Mediator work

Framework/Foundation/Lifecycles/CommandClassHandlerWrapper.cs

@@ -0,0 +1,25 @@
+using Mediator;
+
+namespace Toolkit.Framework.Foundation;
+
+public class CommandClassHandlerWrapper<TRequest, TResponse> where TRequest : class, ICommand<TResponse>
+{
+    private readonly MessageHandlerDelegate<TRequest, TResponse> handler;
+
+    public CommandClassHandlerWrapper(ICommandHandler<TRequest, TResponse> concreteHandler, 
+        IEnumerable<IPipelineBehavior<TRequest, TResponse>> pipelineBehaviours)
+    {
+        MessageHandlerDelegate<TRequest, TResponse> handler = concreteHandler.Handle;
+
+        foreach (IPipelineBehavior<TRequest, TResponse>? pipeline in pipelineBehaviours.Reverse())
+        {
+            MessageHandlerDelegate<TRequest, TResponse> handlerCopy = handler;
+            IPipelineBehavior<TRequest, TResponse> pipelineCopy = pipeline;
+            handler = (TRequest message, CancellationToken cancellationToken) => pipelineCopy.Handle(message, cancellationToken, handlerCopy);
+        }
+
+        this.handler = handler;
+    }
+
+    public ValueTask<TResponse> Handle(TRequest request, CancellationToken cancellationToken) => handler(request, cancellationToken);
+}