public static void AddOrUpdateEventGroup(string opcServerUrl, OpcEventGroup eventGroup)
{
lock (GetLockObject(opcServerUrl))
{
OpcDaServer server = GetServer(opcServerUrl);
if (server == null)
{
return;
}
if (eventGroup?.Paths == null || eventGroup.Paths.Length == 0)
{
RemoveEventGroup(opcServerUrl, eventGroup.EventId);
return;
}
// If server isn't connected or there is no ping thread running, then we aren't listening, and can't do anything here:
PingThread pingThread;
if (!ServerIsConnected(opcServerUrl) || !pingThreads.TryGetValue(opcServerUrl, out pingThread) || !pingThread.IsRunning)
{
return;
}
string groupName = "DecisionsGroup_" + eventGroup.EventId;
OpcDaGroup group = server.Groups.FirstOrDefault(x => x.Name == groupName);
if (group == null)
{
group = server.AddGroup(groupName);
group.IsActive = true;
AddItemIdsToGroup(group, eventGroup.Paths);
OpcDaItemValue[] values = group.Read(group.Items, OpcDaDataSource.Device);
Callback(opcServerUrl, eventGroup.EventId, ConvertToBaseTagValues(values)); // Send all current values in this group before subscribing to further changes
group.ValuesChanged += (object sender, OpcDaItemValuesChangedEventArgs e) =>
{
Callback(opcServerUrl, eventGroup.EventId, ConvertToBaseTagValues(e.Values));
};
}
else
{
string[] addedPaths = eventGroup.Paths.Except(group.Items.Select(x => x.ItemId)).ToArray();
OpcDaItem[] removedItems = group.Items.Where(x => !eventGroup.Paths.Contains(x.ItemId)).ToArray();
AddItemIdsToGroup(group, addedPaths);
if (removedItems.Length > 0)
{
group.RemoveItems(removedItems); // could check return value for errors here
}
}
group.PercentDeadband = eventGroup.Deadband;
group.UpdateRate = TimeSpan.FromMilliseconds(eventGroup.UpdateRate > 0 ? eventGroup.UpdateRate : 100); // ValuesChanged won't be triggered if zero
}
}
