/// <summary>
/// Fetch all the attributes and subscribe according to the filter
/// </summary>
public void SubscribeAttributes()
{
//just in case we are resubscribing, clear everything
_d.Invoke(() => FilteredAttributes.Clear());
Attributes.Clear();
DataReferenceSource r = new DataReferenceSource(
Name + "._Attributes[]",
Name,
(i) =>
{
//we need to start this on a new thread otherwise we can't make other calls to the RuntimeDataClient
string[] attributes = (string[])i.VTQ.Value.Array;
if (attributes == null)
{
return;
}
new Thread(() =>
{
Thread.CurrentThread.IsBackground = true;
DealWithNewAttributes(attributes.ToList <string>());
}).Start();
}
);
//just in case
if (DataSubscription != null)
{
DataSubscription.Subscribe(new DataReferenceSource[] { r });
}
}
public void Unsubscribe()
{
try
{
//var result = Items.Select(i => i.DataReference).ToArray();
DataSubscription.UnsubscribeAll();
Items.Clear();
_d.Invoke(() => FilteredAttributes.Clear());
}
catch { }
}
/// <summary>
/// Sort the list of strings and convert it into Attribute objects
/// </summary>
/// <param name="attributes">The value of an objects _Attributes[] attribute</param>
private void DealWithNewAttributes(List <string> attributes)
{
//unsubscribe all previous subscriptions
DataSubscription.UnsubscribeAll();
attributes.Sort();
Dictionary <string, List <string> > uniqueAttributes = new Dictionary <string, List <string> >();
string previous = "zoogabooga";//I bet nobody will call an attribute this
List <string> currentList = new List <string>();
for (int i = 0; i < attributes.Count; i++)
{
if (attributes[i].StartsWith(previous))
{
currentList.Add(attributes[i]);
}
else
{
currentList = new List <string>();
uniqueAttributes.Add(attributes[i], currentList);
previous = attributes[i];
}
}
foreach (var kvp in uniqueAttributes)
{
Attribute a = new Attribute(kvp.Key, kvp.Value, this);
Attributes.Add(a);
a.PropertyChanged += Attribute_PropertyChanged;
}
//Filter the attributes on the GUI dispatcher
_d.Invoke(() =>
{
FilteredAttributes.Clear();
var results = from i in Attributes where (i.Flags & FilterOptions) != 0 select i;
FilteredAttributes.AddRange(results);
});
//subscribe all the filtered Attributes DataItems
foreach (var a in FilteredAttributes)
{
Items.AddRange(a.DataItems);
}
var dataSources = new List <DataReferenceSource>();
foreach (var dataItem in Items)
{
dataSources.Add(
new DataReferenceSource(
dataItem.ReferenceString,
dataItem.OwningObject,
(d) =>
{
dataItem.DataReference = d;
dataItem.DataValue = d.VTQ.Value.RawValue;
dataItem.StatusSetting = d.VTQ.QualityStatus.StatusSetting;
dataItem.MxQuality = d.VTQ.QualityStatus.MxQuality;
dataItem.OpcUaQuality = d.VTQ.QualityStatus.OPCUAQuality;
dataItem.Timestamp = d.VTQ.Timestamp;
}));
}
DataSubscription.Subscribe(dataSources.ToArray());
}
