public virtual TSet Read()
{
if (!_initialized)
{
throw new NotSupportedException("Reading from an uninitialized Session is not supported");
}
if (_data != null)
{
return(_data);
}
_data = new TSet();
if (!File.Exists(_fileName))
{
return(_data);
}
using (MemoryMappedFile memFile = MemoryMappedFile.CreateFromFile(_fileName, FileMode.Open, _mapName, 0, MemoryMappedFileAccess.Read))
using (MemoryMappedViewStream view = memFile.CreateViewStream(0, 0, MemoryMappedFileAccess.Read))
{
RuntimeHelpers.PrepareConstrainedRegions();
long headerSize = Unsafe.SizeOf <Header>();
TMap map = new TMap();
byte *ptr = (byte *)0;
try
{
view.SafeMemoryMappedViewHandle.AcquirePointer(ref ptr);
byte *loc = ptr;
Header info = Unsafe.Read <Header>(loc);
loc += headerSize;
byte[] metaBytes = new byte[info.MetaLen];
Marshal.Copy((IntPtr)loc, metaBytes, 0, info.MetaLen);
loc += info.MetaLen;
_data.MetaData = MetaFormatter.Deserialize <TMeta>(metaBytes);
int len = Unsafe.SizeOf <TStruct>();
for (int i = 0; i < info.ItemCount; ++i)
{
_data.Add(map.ToData(Unsafe.Read <TStruct>(loc), _data.MetaData));
loc += len;
}
}
finally
{
if (ptr != null)
{
view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
}
return(_data);
}
