/// <summary>
/// Gets the array of HashMap
/// </summary>
/// <param name="entryCount">The number of hash entries.</param>
/// <param name="blockSize">The size of the data blocks that were hashed.</param>
/// <param name="create">If true create hashmap on error.</param>
/// <param name="mapRev">The desired map revision.</param>
/// <returns></returns>
internal FileStream GetHashMapStream(out int entryCount, out int blockSize, bool create, ulong mapRev)
{
if (File.Exists(file))
{
FileStream stream = File.OpenRead(file);
if (HashFileHeader.ReadHeader(new BinaryReader(stream), out blockSize, out entryCount, mapRev))
{
return(stream);
}
stream.Close();
}
//Since we do not create hash map at server we are commenting this
/* if (create)
* this.CreateHashMap();
* else
* Delete();
*/
entryCount = 0;
blockSize = 0;
return(null);
}
/// <summary>
/// Create a hash map file using file stream
/// </summary>
/// <param name="mapSrcStream">File stream thru which hash map file will be created</param>
public void CreateHashMapFileWithStream(FileStream mapSrcStream)
{
// Makre sure that mapState is set to true for succes anf failure cases
if (mapSrcStream == null)
{
Log.log.Debug("CreateHashMapFileWithStream: The mapsrcstream is null");
MapState = true;
return;
}
int blockSize = CalculateBlockSize(mapSrcStream.Length);
try
{
string mapFile = file;
string tmpMapFile = mapFile + ".tmp";
// Copy the current file to a tmp name.
if (File.Exists(mapFile))
{
File.Move(mapFile, tmpMapFile);
}
BinaryWriter writer = new BinaryWriter(File.OpenWrite(tmpMapFile));
// Write the header.
HashFileHeader.WriteHeader(writer, blockSize, node.LocalIncarnation);
try
{
mapSrcStream.Position = 0;
HashMap.SerializeHashMap(mapSrcStream, writer, blockSize);
writer.Close();
File.Move(tmpMapFile, mapFile);
File.SetCreationTime(mapFile, node.CreationTime);
File.SetLastWriteTime(mapFile, node.LastWriteTime);
}
catch (Exception ex)
{
Log.log.Debug("CreateHashMapFileWithStream Exception in {0}--{1}", ex.Message, ex.StackTrace);
writer.Close();
writer = null;
File.Delete(mapFile);
if (File.Exists(tmpMapFile))
{
File.Move(tmpMapFile, mapFile);
}
MapState = true;
throw ex;
}
finally
{
if (File.Exists(tmpMapFile))
{
File.Delete(tmpMapFile);
}
}
}
finally
{
// Close the file.
mapSrcStream.Close();
}
MapState = true;
}
