Application.Interfaces;
+using RealTimeWeatherMonitoringApp.Domain.Common;
+
+namespace RealTimeWeatherMonitoringApp.Application.Service;
+
+public class MonitoringService<TData> : IDataReceiver<TData>, IDataChangeNotifier<TData>
+{
+    public void Receive(TData data) =>
+        OnDataChange?.Invoke(this, new DataChangeEventArgs<TData>(data));
+
+    public event EventHandler<DataChangeEventArgs<TData>>? OnDataChange;
+}