在圆形物体上收集垃圾？

Question

In my ws node.js server, I have it so that when a client connects, it assigns a "user" object to their websocket object, and inside that user object is a reference back to their websocket object. This lets me send data to a client when I only know their user object (all game logic only deals in user objects, not websockets), and it lets me get a client's user information when data comes in from their websocket object.

I've heard that circular objects can cause issues where garbage collection will never clean them up because they have references to each other, so my question is, what do I need to do to make sure that when a client disconnects, their websocket and user objects both get properly removed from memory?

Also, let me know if I'm going about this in completely the wrong way! :P

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Edit: Code:

function onConnect(client) {
    users.push({connected: true, client: client, name: "", messages: 0});
    client.user = users[users.length - 1];
    send("Please enter a username.", [client.user]);
}

Answer 1

You have to manually remove closed connections from the list. Otherwise, garbage collector will not remove them from memory.

function onConnect(client) {
  users.push({
    connected: true,
    client: client,
    name: "",
    messages: 0
  });
  client.user = users[users.length - 1];
  client.on('close', function(){
    //remove closed connection from the list then let garbage collector does its job.
    users.splice(users.indexOf(client.user), 1);
  });
  send("Please enter a username.", [client.user]);
}