public SampleHistorian(OpcNodeManager owner, OpcVariableNode node)
: base()
{
this.Owner = owner;
this.Node = node;
this.Node.AccessLevel |= OpcAccessLevel.HistoryReadOrWrite;
this.Node.UserAccessLevel |= OpcAccessLevel.HistoryReadOrWrite;
this.Node.IsHistorizing = true;
this.syncRoot = new object();
this.History = SampleHistory <OpcHistoryValue>
.Create(@".\History.db", node.Id);
this.ModifiedHistory = SampleHistory <OpcModifiedHistoryValue>
.Create(@".\History.Modified.db", node.Id);
}
internal bool CanWrite(OpcVariableNode node, OpcUserIdentity sessionIdentity)
{
var entries = this.AccessControl.Entries;
foreach (var entry in entries)
{
if (entry.Principal.Identity is SystemIdentity serverIdentity)
{
if (serverIdentity.DisplayName == sessionIdentity.DisplayName)
{
return(entry.IsAllowed(OpcRequestType.Write) &&
serverIdentity.IsAllowed(node.Id.ValueAsString));
}
}
}
return(false);
}
