public class AsyncMediatorPipeline<TRequest, TResponse> : IAsyncRequestHandler<TRequest, TResponse> where TRequest : IAsyncRequest<TResponse>
    {

        private readonly IAsyncRequestHandler<TRequest, TResponse> inner;
        private readonly IAsyncPreRequestHandler<TRequest>[] preRequestHandlers;
        private readonly IAsyncPostRequestHandler<TRequest, TResponse>[] postRequestHandlers;

        public AsyncMediatorPipeline(IAsyncRequestHandler<TRequest, TResponse> inner, IAsyncPreRequestHandler<TRequest>[] preRequestHandlers, IAsyncPostRequestHandler<TRequest, TResponse>[] postRequestHandlers)
        {
            this.inner = inner;
            this.preRequestHandlers = preRequestHandlers;
            this.postRequestHandlers = postRequestHandlers;
        }

        public async Task<TResponse> Handle(TRequest message)
        {
            foreach (var preRequestHandler in preRequestHandlers)
            {
                 await preRequestHandler.Handle(message);
            }

            var result = await inner.Handle(message);

            foreach (var postRequestHandler in postRequestHandlers)
            {
                await postRequestHandler.Handle(message, result);
            }
            return result;
        }
    }