Toolkit2/Toolkit.Foundation/Configurations/WriteHandler.cs

using Mediator;

namespace Toolkit.Foundation
{
    public class WriteHandler<TConfiguration> : IRequestHandler<Write<TConfiguration>> where TConfiguration : class
    {
        private readonly IMediator mediator;
        private readonly TConfiguration configuration;
        private readonly IConfigurationWriter<TConfiguration> writer;

        public WriteHandler(TConfiguration configuration,
            IConfigurationWriter<TConfiguration> writer,
            IMediator mediator)
        {
            this.mediator = mediator;
            this.configuration = configuration;
            this.writer = writer;
        }

        public async ValueTask<Unit> Handle(Write<TConfiguration> request, CancellationToken cancellationToken)
        {
            request.UpdateDelegate.Invoke(configuration);
            writer.Write(request.Section, configuration);

            await mediator.Send(new ConfigurationChanged<TConfiguration>(configuration), cancellationToken);

            return default;
        }
    }
}