How to know when all users leave a room using the server-to-server API

[Former Community Member]

What should I subscribe to with the server-to-server API to receive a callback when there are no users in a room or when all users have left a room. From the client, I'm able to look at connectSession.userManager.userCollection, but is there a way to subscribe to this on the server side? Also, could you tell me the name of the collectionNode/node that I should be subscribing too?

[Former Community Member · Accepted solution]

Hi,

On the server side , we don't have by default any code that will tell you if all users have left or not. You would need to build that logic in your server code by yourself. You have to first subscribe to the "UserManager" collection as "UserManager" is the name of UserManager collection node.

Once you do that, you would always get any item that is published on this collection in your 'receiveItem' hook function.

Now, whenever you get an item on the node called "UserList" under this collection , it means either an user has entered or exited or some user's userDescriptor has been modified.

Thus from any item on UserList, you can build a bookkeeping of the list of users on your server side code and whenever you get an item, you can check if your bookkeeping list is empty or not and if so, there is no user in that room.

We do it similarly on the client side too( you can refer to the onItemReceive function in UserManager.as ).

Hope this solves your issue

Thanks

Hironmay Basu