com.unity.services.samples.game-lobby/Assets/Scripts/GameLobby/Game/LocalLobbyList.cs

using System;
using System.Collections.Generic;

namespace LobbyRelaySample
{
    /// <summary>
    /// Used when displaying the lobby list, to indicate when we are awaiting an updated lobby query.
    /// </summary>
    public enum LobbyQueryState
    {
        Empty,
        Fetching,
        Error,
        Fetched
    }

    /// <summary>
    /// Holds data related to the Lobby service itself - The latest retrieved lobby list, the state of retrieval.
    /// </summary>
    [System.Serializable]
    public class LocalLobbyList
    {
        public CallbackValue<LobbyQueryState> QueryState = new CallbackValue<LobbyQueryState>();

        public Action<Dictionary<string, LocalLobby>> onLobbyListChange;
        Dictionary<string, LocalLobby> m_currentLobbies = new Dictionary<string, LocalLobby>();

        /// <summary>
        /// Maps from a lobby's ID to the local representation of it. This allows us to remember which remote lobbies are which LocalLobbies.
        /// Will only trigger if the dictionary is set wholesale. Changes in the size or contents will not trigger OnChanged.
        /// </summary>
        public Dictionary<string, LocalLobby> CurrentLobbies
        {
            get { return m_currentLobbies; }
            set
            {
                m_currentLobbies = value;
                onLobbyListChange?.Invoke(m_currentLobbies);
            }
        }
    }
}