/** Queues {@code player} for logout on the next tick. */
public void queueLogout(Player player) {
if (player.getState() == EntityState.ACTIVE && !logouts.contains(player)) {
logouts.add(player);
}
}
/** Queues {@code player} for login on the next tick. */
public void queueLogin(Player player) {
if (player.getState() == EntityState.IDLE && !logins.contains(player)) {
logins.add(player);
}
}