/// <summary>
/// Called when a data change event arrives.
/// </summary>
/// <param name="clientHandles">The client handles.</param>
/// <param name="values">The values.</param>
internal void OnDataChange(int[] clientHandles, DaValue[] values)
{
// check if callbacks are enabled.
if (m_monitoredItems == null)
{
return;
}
// lookup client handle a report change directly to monitored item.
lock (m_monitoredItems)
{
for (int ii = 0; ii < clientHandles.Length; ii++)
{
DataChangeInfo info = null;
if (!m_monitoredItems.TryGetValue(clientHandles[ii], out info))
{
continue;
}
MonitoredItem[] monitoredItems = info.MonitoredItems;
// convert the value to a UA value.
info.LastValue = new DataValue();
info.LastError = ReadRequest.GetItemValue(values[ii], info.LastValue, DiagnosticsMasks.All);
info.LastValue.ServerTimestamp = DateTime.UtcNow;
// queue the values.
for (int jj = 0; jj < monitoredItems.Length; jj++)
{
monitoredItems[jj].QueueValue(info.LastValue, info.LastError);
}
}
}
}
/// <summary>
/// Reads the property values and stores the results in the request objects.
/// </summary>
/// <param name="requests">The requests.</param>
public void ReadPropertyValues(List <ReadRequest> requests)
{
for (int ii = 0; ii < requests.Count; ii++)
{
ReadRequest request = requests[ii];
if (request != null && request.PropertyIds != null)
{
request.PropertyValues = ReadPropertyValues(
request.ItemId,
request.PropertyIds.ToArray());
}
}
}
/// <summary>
/// Reads the item values and stores the results in the request object.
/// </summary>
/// <param name="requests">The requests.</param>
public void ReadItemValues(List <ReadRequest> requests)
{
ComDaGroup group = new ComDaGroup(this, false);
try
{
int count1 = 0;
GroupItem[] items = new GroupItem[requests.Count];
ReadRequest[] addItemRequests = new ReadRequest[requests.Count];
// create the items in the temporary group.
for (int ii = 0; ii < requests.Count; ii++)
{
ReadRequest request = requests[ii];
if (request == null)
{
continue;
}
if (!request.ValueRequired)
{
continue;
}
// add the item.
items[count1] = group.CreateItem(request.ItemId, 0, 0, true);
addItemRequests[count1] = request;
count1++;
}
// create the items on the server.
group.ApplyChanges();
// build the list of values to write.
int count2 = 0;
int[] serverHandles = new int[count1];
ReadRequest[] readRequests = new ReadRequest[count1];
for (int ii = 0; ii < count1; ii++)
{
// check for error on create.
GroupItem item = items[ii];
ReadRequest request = addItemRequests[ii];
if (item.ErrorId < 0)
{
request.Value.Error = item.ErrorId;
continue;
}
serverHandles[count2] = item.ServerHandle;
readRequests[count2] = request;
count2++;
}
// write values to the server.
DaValue[] values = group.SyncRead(serverHandles, count2);
// read the values.
for (int ii = 0; ii < count2; ii++)
{
readRequests[ii].Value = values[ii];
}
}
finally
{
// delete the group and items.
group.Delete();
}
}
