/// <summary>
/// Initializes a new instance of the <see cref="BlockState"/> class.
/// </summary>
/// <param name="nodeManager">The context.</param>
/// <param name="nodeId">The node id.</param>
/// <param name="block">The block.</param>
public BlockState(
DataAccessServerNodeManager nodeManager,
NodeId nodeId,
UnderlyingSystemBlock block) : base(null)
{
m_blockId = block.Id;
m_nodeManager = nodeManager;
this.SymbolicName = block.Name;
this.NodeId = nodeId;
this.BrowseName = new QualifiedName(block.Name, nodeId.NamespaceIndex);
this.DisplayName = new LocalizedText(block.Name);
this.Description = null;
this.WriteMask = 0;
this.UserWriteMask = 0;
this.EventNotifier = EventNotifiers.None;
UnderlyingSystem system = nodeManager.SystemContext.SystemHandle as UnderlyingSystem;
if (system != null)
{
IList <UnderlyingSystemTag> tags = block.GetTags();
for (int ii = 0; ii < tags.Count; ii++)
{
BaseVariableState variable = CreateVariable(nodeManager.SystemContext, tags[ii]);
AddChild(variable);
variable.OnSimpleWriteValue = OnWriteTagValue;
}
}
}
/// <summary>
/// Used to receive notifications when the value attribute is read or written.
/// </summary>
public ServiceResult OnWriteTagValue(
ISystemContext context,
NodeState node,
ref object value)
{
UnderlyingSystem system = context.SystemHandle as UnderlyingSystem;
if (system == null)
{
return(StatusCodes.BadCommunicationError);
}
UnderlyingSystemBlock block = system.FindBlock(m_blockId);
if (block == null)
{
return(StatusCodes.BadNodeIdUnknown);
}
uint error = block.WriteTagValue(node.SymbolicName, value);
if (error != 0)
{
// the simulator uses UA status codes so there is no need for a mapping table.
return(error);
}
return(ServiceResult.Good);
}
/// <summary>
/// Starts the monitoring the block.
/// </summary>
/// <param name="context">The context.</param>
public void StartMonitoring(ServerSystemContext context)
{
if (m_monitoringCount == 0)
{
UnderlyingSystem system = context.SystemHandle as UnderlyingSystem;
if (system != null)
{
UnderlyingSystemBlock block = system.FindBlock(m_blockId);
if (block != null)
{
block.StartMonitoring(OnTagsChanged);
}
}
}
m_monitoringCount++;
}
/// <summary>
/// Stop the monitoring the block.
/// </summary>
/// <param name="context">The context.</param>
public bool StopMonitoring(ServerSystemContext context)
{
m_monitoringCount--;
if (m_monitoringCount == 0)
{
UnderlyingSystem system = context.SystemHandle as UnderlyingSystem;
if (system != null)
{
UnderlyingSystemBlock block = system.FindBlock(m_blockId);
if (block != null)
{
block.StopMonitoring();
}
}
}
return(m_monitoringCount != 0);
}
/// <summary>
/// Initializes the node manager.
/// </summary>
public DataAccessServerNodeManager(IServerInternal server, ApplicationConfiguration configuration)
:
base(server, configuration, Namespaces.DataAccess)
{
this.AliasRoot = "DA";
SystemContext.SystemHandle = m_system = new UnderlyingSystem();
SystemContext.NodeIdFactory = this;
// get the configuration for the node manager.
m_configuration = configuration.ParseExtension <DataAccessServerConfiguration>();
// use suitable defaults if no configuration exists.
if (m_configuration == null)
{
m_configuration = new DataAccessServerConfiguration();
}
// create the table to store the cached blocks.
m_blocks = new Dictionary <NodeId, BlockState>();
}
/// <summary>
/// Initializes the node manager.
/// </summary>
public DataAccessServerNodeManager(IServerInternal server, ApplicationConfiguration configuration)
:
base(server, configuration, Namespaces.DataAccess)
{
this.AliasRoot = "DA";
SystemContext.SystemHandle = m_system = new UnderlyingSystem();
SystemContext.NodeIdFactory = this;
// get the configuration for the node manager.
m_configuration = configuration.ParseExtension<DataAccessServerConfiguration>();
// use suitable defaults if no configuration exists.
if (m_configuration == null)
{
m_configuration = new DataAccessServerConfiguration();
}
// create the table to store the cached blocks.
m_blocks = new Dictionary<NodeId, BlockState>();
}
/// <summary>
/// Populates the browser with references that meet the criteria.
/// </summary>
/// <param name="context">The context for the system being accessed.</param>
/// <param name="browser">The browser to populate.</param>
protected override void PopulateBrowser(ISystemContext context, NodeBrowser browser)
{
base.PopulateBrowser(context, browser);
// check if the parent segments need to be returned.
if (browser.IsRequired(ReferenceTypeIds.Organizes, true))
{
UnderlyingSystem system = context.SystemHandle as UnderlyingSystem;
if (system == null)
{
return;
}
// add reference for parent segment.
