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);
}
}
}
public void CreateDependsReques(string url, string mainUrl)
{
// 注册一个回调
AsyncLoadRequest request = _requests[mainUrl];
if (request == null)
{
throw new Exception("CreateDependsReques AsyncLoadRequest == null");
}
RegisterLoadedCallBack(url, request.UrlLoadedCallBack);
// 没有正在下载的相同url，排个队
if (!IsLoading(url))
{
_waitingQueue.Enqueue(url);
}
}
private void CreateRequest(string url, AsyncLoadCallBack.CallBack onAsyncRequestCallBack, object context)
{
// ①：先创建一个回调
AsyncLoadCallBack callbackFun = new AsyncLoadCallBack(onAsyncRequestCallBack, context);
// ③是否已有加载数据，已有，注册一个回调函数，等待返回
if (_requests.ContainsKey(url))
{
_requests[url].Callbacks.Add(callbackFun);
return;
}
// ②：没有加载相关数据，新建一个异步请求，注册一个回调函数
// url可能已存在于缓存，需要请求的是依赖项
AsyncLoadRequest request =
new AsyncLoadRequest(url, AssetBundleMgr.GetInstance( ).GetAbDependencies(url));
request.Callbacks.Add(callbackFun);
_requests.Add(url, request);
AssetBundle ab = GetAb(url);
if (ab == null)
{
RegisterLoadedCallBack(url, request.UrlLoadedCallBack);
}
else
{
// 主ab包已经加载了，需要加载的是依赖包
string depsUrl = request.GetUnLoadUrl( );
RegisterLoadedCallBack(depsUrl, request.UrlLoadedCallBack);
url = depsUrl;
}
// ④：没有正在下载的相同url，排个队
if (!IsLoading(url))
{
_waitingQueue.Enqueue(url);
}
}
