private void CleanupContinuationPoints()
{
ArrayList list = new ArrayList();
foreach (DictionaryEntry entry in this.m_continuationPoints)
{
try
{
ContinuationPoint point = entry.Value as ContinuationPoint;
if ((DateTime.UtcNow.Ticks - point.Timestamp.Ticks) > 0x165a0bc00L)
{
list.Add(entry.Key);
}
}
catch
{
list.Add(entry.Key);
}
}
foreach (string str in list)
{
ContinuationPoint point2 = (ContinuationPoint)this.m_continuationPoints[str];
this.m_continuationPoints.Remove(str);
point2.Position.Dispose();
}
}
/// <summary>
/// Checks if the node is in the view.
/// </summary>
protected override bool IsNodeInView(ServerSystemContext context, ContinuationPoint continuationPoint, NodeState node)
{
if (continuationPoint.View != null)
{
if (continuationPoint.View.ViewId == new NodeId(Quickstarts.Views.Views.Engineering, NamespaceIndex))
{
// suppress operations properties.
if (node != null && node.BrowseName.NamespaceIndex == NamespaceIndexes[2])
{
return(false);
}
}
if (continuationPoint.View.ViewId == new NodeId(Quickstarts.Views.Views.Operations, NamespaceIndex))
{
// suppress engineering properties.
if (node != null && node.BrowseName.NamespaceIndex == NamespaceIndexes[1])
{
return(false);
}
}
}
return(true);
}
/// <summary>
/// Checks if the reference is in the view.
/// </summary>
protected override bool IsReferenceInView(ServerSystemContext context, ContinuationPoint continuationPoint, IReference reference)
{
if (continuationPoint.View != null)
{
// guard against absolute node ids.
if (reference.TargetId.IsAbsolute)
{
return(true);
}
// find the node.
NodeState node = FindPredefinedNode((NodeId)reference.TargetId, typeof(NodeState));
if (node != null)
{
return(IsNodeInView(context, continuationPoint, node));
}
}
return(true);
}
/// <summary>
/// Browses for the children of the specified item.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="itemId">The item id.</param>
/// <param name="continuationPoint">The continuation point.</param>
/// <param name="maxElementsReturned">The max elements returned.</param>
/// <param name="elementFilter">The element filter.</param>
/// <param name="nameFilter">The name filter.</param>
/// <param name="revisedContinuationPoint">The revised continuation point.</param>
/// <returns>The list of elements that meet the criteria.</returns>
public List <ComDaBrowseElement> BrowseForElements(
Session session,
string itemId,
string continuationPoint,
int maxElementsReturned,
int elementFilter,
string nameFilter,
out string revisedContinuationPoint)
{
TraceState("BrowseForElements", itemId, continuationPoint, maxElementsReturned, elementFilter, nameFilter);
revisedContinuationPoint = String.Empty;
// look up continuation point.
ContinuationPoint cp = null;
if (!String.IsNullOrEmpty(continuationPoint))
{
if (!m_continuationPoints.TryGetValue(continuationPoint, out cp))
{
throw ComUtils.CreateComException(ResultIds.E_INVALIDCONTINUATIONPOINT);
}
m_continuationPoints.Remove(continuationPoint);
}
// get the element queue.
Queue <ComDaBrowseElement> elements = null;
// get element from continuation point.
if (cp != null)
{
elements = cp.Elements;
}
// get list from cache.
else
{
elements = m_cache.BrowseForElements(session, itemId);
// check if nothing found.
if (elements == null)
{
throw ComUtils.CreateComException(ResultIds.E_UNKNOWNITEMID);
}
}
// apply filters.
