/// <summary>
/// Queues a new data change.
/// </summary>
public void QueueValue(DataValue value, ServiceResult error)
{
lock (_lock) {
// check if value has changed.
if (!AlwaysReportUpdates)
{
if (!MonitoredItem.ValueChanged(value, error, _lastValue, _lastError, DataChangeFilter, _range))
{
return;
}
}
// make a shallow copy of the value.
if (value != null)
{
var copy = new DataValue {
WrappedValue = value.WrappedValue,
StatusCode = value.StatusCode,
SourceTimestamp = value.SourceTimestamp,
SourcePicoseconds = value.SourcePicoseconds,
ServerTimestamp = value.ServerTimestamp,
ServerPicoseconds = value.ServerPicoseconds
};
value = copy;
// ensure the data value matches the error status code.
if (error != null && error.StatusCode.Code != 0)
{
value.StatusCode = error.StatusCode;
}
}
_lastValue = value;
_lastError = error;
// queue value.
if (_queue != null)
{
_queue.QueueValue(value, error);
}
// flag the item as ready to publish.
_readyToPublish = true;
_readyToTrigger = true;
}
}