/// <summary>
/// Reads the value for the specified attribute.
/// </summary>
public override void Read(
OperationContext context,
double maxAge,
IList<ReadValueId> nodesToRead,
IList<DataValue> values,
IList<ServiceResult> errors)
{
ServerSystemContext systemContext = SystemContext.Copy(context);
IDictionary<NodeId, NodeState> operationCache = new NodeIdDictionary<NodeState>();
List<DataSourceClient.ReadRequest> readRequests = new List<DataSourceClient.ReadRequest>();
lock (Lock)
{
for (int ii = 0; ii < nodesToRead.Count; ii++)
{
ReadValueId nodeToRead = nodesToRead[ii];
// skip items that have already been processed.
if (nodeToRead.Processed)
{
continue;
}
// check for valid handle.
NodeHandle handle = GetManagerHandle(systemContext, nodeToRead.NodeId, operationCache);
if (handle == null)
{
continue;
}
// owned by this node manager.
nodeToRead.Processed = true;
// create an initial value.
DataValue value = values[ii] = new DataValue();
value.Value = null;
value.ServerTimestamp = DateTime.UtcNow;
value.SourceTimestamp = DateTime.MinValue;
value.StatusCode = StatusCodes.Good;
// check if the node is a area in memory.
if (handle.Node == null)
{
errors[ii] = StatusCodes.BadNodeIdUnknown;
continue;
}
if (nodeToRead.AttributeId == Attributes.Value)
{
// check if the request if for a remote node.
RemoteNode remoteNode = null;
if (m_remoteNodes.TryGetValue(handle.NodeId, out remoteNode))
{
DataSourceClient.ReadRequest request = new DataSourceClient.ReadRequest();
request.RemoteId = remoteNode.RemoteId;
request.ReadValueId = nodeToRead;
request.Value = value;
request.Index = ii;
readRequests.Add(request);
errors[ii] = StatusCodes.BadNoCommunication;
continue;
}
}
// read the attribute value.
errors[ii] = handle.Node.ReadAttribute(
systemContext,
nodeToRead.AttributeId,
nodeToRead.ParsedIndexRange,
nodeToRead.DataEncoding,
value);
}
// check for nothing to do.
if (readRequests.Count == 0)
{
return;
}
}
// read from the remote data source.
List<ServiceResult> results = m_source.Read(readRequests);
for (int ii = 0; ii < readRequests.Count; ii++)
{
values[readRequests[ii].Index] = readRequests[ii].Value;
errors[readRequests[ii].Index] = results[ii];
}
}
/// <summary>
/// Reads the value for the specified attribute.
/// </summary>
public override void Read(
OperationContext context,
double maxAge,
IList <ReadValueId> nodesToRead,
IList <DataValue> values,
IList <ServiceResult> errors)
{
ServerSystemContext systemContext = SystemContext.Copy(context);
IDictionary <NodeId, NodeState> operationCache = new NodeIdDictionary <NodeState>();
List <DataSourceClient.ReadRequest> readRequests = new List <DataSourceClient.ReadRequest>();
lock (Lock)
{
for (int ii = 0; ii < nodesToRead.Count; ii++)
{
ReadValueId nodeToRead = nodesToRead[ii];
// skip items that have already been processed.
if (nodeToRead.Processed)
{
continue;
}
// check for valid handle.
NodeHandle handle = GetManagerHandle(systemContext, nodeToRead.NodeId, operationCache);
if (handle == null)
{
continue;
}
// owned by this node manager.
nodeToRead.Processed = true;
// create an initial value.
DataValue value = values[ii] = new DataValue();
value.Value = null;
value.ServerTimestamp = DateTime.UtcNow;
value.SourceTimestamp = DateTime.MinValue;
value.StatusCode = StatusCodes.Good;
// check if the node is a area in memory.
if (handle.Node == null)
{
errors[ii] = StatusCodes.BadNodeIdUnknown;
continue;
}
if (nodeToRead.AttributeId == Attributes.Value)
{
// check if the request if for a remote node.
RemoteNode remoteNode = null;
if (m_remoteNodes.TryGetValue(handle.NodeId, out remoteNode))
{
DataSourceClient.ReadRequest request = new DataSourceClient.ReadRequest();
request.RemoteId = remoteNode.RemoteId;
request.ReadValueId = nodeToRead;
request.Value = value;
request.Index = ii;
readRequests.Add(request);
errors[ii] = StatusCodes.BadNoCommunication;
continue;
}
}
// read the attribute value.
errors[ii] = handle.Node.ReadAttribute(
systemContext,
nodeToRead.AttributeId,
nodeToRead.ParsedIndexRange,
nodeToRead.DataEncoding,
value);
}
// check for nothing to do.
if (readRequests.Count == 0)
{
return;
}
}
// read from the remote data source.
List <ServiceResult> results = m_source.Read(readRequests);
for (int ii = 0; ii < readRequests.Count; ii++)
{
values[readRequests[ii].Index] = readRequests[ii].Value;
errors[readRequests[ii].Index] = results[ii];
}
}