List <ComDaBrowseElement> hits = new List <ComDaBrowseElement>();
while (elements.Count > 0)
{
ComDaBrowseElement hit = elements.Dequeue();
// apply name filter.
if (!String.IsNullOrEmpty(nameFilter))
{
if (!ComUtils.Match(hit.BrowseName, nameFilter, true))
{
continue;
}
}
// apply element filter
if (elementFilter == (int)OpcRcw.Da.OPCBROWSEFILTER.OPC_BROWSE_FILTER_BRANCHES)
{
if (!hit.HasChildren)
{
continue;
}
}
if (elementFilter == (int)OpcRcw.Da.OPCBROWSEFILTER.OPC_BROWSE_FILTER_ITEMS)
{
if (!hit.IsItem)
{
continue;
}
}
// check max reached.
if (maxElementsReturned > 0 && hits.Count == maxElementsReturned)
{
elements.Enqueue(hit);
cp = new ContinuationPoint();
cp.Id = Guid.NewGuid().ToString();
cp.Elements = elements;
m_continuationPoints.Add(cp.Id, cp);
revisedContinuationPoint = cp.Id;
break;
}
// add the result.
hits.Add(hit);
}
// return results.
return(hits);
}
/// <summary>
/// Browses for the children of the specified item.
/// </summary>
/// <param name="session">The session.</param>
/// <param name="itemId">The item id.</param>
/// <param name="continuationPoint">The continuation point.</param>
/// <param name="maxElementsReturned">The max elements returned.</param>
/// <param name="elementFilter">The element filter.</param>
/// <param name="nameFilter">The name filter.</param>
/// <param name="revisedContinuationPoint">The revised continuation point.</param>
/// <returns>The list of elements that meet the criteria.</returns>
public List<ComDaBrowseElement> BrowseForElements(
Session session,
string itemId,
string continuationPoint,
int maxElementsReturned,
int elementFilter,
string nameFilter,
out string revisedContinuationPoint)
{
TraceState("BrowseForElements", itemId, continuationPoint, maxElementsReturned, elementFilter, nameFilter);
revisedContinuationPoint = String.Empty;
// look up continuation point.
ContinuationPoint cp = null;
if (!String.IsNullOrEmpty(continuationPoint))
{
if (!m_continuationPoints.TryGetValue(continuationPoint, out cp))
{
throw ComUtils.CreateComException(ResultIds.E_INVALIDCONTINUATIONPOINT);
}
m_continuationPoints.Remove(continuationPoint);
}
// get the element queue.
Queue<ComDaBrowseElement> elements = null;
// get element from continuation point.
if (cp != null)
{
elements = cp.Elements;
}
// get list from cache.
else
{
elements = m_cache.BrowseForElements(session, itemId);
// check if nothing found.
if (elements == null)
{
throw ComUtils.CreateComException(ResultIds.E_UNKNOWNITEMID);
}
}
// apply filters.
List<ComDaBrowseElement> hits = new List<ComDaBrowseElement>();
while (elements.Count > 0)
{
ComDaBrowseElement hit = elements.Dequeue();
// apply name filter.
if (!String.IsNullOrEmpty(nameFilter))
{
if (!ComUtils.Match(hit.BrowseName, nameFilter, true))
{
continue;
}
}
// apply element filter
if (elementFilter == (int)OpcRcw.Da.OPCBROWSEFILTER.OPC_BROWSE_FILTER_BRANCHES)
{
if (!hit.HasChildren)
{
continue;
}
}
if (elementFilter == (int)OpcRcw.Da.OPCBROWSEFILTER.OPC_BROWSE_FILTER_ITEMS)
{
if (!hit.IsItem)
{
continue;
}
}
// check max reached.
if (maxElementsReturned > 0 && hits.Count == maxElementsReturned)
{
elements.Enqueue(hit);
cp = new ContinuationPoint();
cp.Id = Guid.NewGuid().ToString();
cp.Elements = elements;
m_continuationPoints.Add(cp.Id, cp);
revisedContinuationPoint = cp.Id;
break;
}
// add the result.
hits.Add(hit);
}
// return results.
