/// <summary>
/// Reads to identifier to show for notification in payload of IoT Hub method
/// Prio 1: DataSetFieldId (need to be read from message)
/// Prio 2: DisplayName - nothing to do, because notification.Id already contains DisplayName
/// Prio 3: ExpandedNodeId
/// </summary>
/// <param name="notification">Notification, were ID need to be looked up for</param>
/// <param name="message">subscription notification message, containing notifications</param>
/// <param name="context">service context</param>
/// <returns>identifier of payload element</returns>
private string GetPayloadIdentifier(MonitoredItemNotificationModel notification, DataSetMessageModel message, ServiceMessageContext context)
{
if (notification is null)
{
throw new ArgumentNullException(nameof(notification));
}
if (message is null)
{
throw new ArgumentNullException(nameof(message));
}
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
var notificationNodeId = notification.NodeId.ToString();
var notificationExpandedNodeId = notification.NodeId.ToExpandedNodeId(context.NamespaceUris).AsString(context);
if (_knownPayloadIdentifiers.TryGetValue(notificationNodeId, out var knownPayloadIdentifier) && !string.IsNullOrEmpty(knownPayloadIdentifier))
{
return(knownPayloadIdentifier);
}
else
{
//do the long running lookup as less as possible
var dataSetWriter = message.Writer;
foreach (var publishedVariableData in dataSetWriter.DataSet.DataSetSource.PublishedVariables.PublishedData)
{
if (publishedVariableData.PublishedVariableNodeId == notification.NodeId ||
publishedVariableData.PublishedVariableNodeId.ToExpandedNodeId(context).AsString(context) == notificationExpandedNodeId)
{
if (publishedVariableData.Id != notification.NodeId)
{
_knownPayloadIdentifiers[notificationNodeId] = publishedVariableData.Id;
return(publishedVariableData.Id);
}
else
{
var notificationIdentifier = !string.IsNullOrEmpty(notification.Id)
? notification.Id
: notificationExpandedNodeId;
_knownPayloadIdentifiers[notificationNodeId] = notificationIdentifier;
return(notificationIdentifier);
}
}
}
}
// Fall back to id of the notification or expanded node id.
var knownIdentifier = !string.IsNullOrEmpty(notification.Id)
? notification.Id
: notificationExpandedNodeId;
_knownPayloadIdentifiers[notification.NodeId.ToString()] = knownIdentifier;
return(knownIdentifier);
}
/// <summary>
/// Reads to identifier to show for notification in payload of IoT Hub method
/// Prio 1: DataSetFieldId (need to be read from message)
/// Prio 2: DisplayName - nothing to do, because notification.Id already contains DisplayName
/// Prio 3: ExpandedNodeId
/// </summary>
/// <param name="notification">Notification, were ID need to be looked up for</param>
/// <param name="message">subscription notification message, containing notifications</param>
/// <param name="context">service context</param>
/// <returns>identifier of payload element</returns>
private string GetPayloadIdentifier(MonitoredItemNotificationModel notification, DataSetMessageModel message, ServiceMessageContext context)
{
if (notification is null)
{
throw new ArgumentNullException(nameof(notification));
}
if (message is null)
{
throw new ArgumentNullException(nameof(message));
}
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (_knownPayloadIdentifiers.TryGetValue(notification.NodeId.ToString(), out var knownPayloadIdentifier))
{
if (!string.IsNullOrEmpty(knownPayloadIdentifier))
{
return(knownPayloadIdentifier);
}
}
else //do the long running lookup as less as possible
{
foreach (var dataSetWriter in message.WriterGroup.DataSetWriters)
{
foreach (var publishedVariableData in dataSetWriter.DataSet.DataSetSource.PublishedVariables.PublishedData)
{
if ((publishedVariableData.PublishedVariableNodeId == notification.NodeId ||
publishedVariableData.PublishedVariableNodeId.ToExpandedNodeId(context).AsString(context) == notification.NodeId.ToExpandedNodeId(context.NamespaceUris).AsString(context)) &&
publishedVariableData.Id != notification.NodeId)
{
_knownPayloadIdentifiers[notification.NodeId.ToString()] = publishedVariableData.Id;
return(publishedVariableData.Id);
}
else
{
_knownPayloadIdentifiers[notification.NodeId.ToString()] = string.Empty;
}
}
}
}
return(!string.IsNullOrEmpty(notification.Id)
? notification.Id
: notification.NodeId.ToExpandedNodeId(context.NamespaceUris)
.AsString(message.ServiceMessageContext));
}
