Handler is a basic mechanism of processing incoming messages from a bus
Example

public class AiHandler : IHandler<SendMessageRequest, SendMessageResponse>
{
   private readonly ILogger<AiHandler> _logger;
   private readonly IAiProvider _provider;

   public AiHandler(IAiProvider provider, ILogger<AiHandler> logger)
   {
       _provider = provider;
       _logger = logger;
   }

   /// <inheritdoc />
   public async Task Handle(SendMessageRequest input, CancellationToken token)
   {
       try
       {
           await _provider.SendAsync(new AiMessage(input.Uid)
                                     {
                                         ChatId = input.Message.ChatId,
                                         Body = input.Message.Body,
                                         Subject = input.Message.Subject,
                                         ReplyToMessageUid = input.Uid
                                     },
                                     token);
       }
       catch (Exception ex)
       {
           _logger.LogError($"Error while handling a message from AI backend: {ex.Message}", ex);
       }
   }
}
Handlers

Example
