AssetLoadService.cs

using System;
using Simulation.Data;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;

namespace Game.AssetLoading
{
    public interface IAssetLoadService
    {
        void LoadAsset<T>(AssetType assetType, EntityType entityType, Action<T> onLoadedCallback);
    }
    /// <summary>
    /// This class handles finding and loading game assets asynchronously.
    /// It uses Unity's <see cref="Addressables"/> for this.
    /// It identifies the assets via <see cref="AssetType"/> and <see cref="EntityType"/> enums.
    ///
    /// When the assets have been loaded it invokes the onLoadedCallback callback.
    /// </summary>
    public class AssetLoadService : IAssetLoadService
    {
        public void LoadAsset<T>(AssetType assetType, EntityType entityType, Action<T> onLoadedCallback)
        {
            // Load the asset with the given address (key) and call OnLoaded when it's done
            Addressables.LoadAssetAsync<T>($"{assetType.ToString()}/{entityType.ToString()}").Completed += OnLoaded;

            void OnLoaded(AsyncOperationHandle<T> handle)
            {
                // Invoke the callback and pass the asset back
                onLoadedCallback.Invoke(handle.Result);
            }
        }
    }
}