async Task LoadMoreNewerAsync()
{
await DetectThreadService.LogAsync();
if (CurrentPageNumber < MaxPageNumber)
{
var realm = Realm.GetInstance();
var currentThread = realm.All <SettingsRealmObject>().First().CurrentNode.CurrentThread;
var lastCommentId = ItemsSource.Last().CommentId;
MaxPageNumber = await currentThread.UpdateAsync(++CurrentPageNumber);
var newItemsSource = currentThread.Comments.OrderByDescending(o => o.CommentDateTime).ToList();
var lastComment = newItemsSource.Where(o => o.CommentId == lastCommentId).First();
var newItemSourceBeginIndex = newItemsSource.IndexOf(lastComment) + 1;
System.Diagnostics.Debug.WriteLine("newItemSourceBeginIndex: " + newItemSourceBeginIndex);
await Device.InvokeOnMainThreadAsync(() =>
{
for (var i = newItemSourceBeginIndex; i < newItemsSource.Count; i++)
{
if (i < newItemsSource.Count)
{
ItemsSource.Add(newItemsSource[i]);
}
}
});
System.Diagnostics.Debug.WriteLine("New Page: " + CurrentPageNumber);
System.Diagnostics.Debug.WriteLine("New ItemsSource.Count: " + ItemsSource.Count);
}
}
void ProcessQueue()
{
Task.Run(async() =>
{
await DetectThreadService.LogAsync();
int index;
// This variable has no meaning
var value = new object();
while (true)
{
await Task.Delay(1000);
if (!RequiredDownloadingCellIndexesQueue.TryPeek(out index))
{
System.Diagnostics.Debug.WriteLine("Skipped because the queue is empty.");
continue;
}
if (Interlocked.Increment(ref DownloadingCount) > MaxDownloadingCount)
{
Interlocked.Decrement(ref DownloadingCount);
System.Diagnostics.Debug.WriteLine("Skipped because over max concurrent updating.");
continue;
}
var _ = Task.Run(async() =>
{
try
{
System.Diagnostics.Debug.WriteLine("Update: " + index);
await ItemsSource[index].UpdateAttachment();
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Exception has occurred: " + index);
System.Diagnostics.Debug.WriteLine("Message: " + e.Message);
System.Diagnostics.Debug.WriteLine("StackTrace: " + e.StackTrace);
if (e.InnerException != null)
{
System.Diagnostics.Debug.WriteLine("InnerException Message: " + e.InnerException.Message);
System.Diagnostics.Debug.WriteLine("InnerException StackTrace: " + e.InnerException.StackTrace);
}
}
finally
{
RequiredDownloadingCellIndexesQueue.TryDequeue(out index);
Interlocked.Decrement(ref DownloadingCount);
RequiredDownloadingCellIndexesDictionary.TryRemove(index, out value);
}
});
}
});
}