Question: how does AuthenticatorService tracks per user signin info ?

[nkmittal]

I am using this repo for authentication. Here is my understanding before I describe my question:

1. By default it is using stateless Cookie approach where the Cookie is not stored at the server.
2. When client sends the request with the Cookie then in Auth.scala the Cookie is validated using AuthenticatorService.
3. On signOut the authenticator is discarded.

My question:
Where is the object for AuthenticatorService for each user stored ? I don't see any storage defined anywhere for this.
Refer these two code snippets:
Inside method Auth.scala:authenticate

for {
                authenticator <- env.authenticatorService.create(loginInfo).map(authenticatorWithRememberMe(_, rememberMe))
                cookie <- env.authenticatorService.init(authenticator)
                result <- env.authenticatorService.embed(cookie, Redirect(targetUri).withSession(request.session - "ENTRY_URI"))

Inside method Auth.scala:signOut
env.authenticatorService.discard(request.authenticator, Redirect(routes.Application.index))

Thanks.
Nikhil