/// <summary>
/// Creates a new record in the archive.
/// </summary>
public void CreateRecord(NodeId nodeId, BuiltInType dataType)
{
lock (m_lock)
{
HistoryRecord record = new HistoryRecord();
record.RawData = new List<HistoryEntry>();
record.Historizing = true;
record.DataType = dataType;
DateTime now = DateTime.UtcNow;
for (int ii = 1000; ii >= 0; ii--)
{
HistoryEntry entry = new HistoryEntry();
entry.Value = new DataValue();
entry.Value.ServerTimestamp = now.AddSeconds(-(ii*10));
entry.Value.SourceTimestamp = entry.Value.ServerTimestamp.AddMilliseconds(1234);
entry.IsModified = false;
switch (dataType)
{
case BuiltInType.Int32:
{
entry.Value.Value = ii;
break;
}
}
record.RawData.Add(entry);
}
if (m_records == null)
{
m_records = new Dictionary<NodeId,HistoryRecord>();
}
m_records[nodeId] = record;
if (m_updateTimer == null)
{
m_updateTimer = new Timer(OnUpdate, null, 10000, 10000);
}
}
}
/// <summary>
/// Periodically adds new values into the archive.
/// </summary>
private void OnUpdate(object state)
{
try
{
DateTime now = DateTime.UtcNow;
lock (m_lock)
{
foreach (HistoryRecord record in m_records.Values)
{
if (!record.Historizing || record.RawData.Count >= 2000)
{
continue;
}
HistoryEntry entry = new HistoryEntry();
entry.Value = new DataValue();
entry.Value.ServerTimestamp = now;
entry.Value.SourceTimestamp = entry.Value.ServerTimestamp.AddMilliseconds(-4567);
entry.IsModified = false;
switch (record.DataType)
{
case BuiltInType.Int32:
{
int lastValue = (int)record.RawData[record.RawData.Count-1].Value.Value;
entry.Value.Value = lastValue+1;
break;
}
}
record.RawData.Add(entry);
}
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error updating history.");
}
}