/// <summary>
/// Updates the session diagnostics summary structure.
/// </summary>
private bool UpdateSessionDiagnostics(
SessionDiagnosticsData diagnostics,
SessionDiagnosticsDataType[] sessionArray,
int index)
{
// get the latest snapshot.
object value = null;
ServiceResult result = diagnostics.UpdateCallback(
SystemContext,
diagnostics.Value.Variable,
ref value);
SessionDiagnosticsDataType newValue = value as SessionDiagnosticsDataType;
sessionArray[index] = newValue;
// check for changes.
if (Utils.IsEqual(newValue, diagnostics.Value.Value))
{
return false;
}
diagnostics.Value.Error = null;
// check for bad value.
if (ServiceResult.IsNotBad(result) && newValue == null)
{
result = StatusCodes.BadOutOfService;
}
// check for bad result.
if (ServiceResult.IsBad(result))
{
diagnostics.Value.Error = result;
newValue = null;
}
// update the value.
diagnostics.Value.Value = newValue;
diagnostics.Value.Timestamp = DateTime.UtcNow;
// notify any monitored items.
diagnostics.Value.ChangesComplete(SystemContext);
return true;
}
/// <summary>
/// Creates the diagnostics node for a subscription.
/// </summary>
public NodeId CreateSessionDiagnostics(
ServerSystemContext systemContext,
SessionDiagnosticsDataType diagnostics,
NodeValueSimpleEventHandler updateCallback,
SessionSecurityDiagnosticsDataType securityDiagnostics,
NodeValueSimpleEventHandler updateSecurityCallback)
{
NodeId nodeId = null;
lock (Lock)
{
SessionDiagnosticsObjectState sessionNode = new SessionDiagnosticsObjectState(null);
// create a new instance and assign ids.
nodeId = CreateNode(
systemContext,
null,
ReferenceTypeIds.HasComponent,
new QualifiedName(diagnostics.SessionName),
sessionNode);
diagnostics.SessionId = nodeId;
securityDiagnostics.SessionId = nodeId;
// check if diagnostics have been enabled.
if (!m_diagnosticsEnabled)
{
return nodeId;
}
// add reference to session summary object.
sessionNode.AddReference(
ReferenceTypeIds.HasComponent,
true,
ObjectIds.Server_ServerDiagnostics_SessionsDiagnosticsSummary);
// add reference from session summary object.
SessionsDiagnosticsSummaryState summary = (SessionsDiagnosticsSummaryState)FindPredefinedNode(
ObjectIds.Server_ServerDiagnostics_SessionsDiagnosticsSummary,
typeof(SessionsDiagnosticsSummaryState));
if (summary != null)
{
summary.AddReference(ReferenceTypeIds.HasComponent, false, sessionNode.NodeId);
}
// initialize diagnostics node.
SessionDiagnosticsVariableState diagnosticsNode = sessionNode.CreateChild(
systemContext,
BrowseNames.SessionDiagnostics) as SessionDiagnosticsVariableState;
// wrap diagnostics in a thread safe object.
SessionDiagnosticsVariableValue diagnosticsValue = new SessionDiagnosticsVariableValue(
diagnosticsNode,
diagnostics,
Lock);
// must ensure the first update gets sent.
diagnosticsValue.Value = null;
diagnosticsValue.Error = StatusCodes.BadWaitingForInitialData;
diagnosticsValue.CopyPolicy = Opc.Ua.VariableCopyPolicy.Never;
diagnosticsValue.OnBeforeRead = OnBeforeReadDiagnostics;
// initialize security diagnostics node.
SessionSecurityDiagnosticsState securityDiagnosticsNode = sessionNode.CreateChild(
systemContext,
BrowseNames.SessionSecurityDiagnostics) as SessionSecurityDiagnosticsState;
// wrap diagnostics in a thread safe object.
SessionSecurityDiagnosticsValue securityDiagnosticsValue = new SessionSecurityDiagnosticsValue(
securityDiagnosticsNode,
securityDiagnostics,
Lock);
// must ensure the first update gets sent.
securityDiagnosticsValue.Value = null;
securityDiagnosticsValue.Error = StatusCodes.BadWaitingForInitialData;
securityDiagnosticsValue.CopyPolicy = Opc.Ua.VariableCopyPolicy.Never;
securityDiagnosticsValue.OnBeforeRead = OnBeforeReadDiagnostics;
// save the session.
SessionDiagnosticsData sessionData = new SessionDiagnosticsData(
sessionNode,
diagnosticsValue,
updateCallback,
securityDiagnosticsValue,
updateSecurityCallback);
m_sessions.Add(sessionData);
// send initial update.
DoScan(true);
}
return nodeId;
}