/// <summary>
/// Changes the filter used to select the events.
/// </summary>
public void ChangeFilter(FilterDeclaration filter, bool fetchRecent)
{
m_filter = filter;
EventsLV.Items.Clear();
int index = 0;
if (m_filter != null)
{
// add or update existing columns.
for (int ii = 0; ii < m_filter.Fields.Count; ii++)
{
if (m_filter.Fields[ii].DisplayInList)
{
if (index >= EventsLV.Columns.Count)
{
EventsLV.Columns.Add(new ColumnHeader());
}
EventsLV.Columns[index].Text = m_filter.Fields[ii].InstanceDeclaration.DisplayName;
EventsLV.Columns[index].TextAlign = HorizontalAlignment.Left;
index++;
}
}
}
// remove extra columns.
while (index < EventsLV.Columns.Count)
{
EventsLV.Columns.RemoveAt(EventsLV.Columns.Count - 1);
}
// adjust the width of the columns.
for (int ii = 0; ii < EventsLV.Columns.Count; ii++)
{
EventsLV.Columns[ii].Width = -2;
}
// fetch recent history.
if (fetchRecent)
{
ReadRecentHistory();
}
// update subscription.
if (m_subscription != null && m_filter != null)
{
m_monitoredItem.Filter = m_filter.GetFilter();
m_subscription.ApplyChanges();
}
}
/// <summary>
/// Creates the subscription.
/// </summary>
private void CreateSubscription()
{
// create the default subscription.
m_subscription = new Subscription();
m_subscription.DisplayName = null;
m_subscription.PublishingInterval = 1000;
m_subscription.KeepAliveCount = 10;
m_subscription.LifetimeCount = 100;
m_subscription.MaxNotificationsPerPublish = 1000;
m_subscription.PublishingEnabled = true;
m_subscription.TimestampsToReturn = TimestampsToReturn.Both;
m_session.AddSubscription(m_subscription);
m_subscription.Create();
// a table used to track event types.
m_eventTypeMappings = new Dictionary <NodeId, NodeId>();
NodeId knownEventId = ExpandedNodeId.ToNodeId(ObjectTypeIds.SystemCycleStatusEventType, m_session.NamespaceUris);
m_knownEventTypes = new Dictionary <NodeId, Type>();
m_knownEventTypes.Add(knownEventId, typeof(SystemCycleStatusEventState));
TypeDeclaration type = new TypeDeclaration();
type.NodeId = ExpandedNodeId.ToNodeId(ObjectTypeIds.SystemCycleStatusEventType, m_session.NamespaceUris);
type.Declarations = ClientUtils.CollectInstanceDeclarationsForType(m_session, type.NodeId);
// the filter to use.
m_filter = new FilterDeclaration(type, null);
// declate callback.
m_MonitoredItem_Notification = new MonitoredItemNotificationEventHandler(MonitoredItem_Notification);
// create a monitored item based on the current filter settings.
m_monitoredItem = new MonitoredItem();
m_monitoredItem.StartNodeId = Opc.Ua.ObjectIds.Server;
m_monitoredItem.AttributeId = Attributes.EventNotifier;
m_monitoredItem.SamplingInterval = 0;
m_monitoredItem.QueueSize = 1000;
m_monitoredItem.DiscardOldest = true;
m_monitoredItem.Filter = m_filter.GetFilter();
// set up callback for notifications.
m_monitoredItem.Notification += m_MonitoredItem_Notification;
m_subscription.AddItem(m_monitoredItem);
m_subscription.ApplyChanges();
}
/// <summary>
/// Updates the items with the current filter.
