Provide support for factory method for building a derived instance of ConnectionHandler

I am using ServerBuilder UseConnectionHandler to build my Server class. I would like to resolve connection handler class from an external container (Castle Windsor) in order to be able to inject dependencies in my ConnectionHandler. I cannot find a way in the library’ ServerBuilder API to resolve an instance of ConnectionHandler externally at client connect time

Is it feasible to use a factory method for resolving connection handlers?

[JanEggers]

this is the original code: https://github.com/aspnet/AspNetCore/blob/c17ce436b8703470231e7979cead042f5682c3f5/src/Servers/Connections.Abstractions/src/ConnectionBuilderExtensions.cs#L12-L18

you could add your own like:

public static IConnectionBuilder UseConnectionHandler<TConnectionHandler>(this IConnectionBuilder connectionBuilder, Func<TConnectionHandler> factory) where TConnectionHandler : ConnectionHandler
        {
            var handler = factory():

            // This is a terminal middleware, so there's no need to use the 'next' parameter
            return connectionBuilder.Run(connection => handler.OnConnectedAsync(connection));
        }

I think this method does not provide enough value to be in the box.

For my usage, clearly a much better way would be to instantiate ConnectionHandler on each new client connection.

in the end it is just a middleware you can create your own on each connection like:

        public static IConnectionBuilder UseWhateverHandler <TConnectionHandler>(this IConnectionBuilder connectionBuilder, Func<TWhateverHandler > factory) where TWhateverHandler : WhateverHasNext
        {
            return connectionBuilder.Run(connection => factory().Whatever(connection));
        } 

[davidfowl]

@JanEggers what you suggested in cleaner.

public static IConnectionBuilder UseWhateverHandler<TConnectionHandler>(this IConnectionBuilder connectionBuilder, Func<TWhateverHandler> factory) where TWhateverHandler : WhateverHasNext
{
   return connectionBuilder.Run(connection => factory().Whatever(connection));
}