private async void IterateItemSetAndRepeat(IServiceCallback callback)
{
string currentItem = String.Empty;
while (true)
{
//Determine which item is next to be polled
lock (lock_itemSet)
{
//This will get the next element in the set (alphabetical by Name), assuming there is one to get...
ItemInfo nextModel = m_ItemsToTrack.FirstOrDefault(model => String.Compare(model.Name, currentItem) > 0);
//...otherwise, circle back to the first item...
if (nextModel == null)
{
nextModel = m_ItemsToTrack.FirstOrDefault();
}
currentItem = nextModel != null ? nextModel.Name : String.Empty;
}
if (currentItem != String.Empty)
{
ItemInfo updatedModel = null;
//Determine if cache contains "fresh" item info update
// This is where we would query the DB for 'time_of_last_update'
// Was it within the (TBD) time period
//
//if (cacheContainsFreshData)
//{
// models[currentItem] = ... //query db, fill model
//}
//else
try
{
updatedModel = await PollDataSource(currentItem);
}
catch
{
try
{
callback.ClientErrorMessage("This is an error message! >8-P <3 :) meh");
}
catch { }
}
if (updatedModel != null)
{
//Update memento
lock (lock_itemSet)
{
m_ItemsToTrack.RemoveWhere(item => item.Name.Equals(currentItem));
m_ItemsToTrack.Add(updatedModel);
}
//Push updated model to client
XmlSerializer xmlSerializer = new XmlSerializer(updatedModel.GetType());
MemoryStream itemInfoStream = new MemoryStream();
xmlSerializer.Serialize(itemInfoStream, updatedModel);
try
{
callback.ClientUpdate(itemInfoStream);
}
catch (TimeoutException)
{
//shutdown session?
}
}
Thread.Sleep(m_DelayBetweenPollsInMS);
}
else
{
Thread.Sleep(1000);
}
}
}
