public IEnumerable <LogRowDataPoint> GetDataPoints(IEnumerable <LogRowIndex> indexes)
{
foreach (LogRowIndex logRowIndex in indexes)
{
if (!m_DataPointCache.TryGetValue(logRowIndex.RowStart, out var reference))
{
LogRowDataPoint point = LogRowDataFactory.CreateDataPoint(m_PagedReader, logRowIndex);
reference = new WeakReference(point);
m_DataPointCache.Add(logRowIndex.RowStart, reference);
}
LogRowDataPoint dataPoint = reference.Target as LogRowDataPoint;
//Reload data point
if (dataPoint == null)
{
dataPoint = LogRowDataFactory.CreateDataPoint(m_PagedReader, logRowIndex);
reference.Target = dataPoint;
}
yield return(dataPoint);
}
}
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;
}
}
