private const int MaxTryNum = 3; // 最多重试次数
private void Update( )
{
// 下载量充足，增加新的下载
if (_loadingQueue.Count < MaxWorkingCnt)
{
int cnt = MaxWorkingCnt - _waitingQueue.Count;
for (int i = 0; i < cnt; i++)
{
if (_waitingQueue.Count <= 0)
{
break;
}
string url = _waitingQueue.Dequeue( );
_loadingQueue.Add(new LoadingAbInfo(url));
}
}
// 检查下载状态
for (var index = _loadingQueue.Count - 1; index >= 0; index--)
{
LoadingAbInfo info = _loadingQueue[index];
if (info.State == LoadStateType.Loding)
{
continue;
}
// 三次都没有下载下来
if (info.ErrorCount >= MaxTryNum)
{
GameLogger.GetInstance( )
.Output(string.Format("!!!!! AssetBundle CreateFromWWW failed: {0}\n\t ErrorCount >= {1}",
info.Url, MaxTryNum));
_loadingQueue.RemoveAt(index);
continue;
}
StartCoroutine(OnAssetLoadStart(info));
}
// 检查request的完成情况
List <string> tmpKeys = new List <string>(_requests.Keys);
foreach (var one in tmpKeys)
{
AsyncLoadRequest request = _requests[one];
if (request.CompletedCallback( ))
{
_requests.Remove(one);
}
}
}
private IEnumerator OnAssetLoadStart(LoadingAbInfo info)
{
#if TRACE
//float timeBegin = Time.realtimeSinceStartup;
//GameLogger.GetInstance().Trace( "AssetBundle CreateFromWWW Star: {0}", info.Url );
#endif
info.State = LoadStateType.Loding;
yield return(null);
var url = MakeUrl(info.Url);
WWW www = new WWW(url);
while (!www.isDone)
{
info.Progress = www.progress;
yield return(null);
}
// 加载失败了
if (!string.IsNullOrEmpty(www.error))
{
GameLogger.GetInstance( ).Trace("AssetBundle CreateFromWWW failed: {0}\n\t{1}", url, www.error);
UrlLoadCompleted(info, null);
yield break;
}
AssetBundle ab = www.assetBundle;
if (ab == null)
{
GameLogger.GetInstance( ).Trace("AssetBundle CreateFromWWW failed: {0}\n\tab == null", url);
UrlLoadCompleted(info, null);
yield break;
}
#if TRACE
//GameLogger.GetInstance().Trace( "### Load {0} successful, time = {1}", info.Url, Time.realtimeSinceStartup - timeBegin );
#endif
UrlLoadCompleted(info, ab);
}
private void UrlLoadCompleted(LoadingAbInfo info, AssetBundle ab)
{
if (ab == null)
{
if (info.ErrorCount >= MaxTryNum)
{
}
else
{
// 再试几次下载
info.State = LoadStateType.Start;
info.ErrorCount += 1;
}
//GameLogger.GetInstance( ).Debug( "!!!!! Failed..UrlLoadCompleted:" + info.Url );
return;
}
GameLogger.GetInstance( ).Debug("UrlLoadCompleted:" + info.Url);
// 缓存起来
_cacheMgr.Add(info.Url, ab);
// 修改下载数据状态
info.State = LoadStateType.Completed;
// 通知Request，有一个AB下载完成
if (!_loadedCallback.ContainsKey(info.Url))
{
throw new Exception($"!!!UrlLoadCompleted failed. Url:{info.Url}");
}
// 回调
_loadedCallback[info.Url].DynamicInvoke(info.Url, ab);
_loadedCallback.Remove(info.Url);
// 加载完成
_loadingQueue.Remove(info);
}