/// <summary>
/// Initializes a new instance of the <see cref="MonitoredItemAttribute"/> class.
/// </summary>
/// <param name="nodeId">the NodeId to monitor.</param>
/// <param name="attributeId">the attribute to monitor.</param>
/// <param name="indexRange">the range of array indexes to monitor.</param>
/// <param name="samplingInterval">the sampling interval.</param>
/// <param name="queueSize">the length of the queue used by the server to buffer values.</param>
/// <param name="discardOldest">a value indicating whether to discard the oldest entries in the queue when it is full.</param>
/// <param name="dataChangeTrigger">the properties that trigger a data change.</param>
/// <param name="deadbandType">the type of deadband calculation.</param>
/// <param name="deadbandValue">the deadband value.</param>
public MonitoredItemAttribute(string nodeId = null, uint attributeId = AttributeIds.Value, string indexRange = null, int samplingInterval = -1, uint queueSize = 0, bool discardOldest = true, DataChangeTrigger dataChangeTrigger = DataChangeTrigger.StatusValue, DeadbandType deadbandType = DeadbandType.None, double deadbandValue = 0.0)
{
this.NodeId = nodeId;
this.AttributeId = attributeId;
this.IndexRange = indexRange;
this.SamplingInterval = samplingInterval;
this.QueueSize = queueSize;
this.DiscardOldest = discardOldest;
this.DataChangeTrigger = dataChangeTrigger;
this.DeadbandType = deadbandType;
this.DeadbandValue = deadbandValue;
}
/// <summary>
/// Initializes a new instance of the <see cref="MonitoredItemAttribute"/> class.
/// </summary>
/// <param name="nodeId">the NodeId to monitor.</param>
/// <param name="attributeId">the attribute to monitor.</param>
/// <param name="indexRange">the range of array indexes to monitor.</param>
/// <param name="samplingInterval">the sampling interval.</param>
/// <param name="queueSize">the length of the queue used by the server to buffer values.</param>
/// <param name="discardOldest">a value indicating whether to discard the oldest entries in the queue when it is full.</param>
/// <param name="dataChangeTrigger">the properties that trigger a data change.</param>
/// <param name="deadbandType">the type of deadband calculation.</param>
/// <param name="deadbandValue">the deadband value.</param>
public MonitoredItemAttribute(string nodeId, uint attributeId = AttributeIds.Value, string?indexRange = null, int samplingInterval = -1, uint queueSize = 0, bool discardOldest = true, DataChangeTrigger dataChangeTrigger = DataChangeTrigger.StatusValue, DeadbandType deadbandType = DeadbandType.None, double deadbandValue = 0.0)
{
NodeId = nodeId;
AttributeId = attributeId;
IndexRange = indexRange;
SamplingInterval = samplingInterval;
QueueSize = queueSize;
DiscardOldest = discardOldest;
DataChangeTrigger = dataChangeTrigger;
DeadbandType = deadbandType;
DeadbandValue = deadbandValue;
}
private void DeadbandTypeCB_SelectedIndexChanged(object sender, EventArgs e)
{
DeadbandType deadbandType = (DeadbandType)DeadbandTypeCB.SelectedItem;
DeadbandNC.Enabled = deadbandType != DeadbandType.None;
if (deadbandType == DeadbandType.Percent)
{
DeadbandNC.Minimum = 0;
DeadbandNC.Maximum = 100;
}
else
{
DeadbandNC.Minimum = Decimal.MinValue;
DeadbandNC.Maximum = Decimal.MaxValue;
}
}
/// <summary>
/// Returns true if the deadband was exceeded.
/// </summary>
private static bool ExceedsDeadband(double value1, double value2, DeadbandType deadbandType, double deadband, double range)
{
double baseline = 1;
if (deadbandType == DeadbandType.Percent)
{
baseline = range / 100;
}
if (baseline > 0)
{
if (Math.Abs((value1 - value2)/baseline) <= (double)deadband)
{
return false;
}
}
return true;
}
/// <summary>
/// Returns true if the deadband was exceeded.
