/// <summary>
/// Initializes a new instance of the <see cref="ComHdaBrowserClient"/> class.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="itemId">The qualified area name.</param>
public ComHdaBrowserClient(
ComHdaClient client,
string itemId)
{
m_client = client;
m_itemId = itemId;
}
/// <summary>
/// Initializes the object with the containing subscription object.
/// </summary>
public ComHdaDataCallback(ComHdaClient server)
{
// save group.
m_server = server;
// create connection point.
m_connectionPoint = new ConnectionPoint(server.Unknown, typeof(OpcRcw.Hda.IOPCHDA_DataCallback).GUID);
// advise.
m_connectionPoint.Advise(this);
}
/// <summary>
/// Reads the history of an HDA item annotations.
/// </summary>
private ServiceResult HistoryReadAnnotations(
ServerSystemContext context,
ComHdaClient client,
ReadRawModifiedDetails details,
TimestampsToReturn timestampsToReturn,
HistoryReadValueId nodeToRead,
HdaParsedNodeId parsedNodeId,
HistoryReadResult result)
{
// create the request or load it from a continuation point.
HdaHistoryReadAnnotationRequest request = null;
if (nodeToRead.ContinuationPoint == null)
{
// create a new request.
request = new HdaHistoryReadAnnotationRequest(parsedNodeId.RootId, details, nodeToRead);
// fetch all of the data at once.
result.StatusCode = client.ReadAnnotationHistory(request);
}
else
{
request = LoadContinuationPoint(context, nodeToRead.ContinuationPoint) as HdaHistoryReadAnnotationRequest;
if (request == null)
{
return StatusCodes.BadContinuationPointInvalid;
}
}
// select a subset of the results.
if (StatusCode.IsGood(result.StatusCode))
{
request.Results = new DataValueCollection();
request.GetHistoryResults(context, nodeToRead, request.Results);
}
// fill in the results.
if (request.Results != null)
{
HistoryData data = new HistoryData();
data.DataValues = request.Results;
result.HistoryData = new ExtensionObject(data);
}
// create a new continuation point.
if (!request.Completed)
{
result.ContinuationPoint = SaveContinuationPoint(context, request);
}
return result.StatusCode;
}
/// <summary>
/// Reads the history of an HDA item.
/// </summary>
private ServiceResult HistoryReadItem(
ServerSystemContext context,
ComHdaClient client,
ReadRawModifiedDetails details,
TimestampsToReturn timestampsToReturn,
HistoryReadValueId nodeToRead,
HdaParsedNodeId parsedNodeId,
HistoryReadResult result)
{
// create the request or load it from a continuation point.
HdaHistoryReadRawModifiedRequest request = null;
if (nodeToRead.ContinuationPoint == null)
{
request = new HdaHistoryReadRawModifiedRequest(parsedNodeId.RootId, details, nodeToRead);
}
else
{
request = LoadContinuationPoint(context, nodeToRead.ContinuationPoint) as HdaHistoryReadRawModifiedRequest;
if (request == null)
{
return StatusCodes.BadContinuationPointInvalid;
}
}
// fetch the data.
result.StatusCode = client.ReadHistory(request);
// fill in the results.
if (request.Results != null)
{
HistoryData data = (request.IsReadModified)?new HistoryModifiedData():new HistoryData();
if (request.IsReadModified)
{
((HistoryModifiedData)data).ModificationInfos = request.ModificationInfos;
}
data.DataValues = request.Results;
result.HistoryData = new ExtensionObject(data);
}
// create a new continuation point.
if (!request.Completed)
{
result.ContinuationPoint = SaveContinuationPoint(context, request);
}
return result.StatusCode;
}
/// <summary>
/// Releases the handles.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="requests">The requests.</param>
private void ReleaseHandles(ComHdaClient client, List<HdaSubscribeAttributeRequest> requests)
{
List<int> serverHandles = null;
lock (m_lock)
{
for (int ii = 0; ii < requests.Count; ii++)
{
if (requests[ii].ServerHandle != null)
{
if (serverHandles == null)
{
serverHandles = new List<int>();
}
serverHandles.Add(requests[ii].ServerHandle.Value);
requests[ii].ServerHandle = null;
}
}
}
if (serverHandles == null)
{
return;
}
client.ReleaseItemHandles(serverHandles.ToArray());
}
/// <summary>
/// Assigns the handles to the requests.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="requests">The requests.</param>
private void AssignHandles(ComHdaClient client, Dictionary<string, HdaSubscribeAttributeRequest> requests)
{
List<string> itemIds = null;
lock (m_lock)
{
foreach (KeyValuePair<string,HdaSubscribeAttributeRequest> entry in requests)
{
if (entry.Value.ServerHandle == null)
{
if (itemIds == null)
{
itemIds = new List<string>();
}
itemIds.Add(entry.Key);
}
}
}
if (itemIds == null)
{
return;
}
HdaItem[] items = client.GetItems(itemIds.ToArray());
lock (m_lock)
{
for (int ii = 0; ii < items.Length; ii++)
{
HdaSubscribeAttributeRequest request = null;
if (!requests.TryGetValue(itemIds[ii], out request))
{
continue;
}
if (items[ii].Error < 0)
{
request.ServerHandle = null;
continue;
}
request.ServerHandle = items[ii].ServerHandle;
}
}
}
/// <summary>
/// Finds the children for hda item configuration.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="children">The children.</param>
/// <param name="attributes">The attribute values.</param>
private void FindChildrenForHdaItemConfiguration(ComHdaClient client, List<BaseInstanceState> children, HdaAttributeValue[] attributes)
{
BaseInstanceState child = null;
if (IsRequired(ReferenceTypeIds.HasProperty, false))
{
for (int ii = 0; ii < attributes.Length; ii++)
{
if (attributes[ii].Error < 0 || attributes[ii].Error == ResultIds.S_NODATA)
{
continue;
}
bool skip = true;
switch (attributes[ii].AttributeId)
{
case Constants.OPCHDA_DERIVE_EQUATION:
case Constants.OPCHDA_STEPPED:
case Constants.OPCHDA_MAX_TIME_INT:
case Constants.OPCHDA_MIN_TIME_INT:
case Constants.OPCHDA_EXCEPTION_DEV:
case Constants.OPCHDA_EXCEPTION_DEV_TYPE:
{
skip = false;
break;
}
}
if (skip)
{
continue;
}
child = client.FindItemAttribute(m_itemId, attributes[ii].AttributeId, m_namespaceIndex);
if (child != null)
{
children.Add(child);
}
}
}
}
