internal static LogRowDataPoint CreateDataPoint(PagedStreamReader reader, LogRowIndex index)
{
byte[] buffer = new byte[index.RowLength];
char[] chars = new char[index.RowLength];
reader.Read(buffer, index.RowStart, index.RowLength);
int length = buffer.IndexOf((byte)'\r', 0);
if (length == -1)
{
length = buffer.IndexOf((byte)'\n', 0);
}
for (int i = 0; i < length; i++)
{
chars[i] = (char)buffer[i];
}
index.GetValues(out int timeStampIndex, out int nameIndex, out int userIndex, out int cycleIndex, out int valueIndex);
var timeStamp = ParseDate(chars, 0, LogRowIndex.TimeStampLength); //, "yyyy-MM-dd hh:mm:ss.fff", culture);
string valueString = new string(chars, valueIndex, length - valueIndex);
double value;
if (!double.TryParse(valueString, NumberStyles.Any, m_Culture, out double val))
{
value = valueString == "True" ? 1d : 0d;
}
else
{
value = val;
}
return(new LogRowDataPoint(timeStamp, value));
}
private void OnQueuedReadThreadExecute()
{
try
{
Trace.TraceInformation("QueuedReadThread started: {0}", m_DatabaseInstanceID);
using (var stream = new BufferedStream(new FileStream(m_Filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 4096, FileOptions.RandomAccess), 1024 * 1024))
{
//int handle;
WaitHandle[] handles = new WaitHandle[] { m_Quit, m_Event };
var pagedReader = new PagedStreamReader(stream, 4096);
while (WaitHandle.WaitAny(handles) == 1) // (handle = WaitHandle.WaitAny(handles)) == 0)
{
Thread.Sleep(200); //Wait to consolidate if more requests are coming in.
QueuedReadRequest[] requests = null;
lock (m_SyncObject)
{
if (m_Queue.Count > 0)
{
requests = m_Queue.ToArray();
m_Queue.Clear();
}
else
{
m_Event.Reset();
}
}
if (requests == null)
{
continue;
}
LinkedList <LogRowIndex> indicesList = new LinkedList <LogRowIndex>();
Dictionary <LogRowIndex, List <RequestPoints> > indexToRequestPoints = new Dictionary <LogRowIndex, List <RequestPoints> >();
foreach (var readRequest in requests)
{
var indices = m_Indexes.GetItemRows(readRequest.ItemID, readRequest.StartIndex, readRequest.Count);
var requestPoints = new RequestPoints(readRequest);
foreach (var logRowIndex in indices)
{
if (!indexToRequestPoints.TryGetValue(logRowIndex, out var list))
{
list = new List <RequestPoints>();
indexToRequestPoints.Add(logRowIndex, list);
}
list.Add(requestPoints);
}
indicesList.AddSorted(indices);
}
foreach (var logRowIndex in indicesList)
{
var point = LogRowDataFactory.CreateDataPoint(pagedReader, logRowIndex);
var list = indexToRequestPoints[logRowIndex];
foreach (var rp in list)
{
if (rp.Add(point))
{
rp.Send(m_DatabaseInstanceID);
}
}
}
foreach (var index in indexToRequestPoints)
{
index.Value.ForEach(points => points.Send(m_DatabaseInstanceID));
}
}
}
Trace.TraceInformation("QueuedReadThread ended: {0}", m_DatabaseInstanceID);
}
catch (Exception ex)
{
m_Log.Fatal(ex.Message, ex);
throw;
}
}
public LogDataCache(Stream stream)
{
m_Stream = stream;
m_PagedReader = new PagedStreamReader(m_Stream, 4096);
}
