private static void CacheItem_Remove(string postBackID, object val, CacheItemRemovedReason reason)
{
UploadStateStoreProvider.CleanUpIfStaleCallback cleanUpIfStaleCallback
= (UploadStateStoreProvider.CleanUpIfStaleCallback)val;
if (reason == CacheItemRemovedReason.Removed)
{
return;
}
cleanUpIfStaleCallback(postBackID);
}
private static void DeleteAfterDelay(UploadState uploadState)
{
HttpContext ctx = HttpContext.Current;
UploadStateStoreProvider.CleanUpIfStaleCallback cleanUpIfStaleCallback
= Provider.GetCleanUpIfStaleCallback();
ctx.Cache.Insert(uploadState.PostBackID, cleanUpIfStaleCallback, null,
Cache.NoAbsoluteExpiration,
TimeSpan.FromSeconds(Config.Current.StateStaleAfterSeconds),
CacheItemPriority.High,
new CacheItemRemovedCallback(CacheItem_Remove));
}
/// <summary>
/// Returns an <see cref="IUploadState"/> for a given post-back ID.
/// or creates one if none exists.
/// </summary>
/// <param name="postBackID">
/// A post-back ID identifying the <see cref="IUploadState"/>.
/// </param>
/// <returns>
/// The <see cref="IUploadState"/> corresponding to
/// <paramref name="postBackID"/>
/// </returns>
public static UploadState OpenReadWriteOrCreate(string postBackID)
{
UploadState uploadState = OpenReadWrite(postBackID);
if (uploadState != null && !uploadState.IsMultiRequest &&
HttpContext.Current != null &&
HttpContext.Current.Items["NeatUpload_CalledOpenReadWriteOrCreate"] == null)
{
// This is not a multi-request upload and this is the first time
// we've been called during this request, so the uploadState we
// found must be from a previous postback with the same postback ID.
// That can happen if the user has scripting disabled and the current
// postback is from a cached page. So, we need to delete the old
// upload state and pretend we didn't get it.
// Make it stale and save it so it can be cleaned up
uploadState.TimeOfLastMerge = DateTime.MinValue;
MergeAndSave(uploadState);
// Clean it up
UploadStateStoreProvider.CleanUpIfStaleCallback cleanUpIfStaleCallback
= Provider.GetCleanUpIfStaleCallback();
cleanUpIfStaleCallback(postBackID);
// Pretend we didn't get it
uploadState = null;
// Don't do the above again during this request.
HttpContext.Current.Items["NeatUpload_CalledOpenReadWriteOrCreate"] = true;
}
if (uploadState == null)
{
uploadState = new UploadState(postBackID);
uploadState.Changed += new EventHandler(UploadState_Changed);
uploadState.DeleteAfterDelayWhenNotOpenReadWrite = true;
}
uploadState.IsWritable = true;
return(uploadState);
}
