In SignalR is Hub.Context thread safe?

Question

If there is more than one request occurring from different clients simultaneously then the value of Hub.Context.ConnectionId changes during the execution of the handler.

Say I've got 2 clients connected with client Ids A and B, and I've got a method on my Hub called foo(). I send a request from A to the Server invoking foo(), then whilst the request from A is being processed I send a request from B invoking foo(). At the start of the processing of A's request Hub.Context.ConnectionId == A but at the end of the method call Hub.Context.ConnectionId == B.

Should I be copying the Hub.Context? At what point should I do this?

Answer 1

It doesn't need to be thread safe since Hub instances aren't static so you don't need to copy anything.

They are created per call. So each call from the client will create a new Hub instance and HubContext.

Answer 2

This doesn't directly answer your question, but my usual workflow is to set a value on the caller when they first connect, which may accomplish what you need?

Caller.clientId = Guid.NewGuid();