AssetBundleManagerのwwwをUnityWebRequestに変えて、さらにキャッシュの古いバージョンを削除してみる

環境

Unity2017.1.0f3

概要

wwwは使用しないでUnityWebRequestを使用したほうがいいらしいのでテスト
また、Caching.ClearOtherCachedVersionsを使用して、キャッシュの古いバージョンを削除します

変更箇所

        // Where we actuall call WWW to download the assetBundle.
        static protected bool LoadAssetBundleInternal (string assetBundleName, bool isLoadingAssetBundleManifest)
        {
            // Already loaded.
            LoadedAssetBundle bundle = null;
            m_LoadedAssetBundles.TryGetValue(assetBundleName, out bundle);
            if (bundle != null)
            {
                bundle.m_ReferencedCount++;
                return true;
            }

            // @TODO: Do we need to consider the referenced count of WWWs?
            // In the demo, we never have duplicate WWWs as we wait LoadAssetAsync()/LoadLevelAsync() to be finished before calling another LoadAssetAsync()/LoadLevelAsync().
            // But in the real case, users can call LoadAssetAsync()/LoadLevelAsync() several times then wait them to be finished which might have duplicate WWWs.
            if (m_DownloadingWWWs.ContainsKey(assetBundleName) )
                return true;

        //  WWW download = null;
            UnityWebRequest download = null;
            string url = m_BaseDownloadingURL + assetBundleName;

            // For manifest assetbundle, always download it as we don't have hash for it.
            if (isLoadingAssetBundleManifest)
            //  download = new WWW(url);
                download = UnityWebRequest.GetAssetBundle( url );
            else
            {
                download = UnityWebRequest.GetAssetBundle( url, m_AssetBundleManifest.GetAssetBundleHash(assetBundleName), 0 );
                //Unity2017 バージョン違いを消す
                if( Caching.ClearOtherCachedVersions( assetBundleName, m_AssetBundleManifest.GetAssetBundleHash(assetBundleName ) ) == false )
                    Debug.LogWarning( "ClearOtherCachedVersions" );
            }
            //  download = WWW.LoadFromCacheOrDownload(url, m_AssetBundleManifest.GetAssetBundleHash(assetBundleName), 0); 
            download.Send();
            m_DownloadingWWWs.Add(assetBundleName, download);

            return false;
        }

        void Update()
        {
            // Collect all the finished WWWs.
            var keysToRemove = new List<string>();
            foreach (var keyValue in m_DownloadingWWWs)
            {
            //  WWW download = keyValue.Value;
                var download = keyValue.Value;

                // If downloading fails.
                if (download.error != null)
                {
                    m_DownloadingErrors.Add(keyValue.Key, string.Format("Failed downloading bundle {0} from {1}: {2}", keyValue.Key, download.url, download.error));
                    keysToRemove.Add(keyValue.Key);
                    continue;
                }

                // If downloading succeeds.
                if(download.isDone)
                {
                //  AssetBundle bundle = download.assetBundle;
                    AssetBundle bundle = ((DownloadHandlerAssetBundle)download.downloadHandler).assetBundle;
                    if (bundle == null)
                    {
                        m_DownloadingErrors.Add(keyValue.Key, string.Format("{0} is not a valid asset bundle.", keyValue.Key));
                        keysToRemove.Add(keyValue.Key);
                        continue;
                    }

                    //Debug.Log("Downloading " + keyValue.Key + " is done at frame " + Time.frameCount);
                //  m_LoadedAssetBundles.Add(keyValue.Key, new LoadedAssetBundle( download.assetBundle ) );
                    m_LoadedAssetBundles.Add(keyValue.Key, new LoadedAssetBundle( bundle ) );
                    keysToRemove.Add(keyValue.Key);

                    //Unity2017キャッシュの確認
                    var currentCache = Caching.currentCacheForWriting;
                    var versions = new List<Hash128>();
                    var assetbundleName = Path.GetFileName( download.url );
                    Caching.GetCachedVersions( assetbundleName, versions );
                    Debug.Log( "CacheVersionCount:" + bundle.name + ":" + versions.Count );
                    Debug.Log( "CachePath:" + currentCache.path );
                    Debug.Log( "CacheSize:" + currentCache.spaceOccupied + "/" + currentCache.maximumAvailableStorageSpace );
                }
            }

            // Remove the finished WWWs.
            foreach( var key in keysToRemove)
            {
            //  WWW download = m_DownloadingWWWs[key];
                var download = m_DownloadingWWWs[key];
                m_DownloadingWWWs.Remove(key);
                download.Dispose();
            }

            // Update all in progress operations
            for (int i=0;i<m_InProgressOperations.Count;)
            {
                if (!m_InProgressOperations[i].Update())
                {
                    m_InProgressOperations.RemoveAt(i);
                }
                else
                    i++;
            }
        }