/// </summary>
protected static bool ExceedsDeadband(object value1, object value2, DeadbandType deadbandType, double deadband, double range)
{
// cannot convert doubles safely to decimals.
if (value1 is double)
{
return ExceedsDeadband((double)value1, (double)value2, deadbandType, deadband, range);
}
try
{
decimal decimal1 = Convert.ToDecimal(value1, CultureInfo.InvariantCulture);
decimal decimal2 = Convert.ToDecimal(value2, CultureInfo.InvariantCulture);
decimal baseline = 1;
if (deadbandType == DeadbandType.Percent)
{
baseline = ((decimal)range) / 100;
}
if (baseline > 0)
{
if (Math.Abs((decimal1 - decimal2)/baseline) <= (decimal)deadband)
{
return false;
}
}
}
catch
{
// treat all conversion errors as evidence that the deadband was exceeded.
}
return true;
}
/// <summary>
/// Checks if the two values are equal.
/// </summary>
protected static bool Equals(object value1, object value2, DeadbandType deadbandType, double deadband, double range)
{
// check if reference to same object.
if (Object.ReferenceEquals(value1, value2))
{
return true;
}
// check for invalid values.
if (value1 == null || value2 == null)
{
return value1 == value2;
}
// check for type change.
if (value1.GetType() != value2.GetType())
{
return false;
}
// check if values are equal.
if (value1.Equals(value2))
{
return true;
}
// check for arrays.
Array array1 = value1 as Array;
Array array2 = value2 as Array;
if (array1 == null || array2 == null)
{
XmlElement xmlElement1 = value1 as XmlElement;
XmlElement xmlElement2 = value2 as XmlElement;
if (xmlElement1 != null && xmlElement2 != null)
{
return xmlElement1.OuterXml.Equals(xmlElement2.OuterXml);
}
// nothing more to do if no deadband.
if (deadbandType == DeadbandType.None)
{
return false;
}
// check deadband.
return !ExceedsDeadband(value1, value2, deadbandType, deadband, range);
}
// compare lengths.
if (array1.Length != array2.Length)
{
return false;
}
// compare each element.
bool isVariant = array1.GetType().GetElementType() == typeof(Variant);
for (int ii = 0; ii < array1.Length; ii++)
{
object element1 = array1.GetValue(ii);
object element2 = array2.GetValue(ii);
if (isVariant)
{
element1 = ((Variant)element1).Value;
element2 = ((Variant)element2).Value;
}
if (!Equals(element1, element2, deadbandType, deadband, range))
{
return false;
}
}
// must be equal.
return true;
}
/// <summary>
/// Prompts the user to edit the monitored item.
/// </summary>
public bool ShowDialog(Session session, MonitoredItem monitoredItem, bool isEvent)
{
if (!monitoredItem.Created)
{
NodeBTN.Session = session;
NodeBTN.SelectedNode = monitoredItem.StartNodeId;
}
// hide fields not used for events.
NodeLB.Visible = !monitoredItem.Created;
NodeTB.Visible = !monitoredItem.Created;
NodeBTN.Visible = !monitoredItem.Created;
AttributeLB.Visible = !isEvent && !monitoredItem.Created;
AttributeCB.Visible = !isEvent && !monitoredItem.Created;
IndexRangeLB.Visible = !isEvent && !monitoredItem.Created;
IndexRangeTB.Visible = !isEvent && !monitoredItem.Created;
DataEncodingLB.Visible = !isEvent && !monitoredItem.Created;
DataEncodingCB.Visible = !isEvent && !monitoredItem.Created;
MonitoringModeLB.Visible = !monitoredItem.Created;
MonitoringModeCB.Visible = !monitoredItem.Created;
SamplingIntervalLB.Visible = true;
SamplingIntervalUP.Visible = true;
QueueSizeLB.Visible = !isEvent;
QueueSizeUP.Visible = !isEvent;
DiscardOldestLB.Visible = true;
DiscardOldestCK.Visible = true;
DeadbandTypeLB.Visible = !isEvent;
DeadbandTypeCB.Visible = !isEvent;
DeadbandValueLB.Visible = !isEvent;
DeadbandValueUP.Visible = !isEvent;
TriggerTypeLB.Visible = !isEvent;
TriggerTypeCB.Visible = !isEvent;
// fill in values.
