/// <summary>
/// Returns a snapshot of the tags belonging to the block.
/// </summary>
/// <returns>The list of tags. Null if the block does not exist.</returns>
public IList <UnderlyingSystemTag> GetTags()
{
lock (_tags) {
// create snapshots of the tags.
var tags = new UnderlyingSystemTag[_tags.Count];
for (var ii = 0; ii < _tags.Count; ii++)
{
tags[ii] = _tags[ii].CreateSnapshot();
}
return(tags);
}
}
/// <summary>
/// Updates the metadata for a tag.
/// </summary>
private bool UpdateTagMetadata(
UnderlyingSystemTag tag,
Opc.Ua.Test.DataGenerator generator)
{
switch (tag.TagType)
{
case UnderlyingSystemTagType.Analog: {
if (tag.EuRange != null)
{
var range = new double[tag.EuRange.Length];
for (var ii = 0; ii < tag.EuRange.Length; ii++)
{
range[ii] = tag.EuRange[ii] + 1;
}
tag.EuRange = range;
}
break;
}
case UnderlyingSystemTagType.Digital:
case UnderlyingSystemTagType.Enumerated: {
if (tag.Labels != null)
{
var labels = new string[tag.Labels.Length];
for (var ii = 0; ii < tag.Labels.Length; ii++)
{
labels[ii] = generator.GetRandomString();
}
tag.Labels = labels;
}
break;
}
default: {
return(false);
}
}
return(true);
}
/// <summary>
/// Creates the tag.
/// </summary>
/// <param name="tagName">Name of the tag.</param>
/// <param name="dataType">Type of the data.</param>
/// <param name="tagType">Type of the tag.</param>
/// <param name="engineeringUnits">The engineering units.</param>
/// <param name="writeable">if set to <c>true</c> the tag is writeable.</param>
public void CreateTag(
string tagName,
UnderlyingSystemDataType dataType,
UnderlyingSystemTagType tagType,
string engineeringUnits,
bool writeable)
{
// create tag.
var tag = new UnderlyingSystemTag {
Block = this,
Name = tagName,
Description = null,
EngineeringUnits = engineeringUnits,
DataType = dataType,
TagType = tagType,
IsWriteable = writeable,
Labels = null,
EuRange = null
};
switch (tagType)
{
case UnderlyingSystemTagType.Analog: {
tag.Description = "An analog value.";
tag.TagType = UnderlyingSystemTagType.Analog;
tag.EuRange = new double[] { 100, 0 };
break;
}
case UnderlyingSystemTagType.Digital: {
tag.Description = "A digital value.";
tag.TagType = UnderlyingSystemTagType.Digital;
tag.Labels = new string[] { "Online", "Offline" };
break;
}
case UnderlyingSystemTagType.Enumerated: {
tag.Description = "An enumerated value.";
tag.TagType = UnderlyingSystemTagType.Enumerated;
tag.Labels = new string[] { "Red", "Yellow", "Green" };
break;
}
default: {
tag.Description = "A generic value.";
break;
}
}
// set an initial value.
switch (tag.DataType)
{
case UnderlyingSystemDataType.Integer1: { tag.Value = (sbyte)0; break; }
case UnderlyingSystemDataType.Integer2: { tag.Value = (short)0; break; }
case UnderlyingSystemDataType.Integer4: { tag.Value = 0; break; }
case UnderlyingSystemDataType.Real4: { tag.Value = (float)0; break; }
case UnderlyingSystemDataType.String: { tag.Value = string.Empty; break; }
}
lock (_tags) {
_tags.Add(tag);
Timestamp = DateTime.UtcNow;
}
}
/// <summary>
/// Updates the value of an tag.
/// </summary>
private bool UpdateTagValue(
UnderlyingSystemTag tag,
Opc.Ua.Test.DataGenerator generator)
{
// don't update writeable tags.
if (tag.IsWriteable)
{
return(false);
}
// check if a range applies to the value.
var high = 0;
var low = 0;
switch (tag.TagType)
{
case UnderlyingSystemTagType.Analog: {
if (tag.EuRange != null && tag.EuRange.Length >= 2)
{
high = (int)tag.EuRange[0];
low = (int)tag.EuRange[1];
}
break;
}
case UnderlyingSystemTagType.Digital: {
high = 1;
low = 0;
break;
}
case UnderlyingSystemTagType.Enumerated: {
if (tag.Labels != null && tag.Labels.Length > 0)
{
high = tag.Labels.Length - 1;
low = 0;
}
break;
}
}
// select a value in the range.
var value = -1;
if (high > low)
{
value = (generator.GetRandomUInt16() % (high - low + 1)) + low;
}
// cast value to correct type or generate a random value.
switch (tag.DataType)
{
case UnderlyingSystemDataType.Integer1: {
if (value == -1)
{
tag.Value = generator.GetRandomSByte();
}
else
{
tag.Value = (sbyte)value;
}
break;
}
case UnderlyingSystemDataType.Integer2: {
if (value == -1)
{
tag.Value = generator.GetRandomInt16();
}
else
{
tag.Value = (short)value;
}
break;
}
case UnderlyingSystemDataType.Integer4: {
if (value == -1)
{
tag.Value = generator.GetRandomInt32();
}
else
{
tag.Value = value;
}
break;
}
case UnderlyingSystemDataType.Real4: {
if (value == -1)
{
tag.Value = generator.GetRandomFloat();
}
else
{
tag.Value = (float)value;
}
break;
}
case UnderlyingSystemDataType.String: {
tag.Value = generator.GetRandomString();
break;
}
}
tag.Timestamp = DateTime.UtcNow;
return(true);
}
/// <summary>
/// Writes the tag value.
/// </summary>
/// <param name="tagName">Name of the tag.</param>
/// <param name="value">The value.</param>
/// <returns>The status code for the operation.</returns>
public uint WriteTagValue(string tagName, object value)
{
UnderlyingSystemTag tag = null;
TagsChangedEventHandler onTagsChanged = null;
lock (_tags) {
onTagsChanged = OnTagsChanged;
// find the tag.
tag = FindTag(tagName);
if (tag == null)
{
return(StatusCodes.BadNodeIdUnknown);
}
// cast value to correct type.
try {
switch (tag.DataType)
{
case UnderlyingSystemDataType.Integer1: {
tag.Value = (sbyte)value;
break;
}
case UnderlyingSystemDataType.Integer2: {
tag.Value = (short)value;
break;
}
case UnderlyingSystemDataType.Integer4: {
tag.Value = (int)value;
break;
}
case UnderlyingSystemDataType.Real4: {
tag.Value = (float)value;
break;
}
case UnderlyingSystemDataType.String: {
tag.Value = (string)value;
break;
}
}
}
catch {
return(StatusCodes.BadTypeMismatch);
}
// updated the timestamp.
tag.Timestamp = DateTime.UtcNow;
}
// raise notification.
if (tag != null && onTagsChanged != null)
{
onTagsChanged(new UnderlyingSystemTag[] { tag });
}
return(StatusCodes.Good);
}