return hits;
}
public void Browse(string szItemID, ref IntPtr pszContinuationPoint, int dwMaxElementsReturned, OPCBROWSEFILTER dwBrowseFilter, string szElementNameFilter, string szVendorFilter, int bReturnAllProperties, int bReturnPropertyValues, int dwPropertyCount, int[] pdwPropertyIDs, out int pbMoreElements, out int pdwCount, out IntPtr ppBrowseElements)
{
OpcCom.Da.Wrapper.Server server;
Monitor.Enter(server = this);
try
{
ItemIdentifier itemID = new ItemIdentifier(szItemID);
BrowseFilters filters = new BrowseFilters {
MaxElementsReturned = dwMaxElementsReturned,
BrowseFilter = OpcCom.Da.Interop.GetBrowseFilter(dwBrowseFilter),
ElementNameFilter = szElementNameFilter,
VendorFilter = szVendorFilter,
ReturnAllProperties = bReturnAllProperties != 0,
ReturnPropertyValues = bReturnPropertyValues != 0,
PropertyIDs = OpcCom.Da.Interop.GetPropertyIDs(pdwPropertyIDs)
};
Opc.Da.BrowsePosition position = null;
BrowseElement[] input = null;
string key = null;
if (pszContinuationPoint != IntPtr.Zero)
{
key = Marshal.PtrToStringUni(pszContinuationPoint);
}
if ((key == null) || (key.Length == 0))
{
input = this.m_server.Browse(itemID, filters, out position);
}
else
{
ContinuationPoint point = (ContinuationPoint)this.m_continuationPoints[key];
if (point != null)
{
position = point.Position;
this.m_continuationPoints.Remove(key);
}
if (position == null)
{
throw new ExternalException("E_INVALIDCONTINUATIONPOINT", -1073478653);
}
Marshal.FreeCoTaskMem(pszContinuationPoint);
pszContinuationPoint = IntPtr.Zero;
position.MaxElementsReturned = dwMaxElementsReturned;
input = this.m_server.BrowseNext(ref position);
}
this.CleanupContinuationPoints();
if (position != null)
{
key = Guid.NewGuid().ToString();
this.m_continuationPoints[key] = new ContinuationPoint(position);
pszContinuationPoint = Marshal.StringToCoTaskMemUni(key);
}
if (pszContinuationPoint == IntPtr.Zero)
{
pszContinuationPoint = Marshal.StringToCoTaskMemUni(string.Empty);
}
pbMoreElements = 0;
pdwCount = 0;
ppBrowseElements = IntPtr.Zero;
if (input != null)
{
pdwCount = input.Length;
ppBrowseElements = OpcCom.Da.Interop.GetBrowseElements(input, dwPropertyCount > 0);
}
}
catch (Exception exception)
{
throw CreateException(exception);
}
finally
{
Monitor.Exit(server);
}
}
/// <summary>
/// Finds the references that meet the browse criteria.
/// </summary>
private IList<BrowseElement> Browse(
NodeId startId,
ref ContinuationPoint cp,
int dwMaxElementsReturned,
OPCBROWSEFILTER dwBrowseFilter,
string szElementNameFilter)
{
IList<BrowseElement> filteredResults = new List<BrowseElement>();
IList<BrowseElement> unprocessedResults = new List<BrowseElement>();
byte[] continuationPoint = null;
while (dwMaxElementsReturned == 0 || filteredResults.Count < dwMaxElementsReturned)
{
ReferenceDescriptionCollection currentBatch = null;
if (cp == null)
{
currentBatch = Browse(startId, dwMaxElementsReturned, out continuationPoint);
if (continuationPoint != null)
{
cp = new ContinuationPoint();
cp.LastCP = continuationPoint;
cp.UnprocessedElements = null;
}
}
else
{
if (cp.UnprocessedElements != null)
{
// add any unprocessed results from the previous call.
for (int ii = 0; ii < cp.UnprocessedElements.Count; ii++)
{
if (dwMaxElementsReturned == 0 || filteredResults.Count < dwMaxElementsReturned)
{
filteredResults.Add(cp.UnprocessedElements[ii]);
}
else
{
unprocessedResults.Add(cp.UnprocessedElements[ii]);
}
}
// check if all done.
