private void InitCompleted()
{
var fileInfo = new FileInfo(_filename);
if (!fileInfo.Exists)
{
throw new ChunkFileNotExistException(_filename);
}
_isCompleted = true;
using (var fileStream = new FileStream(_filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, _chunkConfig.ChunkReadBuffer, FileOptions.None))
{
using (var reader = new BinaryReader(fileStream))
{
_chunkHeader = ReadHeader(fileStream, reader);
_chunkFooter = ReadFooter(fileStream, reader);
CheckCompletedFileChunk();
}
}
_dataPosition = _chunkFooter.ChunkDataTotalSize;
_flushedDataPosition = _chunkFooter.ChunkDataTotalSize;
if (_isMemoryChunk)
{
LoadFileChunkToMemory();
}
else
{
SetFileAttributes();
}
InitializeReaderWorkItems();
_lastActiveTime = DateTime.Now;
}
private void InitNew(int chunkNumber)
{
var chunkDataSize = 0;
if (_chunkConfig.ChunkDataSize > 0)
{
chunkDataSize = _chunkConfig.ChunkDataSize;
}
else
{
chunkDataSize = _chunkConfig.ChunkDataUnitSize * _chunkConfig.ChunkDataCount;
}
_chunkHeader = new ChunkHeader(chunkNumber, chunkDataSize);
_isCompleted = false;
var fileSize = ChunkHeader.Size + _chunkHeader.ChunkDataTotalSize + ChunkFooter.Size;
var writeStream = default(Stream);
var tempFilename = string.Format("{0}.{1}.tmp", _filename, Guid.NewGuid());
var tempFileStream = default(FileStream);
try
{
if (_isMemoryChunk)
{
_cachedLength = fileSize;
_cachedData = Marshal.AllocHGlobal(_cachedLength);
writeStream = new UnmanagedMemoryStream((byte *)_cachedData, _cachedLength, _cachedLength, FileAccess.ReadWrite);
writeStream.Write(_chunkHeader.AsByteArray(), 0, ChunkHeader.Size);
}
else
{
var fileInfo = new FileInfo(_filename);
if (fileInfo.Exists)
{
File.SetAttributes(_filename, FileAttributes.Normal);
File.Delete(_filename);
}
tempFileStream = new FileStream(tempFilename, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.Read, _chunkConfig.ChunkWriteBuffer, FileOptions.None);
tempFileStream.SetLength(fileSize);
tempFileStream.Write(_chunkHeader.AsByteArray(), 0, ChunkHeader.Size);
tempFileStream.Flush(true);
tempFileStream.Close();
File.Move(tempFilename, _filename);
writeStream = new FileStream(_filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read, _chunkConfig.ChunkWriteBuffer, FileOptions.SequentialScan);
SetFileAttributes();
}
writeStream.Position = ChunkHeader.Size;
_dataPosition = 0;
_flushedDataPosition = 0;
_writerWorkItem = new WriterWorkItem(new ChunkFileStream(writeStream));
InitializeReaderWorkItems();
if (!_isMemoryChunk)
{
if (_chunkConfig.EnableCache)
{
var chunkSize = (ulong)GetChunkSize(_chunkHeader);
if (ChunkUtil.IsMemoryEnoughToCacheChunk(chunkSize, (uint)_chunkConfig.ChunkCacheMaxPercent))
{
try
{
_memoryChunk = CreateNew(_filename, chunkNumber, _chunkManager, _chunkConfig, true);
}
catch (OutOfMemoryException)
{
_cacheItems = new CacheItem[_chunkConfig.ChunkLocalCacheSize];
}
catch (Exception ex)
{
_logger.Error(string.Format("Failed to cache new chunk {0}", this), ex);
_cacheItems = new CacheItem[_chunkConfig.ChunkLocalCacheSize];
}
}
else
{
_cacheItems = new CacheItem[_chunkConfig.ChunkLocalCacheSize];
}
}
else
{
_cacheItems = new CacheItem[_chunkConfig.ChunkLocalCacheSize];
}
}
}
catch
{
if (!_isMemoryChunk)
{
if (tempFileStream != null)
{
Helper.EatException(() => tempFileStream.Close());
}
if (File.Exists(tempFilename))
{
Helper.EatException(() =>
{
File.SetAttributes(tempFilename, FileAttributes.Normal);
File.Delete(tempFilename);
});
}
}
throw;
}
_lastActiveTime = DateTime.Now;
}
private int GetChunkSize(ChunkHeader chunkHeader)
{
return(ChunkHeader.Size + chunkHeader.ChunkDataTotalSize + ChunkFooter.Size);
}