UnderlyingSystemSegment segment = system.FindParentForSegment(m_segmentPath);
if (segment != null)
{
browser.Add(ReferenceTypeIds.Organizes, true, ModelUtils.ConstructIdForSegment(segment.Id, this.NodeId.NamespaceIndex));
}
}
}
/// <summary>
/// Populates the browser with references that meet the criteria.
/// </summary>
/// <param name="context">The context for the system being accessed.</param>
/// <param name="browser">The browser to populate.</param>
protected override void PopulateBrowser(ISystemContext context, NodeBrowser browser)
{
base.PopulateBrowser(context, browser);
// check if the parent segments need to be returned.
if (browser.IsRequired(ReferenceTypeIds.Organizes, true))
{
UnderlyingSystem system = context.SystemHandle as UnderlyingSystem;
if (system == null)
{
return;
}
// add reference for each segment.
IList <UnderlyingSystemSegment> segments = system.FindSegmentsForBlock(m_blockId);
for (int ii = 0; ii < segments.Count; ii++)
{
browser.Add(ReferenceTypeIds.Organizes, true, ModelUtils.ConstructIdForSegment(segments[ii].Id, this.NodeId.NamespaceIndex));
}
}
}
/// <summary>
/// Returns the next reference.
/// </summary>
/// <returns>The next reference that meets the browse criteria.</returns>
public override IReference Next()
{
UnderlyingSystem system = (UnderlyingSystem)this.SystemContext.SystemHandle;
lock (DataLock)
{
IReference reference = null;
// enumerate pre-defined references.
// always call first to ensure any pushed-back references are returned first.
reference = base.Next();
if (reference != null)
{
return(reference);
}
if (m_stage == Stage.Begin)
{
m_segments = system.FindSegments(m_source.SegmentPath);
m_stage = Stage.Segments;
m_position = 0;
}
// don't start browsing huge number of references when only internal references are requested.
if (InternalOnly)
{
return(null);
}
// enumerate segments.
if (m_stage == Stage.Segments)
{
if (IsRequired(ReferenceTypeIds.Organizes, false))
{
reference = NextChild();
if (reference != null)
{
return(reference);
}
}
m_blocks = system.FindBlocks(m_source.SegmentPath);
m_stage = Stage.Blocks;
m_position = 0;
}
// enumerate blocks.
if (m_stage == Stage.Blocks)
{
if (IsRequired(ReferenceTypeIds.Organizes, false))
{
reference = NextChild();
if (reference != null)
{
return(reference);
}
m_stage = Stage.Done;
m_position = 0;
}
}
// all done.
return(null);
}
}
/// <summary>
/// Returns the next child.
/// </summary>
private IReference NextChild()
{
UnderlyingSystem system = (UnderlyingSystem)this.SystemContext.SystemHandle;
NodeId targetId = null;
// check if a specific browse name is requested.
if (!QualifiedName.IsNull(base.BrowseName))
{
// check if match found previously.
if (m_position == Int32.MaxValue)
{
return(null);
}
// browse name must be qualified by the correct namespace.
if (m_source.BrowseName.NamespaceIndex != base.BrowseName.NamespaceIndex)
{
return(null);
}
// look for matching segment.
if (m_stage == Stage.Segments && m_segments != null)
{
for (int ii = 0; ii < m_segments.Count; ii++)
{
if (base.BrowseName.Name == m_segments[ii].Name)
{
targetId = ModelUtils.ConstructIdForSegment(m_segments[ii].Id, m_source.NodeId.NamespaceIndex);
break;
}
}
}
// look for matching block.
if (m_stage == Stage.Blocks && m_blocks != null)
{
for (int ii = 0; ii < m_blocks.Count; ii++)
{
UnderlyingSystemBlock block = system.FindBlock(m_blocks[ii]);
if (block != null && base.BrowseName.Name == block.Name)
{
targetId = ModelUtils.ConstructIdForBlock(m_blocks[ii], m_source.NodeId.NamespaceIndex);
break;
}
}
}
m_position = Int32.MaxValue;
}
// return the child at the next position.
else
{
// look for next segment.
if (m_stage == Stage.Segments && m_segments != null)
{
if (m_position >= m_segments.Count)
{
return(null);
}
targetId = ModelUtils.ConstructIdForSegment(m_segments[m_position++].Id, m_source.NodeId.NamespaceIndex);
}
// look for next block.
else if (m_stage == Stage.Blocks && m_blocks != null)
{
if (m_position >= m_blocks.Count)
{
return(null);
}
targetId = ModelUtils.ConstructIdForBlock(m_blocks[m_position++], m_source.NodeId.NamespaceIndex);
}
}
// create reference.
if (targetId != null)
{
return(new NodeStateReference(ReferenceTypeIds.Organizes, false, targetId));
}
return(null);
}