if (unprocessedResults.Count == 0 && cp.LastCP == null)
{
cp = null;
break;
}
// check for max results.
if (unprocessedResults.Count > 0)
{
cp = new ContinuationPoint();
cp.LastCP = null;
cp.UnprocessedElements = unprocessedResults;
break;
}
}
// get the next batch.
if (cp != null && cp.LastCP != null)
{
continuationPoint = cp.LastCP;
currentBatch = BrowseNext(ref continuationPoint);
if (continuationPoint != null)
{
cp = new ContinuationPoint();
cp.LastCP = continuationPoint;
cp.UnprocessedElements = null;
}
}
}
// apply the filters.
ApplyFilters(
currentBatch,
dwBrowseFilter,
szElementNameFilter,
dwMaxElementsReturned,
filteredResults,
unprocessedResults);
// check if all done.
if (unprocessedResults.Count == 0 && (cp == null || cp.LastCP == null))
{
cp = null;
break;
}
// check for max results.
if (unprocessedResults.Count > 0)
{
cp = new ContinuationPoint();
cp.LastCP = continuationPoint;
cp.UnprocessedElements = unprocessedResults;
break;
}
}
return filteredResults;
}
public void Browse(string szItemID, ref IntPtr pszContinuationPoint, int dwMaxElementsReturned, OPCBROWSEFILTER dwBrowseFilter, string szElementNameFilter, string szVendorFilter, int bReturnAllProperties, int bReturnPropertyValues, int dwPropertyCount, int[] pdwPropertyIDs, out int pbMoreElements, out int pdwCount, out IntPtr ppBrowseElements)
{
lock (this)
{
try
{
ItemIdentifier itemID = new ItemIdentifier(szItemID);
BrowseFilters browseFilters = new BrowseFilters();
browseFilters.MaxElementsReturned = dwMaxElementsReturned;
browseFilters.BrowseFilter = Interop.GetBrowseFilter(dwBrowseFilter);
browseFilters.ElementNameFilter = szElementNameFilter;
browseFilters.VendorFilter = szVendorFilter;
browseFilters.ReturnAllProperties = (bReturnAllProperties != 0);
browseFilters.ReturnPropertyValues = (bReturnPropertyValues != 0);
browseFilters.PropertyIDs = Interop.GetPropertyIDs(pdwPropertyIDs);
Opc.Da.BrowsePosition position = null;
BrowseElement[] array = null;
string text = null;
if (pszContinuationPoint != IntPtr.Zero)
{
text = Marshal.PtrToStringUni(pszContinuationPoint);
}
if (text == null || text.Length == 0)
{
array = m_server.Browse(itemID, browseFilters, out position);
}
else
{
ContinuationPoint continuationPoint = (ContinuationPoint)m_continuationPoints[text];
if (continuationPoint != null)
{
position = continuationPoint.Position;
m_continuationPoints.Remove(text);
}
if (position == null)
{
throw new ExternalException("E_INVALIDCONTINUATIONPOINT", -1073478653);
}
Marshal.FreeCoTaskMem(pszContinuationPoint);
pszContinuationPoint = IntPtr.Zero;
position.MaxElementsReturned = dwMaxElementsReturned;
array = m_server.BrowseNext(ref position);
}
CleanupContinuationPoints();
if (position != null)
{
text = Guid.NewGuid().ToString();
m_continuationPoints[text] = new ContinuationPoint(position);
pszContinuationPoint = Marshal.StringToCoTaskMemUni(text);
}
if (pszContinuationPoint == IntPtr.Zero)
{
pszContinuationPoint = Marshal.StringToCoTaskMemUni(string.Empty);
}
pbMoreElements = 0;
pdwCount = 0;
ppBrowseElements = IntPtr.Zero;
if (array != null)
{
pdwCount = array.Length;
ppBrowseElements = Interop.GetBrowseElements(array, dwPropertyCount > 0);
}
}
catch (Exception e)
{
throw CreateException(e);
}
}
}
