private void BeginOperation()
{
string path = m_ProvideHandle.ResourceManager.TransformInternalId(m_ProvideHandle.Location);
string bundleName = Path.GetFileName(path);
m_bundleOffset = computeBundleOffset(bundleName);
path = AssetBundleMgr.GetInstance().TransformAssetBundleLocation(path, bundleName, m_Options.Hash);
if (File.Exists(path) || !ResourceManagerConfig.IsPathRemote(path))
{
//如果文件存在 情况 1、Editor模式下文件存在 2、persistent下的文件存在 3、streaming asset目录下
m_RequestOperation = AssetBundle.LoadFromFileAsync(path, m_Options == null ? 0 : m_Options.Crc, (ulong)m_bundleOffset);
m_RequestOperation.completed += LocalRequestOperationCompleted;
}
else if (AssetBundleMgr.GetInstance().IsCached(bundleName, m_Options.Hash))
{
//persistent目录下ab是否存在，是否有缓存
string cachePath = AssetBundleMgr.GetInstance().getCachedAssetBundlePath(bundleName);
m_RequestOperation = AssetBundle.LoadFromFileAsync(cachePath, m_Options == null ? 0 : m_Options.Crc, (ulong)m_bundleOffset);
m_RequestOperation.completed += LocalRequestOperationCompleted;
}
else if (ResourceManagerConfig.ShouldPathUseWebRequest(path))
{
// 文件真的需要从网络上下载
var req = CreateWebRequest(path);
req.disposeDownloadHandlerOnDispose = false;
m_WebRequestQueueOperation = WebRequestQueue.QueueRequest(req);
if (m_WebRequestQueueOperation.IsDone)
{
m_RequestOperation = m_WebRequestQueueOperation.Result;
m_RequestOperation.completed += WebRequestOperationCompleted;
}
else
{
m_WebRequestQueueOperation.OnComplete += asyncOp =>
{
m_RequestOperation = asyncOp;
m_RequestOperation.completed += WebRequestOperationCompleted;
};
}
}
else
{
m_RequestOperation = null;
m_ProvideHandle.Complete <AssetBundleEncryptResource>(null, false, new Exception(string.Format("Invalid path in AssetBundleEncryptResource: '{0}'.", path)));
}
}
public static WebRequestQueueOperation QueueRequest(UnityWebRequest request)
{
WebRequestQueueOperation queueOperation = new WebRequestQueueOperation(request);
if (s_ActiveRequests.Count < s_MaxRequest)
{
var webRequestAsyncOp = request.SendWebRequest();
webRequestAsyncOp.completed += OnWebAsyncOpComplete;
s_ActiveRequests.Add(webRequestAsyncOp);
queueOperation.Complete(webRequestAsyncOp);
}
else
{
s_QueuedOperations.Enqueue(queueOperation);
}
return(queueOperation);
}