internal void NotifyCommitComplete(AsyncCommitInfo asyncCommitInfo)
{
if (asyncCommitInfo.VirtualizedItemInfos.Length < 1)
{
throw new DataGridInternalException();
}
int indexForItemInPage = asyncCommitInfo.VirtualizedItemInfos[0].Index;
// We do not want to move the page we are about flag has committed to the front since it does not count as a legitimate user-access.
// It will get moved to the front when one of its items is accessed.
VirtualPage page = null;
page = this.GetPageOrDefaultForItemIndex(indexForItemInPage, true);
if (page == null)
{
throw new InvalidOperationException("An attempt was made to retrieve a page does not exist.");
}
if ((!this.HasPagePendingCommit) || (!page.IsCommitPending))
{
throw new InvalidOperationException("An attempt was made to commit a page that does not have a pending commit operation.");
}
Debug.Assert(page.IsDirty);
page.EndCommitItems(asyncCommitInfo);
// If we no longer have any pages pending commit.
if (!this.HasPagePendingCommit)
{
// CleanUp and queue a request to fill empty pages from the start of the queue.
m_pagingManager.CleanUpAndDisposeUnused();
// This is a failsafe, to make sure that during the clean-up other commit were not queued.
if (!this.HasPagePendingCommit)
{
if (!this.IsRestarting)
{
// After the call to cleanup, there should only be LOCKED pending fill pages remaining. Those are the one to refetch.
List <VirtualPage> lockedPages = this.GetLockedPages();
int lockedPageCount = lockedPages.Count;
for (int i = 0; i < lockedPageCount; i++)
{
VirtualPage lockedPage = lockedPages[i];
if (lockedPage.IsFilled)
{
continue;
}
// The locked page has been created while commit was pending. Let's queue its query data operation.
m_pagingManager.QueueQueryData(lockedPage);
}
}
else
{
// We just completed the last commit operation for a Restart request.
// Send another reset action which will in turn call another restart request.
// This time, no pages should have to be committed and the restart will end correctly, synchronously with the reset.
//this.OnCollectionChanged( new NotifyCollectionChangedEventArgs( NotifyCollectionChangedAction.Reset ) );
this.Restart();
}
}
}
}