/// </summary>
private void UpdateItems()
{
List <FilterDeclarationField> fields = new List <FilterDeclarationField>();
foreach (FilterDeclarationField field in m_filter.Fields)
{
// only keep fields that are used.
if (field.Selected || field.FilterEnabled)
{
fields.Add(field);
continue;
}
// add mandatory fields.
switch (field.InstanceDeclaration.BrowsePathDisplayText)
{
case Opc.Ua.BrowseNames.EventId:
case Opc.Ua.BrowseNames.EventType:
case Opc.Ua.BrowseNames.Time:
{
field.Selected = true;
fields.Add(field);
break;
}
}
}
m_filter.Fields = fields;
// construct filter.
EventFilter filter = m_filter.GetFilter();
// update items.
for (int ii = 0; ii < m_dataset.Tables[0].Rows.Count; ii++)
{
MonitoredItem monitoredItem = (MonitoredItem)m_dataset.Tables[0].Rows[ii][0];
monitoredItem.Filter = filter;
}
// apply changes.
m_subscription.ApplyChanges();
// show results.
for (int ii = 0; ii < m_dataset.Tables[0].Rows.Count; ii++)
{
DataRow row = m_dataset.Tables[0].Rows[ii];
MonitoredItem monitoredItem = (MonitoredItem)row[0];
UpdateRow(row, monitoredItem.Status);
}
}
/// <summary>
/// Fetches the recent history.
/// </summary>
private void ReadRecentHistory()
{
// check if session is active.
if (m_session != null)
{
// check if area supports history.
IObject area = m_session.NodeCache.Find(m_areaId) as IObject;
if (area != null && ((area.EventNotifier & EventNotifiers.HistoryRead) != 0))
{
// get the last hour or 10 events.
ReadEventDetails details = new ReadEventDetails();
details.StartTime = DateTime.UtcNow.AddSeconds(30);
details.EndTime = details.StartTime.AddHours(-1);
details.NumValuesPerNode = 10;
details.Filter = m_filter.GetFilter();
// read the history.
ReadHistory(details, m_areaId);
}
}
}
/// <summary>
/// Creates the subscription.
/// </summary>
private void CreateSubscription()
{
// create the default subscription.
m_subscription = new Subscription();
m_subscription.DisplayName = null;
m_subscription.PublishingInterval = 1000;
m_subscription.KeepAliveCount = 10;
m_subscription.LifetimeCount = 100;
m_subscription.MaxNotificationsPerPublish = 1000;
m_subscription.PublishingEnabled = true;
m_subscription.TimestampsToReturn = TimestampsToReturn.Both;
m_session.AddSubscription(m_subscription);
m_subscription.Create();
// a table used to track event types.
m_eventTypeMappings = new Dictionary<NodeId, NodeId>();
NodeId knownEventId = ExpandedNodeId.ToNodeId(ObjectTypeIds.SystemCycleStatusEventType, m_session.NamespaceUris);
m_knownEventTypes = new Dictionary<NodeId, Type>();
m_knownEventTypes.Add(knownEventId, typeof(SystemCycleStatusEventState));
TypeDeclaration type = new TypeDeclaration();
type.NodeId = ExpandedNodeId.ToNodeId(ObjectTypeIds.SystemCycleStatusEventType, m_session.NamespaceUris);
type.Declarations = ClientUtils.CollectInstanceDeclarationsForType(m_session, type.NodeId);
// the filter to use.
m_filter = new FilterDeclaration(type, null);
// declate callback.
m_MonitoredItem_Notification = new MonitoredItemNotificationEventHandler(MonitoredItem_Notification);
// create a monitored item based on the current filter settings.
m_monitoredItem = new MonitoredItem();
m_monitoredItem.StartNodeId = Opc.Ua.ObjectIds.Server;
m_monitoredItem.AttributeId = Attributes.EventNotifier;
m_monitoredItem.SamplingInterval = 0;
m_monitoredItem.QueueSize = 1000;
m_monitoredItem.DiscardOldest = true;
m_monitoredItem.Filter = m_filter.GetFilter();
// set up callback for notifications.
m_monitoredItem.Notification += m_MonitoredItem_Notification;
m_subscription.AddItem(m_monitoredItem);
m_subscription.ApplyChanges();
}