SamplingIntervalUP.Value = monitoredItem.SamplingInterval;
DiscardOldestCK.Checked = monitoredItem.DiscardOldest;
if (!isEvent)
{
AttributeCB.SelectedIndex = (int)(monitoredItem.AttributeId - 1);
IndexRangeTB.Text = monitoredItem.IndexRange;
MonitoringModeCB.SelectedItem = monitoredItem.MonitoringMode;
QueueSizeUP.Value = monitoredItem.QueueSize;
DataChangeFilter filter = monitoredItem.Filter as DataChangeFilter;
if (filter != null)
{
DeadbandTypeCB.SelectedItem = (DeadbandType)filter.DeadbandType;
DeadbandValueUP.Value = (decimal)filter.DeadbandValue;
TriggerTypeCB.SelectedItem = filter.Trigger;
}
if (!monitoredItem.Created)
{
// fetch the available encodings for the first node in the list from the server.
IVariableBase variable = session.NodeCache.Find(monitoredItem.StartNodeId) as IVariableBase;
DataEncodingCB.Items.Add(new EncodingInfo());
DataEncodingCB.SelectedIndex = 0;
if (variable != null)
{
if (session.NodeCache.IsTypeOf(variable.DataType, Opc.Ua.DataTypeIds.Structure))
{
foreach (INode encoding in session.NodeCache.Find(variable.DataType, Opc.Ua.ReferenceTypeIds.HasEncoding, false, true))
{
DataEncodingCB.Items.Add(new EncodingInfo()
{
EncodingName = encoding.BrowseName
});
if (monitoredItem.Encoding == encoding.BrowseName)
{
DataEncodingCB.SelectedIndex = DataEncodingCB.Items.Count - 1;
}
}
}
}
}
}
else
{
AttributeCB.SelectedIndex = ((int)Attributes.EventNotifier - 1);
}
if (base.ShowDialog() != DialogResult.OK)
{
return(false);
}
// update monitored item.
if (!monitoredItem.Created)
{
monitoredItem.StartNodeId = NodeBTN.SelectedNode;
monitoredItem.DisplayName = session.NodeCache.GetDisplayText(monitoredItem.StartNodeId);
monitoredItem.RelativePath = null;
monitoredItem.AttributeId = (uint)(AttributeCB.SelectedIndex + 1);
monitoredItem.MonitoringMode = (MonitoringMode)MonitoringModeCB.SelectedItem;
}
monitoredItem.SamplingInterval = (int)SamplingIntervalUP.Value;
monitoredItem.DiscardOldest = DiscardOldestCK.Checked;
if (!isEvent)
{
if (!monitoredItem.Created)
{
monitoredItem.IndexRange = IndexRangeTB.Text.Trim();
monitoredItem.Encoding = ((EncodingInfo)DataEncodingCB.SelectedItem).EncodingName;
}
monitoredItem.QueueSize = (uint)QueueSizeUP.Value;
DataChangeTrigger trigger = (DataChangeTrigger)TriggerTypeCB.SelectedItem;
DeadbandType deadbandType = (DeadbandType)DeadbandTypeCB.SelectedItem;
if (monitoredItem.Filter != null || deadbandType != DeadbandType.None || trigger != DataChangeTrigger.StatusValue)
{
DataChangeFilter filter = new DataChangeFilter();
filter.DeadbandType = (uint)deadbandType;
filter.DeadbandValue = (double)DeadbandValueUP.Value;
filter.Trigger = trigger;
monitoredItem.Filter = filter;
}
}
else
{
if (!monitoredItem.Created)
{
monitoredItem.IndexRange = null;
monitoredItem.Encoding = null;
}
monitoredItem.QueueSize = 0;
monitoredItem.Filter = new EventFilter();
}
return(true);
}