Is it possible to create a separate Spring Socket for predefined people?

Question

Spring

I'm developing an application that allows people the ability to create a room or join an existing one.
When a certain number of people are reached, all the people in the room must start playing together.

The server has Map<id, users>, with the room id and the users in it, respectively (their WebSocketSession is stored in the user).

1) Is it possible to create a separate socket for this group of people when filling the room to the maximum in Spring Framework?

2) Is there a difference between creating a separate socket for each group of people and creating a general socket that will handle all groups at once?