public FileSystemErrorStatus LoadLeafSubGridSegment(IStorageProxy storageProxy,
SubGridCellAddress cellAddress,
bool loadLatestData,
bool loadAllPasses,
IServerLeafSubGrid subGrid,
ISubGridCellPassesDataSegment segment)
{
//Log.LogInformation($"Segment load on {cellAddress}:{Segment.SegmentInfo.StartTime}-{Segment.SegmentInfo.EndTime} beginning, loadLatestData = {loadLatestData}, loadAllPasses = {loadAllPasses}");
var needToLoadLatestData = loadLatestData && !segment.HasLatestData;
var needToLoadAllPasses = loadAllPasses && !segment.HasAllPasses;
if (!needToLoadLatestData && !needToLoadAllPasses)
{
//Log.LogInformation($"Segment load on {cellAddress} exiting as neither latest nor all passes required");
return(FileSystemErrorStatus.OK); // Nothing more to do here
}
// Lock the segment briefly while its contents is being loaded
lock (segment)
{
if (!(needToLoadLatestData ^ segment.HasLatestData) && !(needToLoadAllPasses ^ segment.HasAllPasses))
{
//Log.LogInformation($"Segment load on {cellAddress} leaving quietly as a previous thread has performed the load");
return(FileSystemErrorStatus.OK); // The load operation was performed on another thread. Leave quietly
}
// Ensure the appropriate storage is allocated
if (needToLoadLatestData)
{
segment.AllocateLatestPassGrid();
}
if (needToLoadAllPasses)
{
segment.AllocateFullPassStacks();
}
if (!segment.SegmentInfo.ExistsInPersistentStore)
{
//Log.LogInformation($"Segment load on {cellAddress} exiting as segment does not exist in persistent store");
return(FileSystemErrorStatus.OK); // Nothing more to do here
}
// Locate the segment file and load the data from it
var fullFileName = GetLeafSubGridSegmentFullFileName(cellAddress, segment.SegmentInfo);
// Load the cells into it from its file
var fsError = subGrid.LoadSegmentFromStorage(storageProxy, fullFileName, segment, needToLoadLatestData, needToLoadAllPasses);
if (fsError != FileSystemErrorStatus.OK)
{
//Log.LogInformation($"Segment load on {cellAddress} failed, performing allocation cleanup activities");
// Something bad happened. Remove the segment from the list. Return failure to the caller.
if (loadAllPasses)
{
segment.DeAllocateFullPassStacks();
}
if (loadLatestData)
{
segment.DeAllocateLatestPassGrid();
}
return(fsError);
}
}
//Log.LogInformation($"Segment load on {cellAddress} succeeded, AllPasses?={Segment.HasAllPasses}, Segment.PassesData?Null={Segment.PassesData==null} ");
return(FileSystemErrorStatus.OK);
}