private String GetRawFileNameFromBlobId(BlobId blobId, String fileName)
{
var id = blobId.Id;
var stringPadded = String.Format("{0:D15}", id / 1000);
StringBuilder directoryName = new StringBuilder(15);
for (int i = 0; i < Math.Min(stringPadded.Length, 15); i++)
{
directoryName.Append(stringPadded[i]);
if (i % _folderPrefixLength == (_folderPrefixLength - 1))
{
directoryName.Append(System.IO.Path.DirectorySeparatorChar);
}
}
var finalDirectory = Path.Combine(BaseDirectory, blobId.Format, directoryName.ToString());
Directory.EnsureDirectory(finalDirectory);
return(finalDirectory + id + "." + Path.GetFileName(fileName));
}
/// <summary>
/// Create a series of subdirectories that avoid cluttering thousands
/// of files inside the very same folder.
/// The logic is the following, we want at most 1000 file in a folder, so
/// we divide the id by 1000 and we pad to 15 number, then we subdivide
/// the resulting number in blok by 4, each folder will contain at maximum
/// 1000 folders or files.
/// </summary>
/// <param name="blobId"></param>
/// <returns></returns>
public String GetFileNameFromBlobId(BlobId blobId)
{
var id = blobId.Id;
var stringPadded = String.Format("{0:D15}", id / 1000);
StringBuilder directoryName = new StringBuilder(15);
for (int i = 0; i < Math.Min(stringPadded.Length, 15); i++)
{
directoryName.Append(stringPadded[i]);
if (i % 3 == 2)
{
directoryName.Append(System.IO.Path.DirectorySeparatorChar);
}
}
var finalDirectory = Path.Combine(_baseDirectory, blobId.Format, directoryName.ToString());
Directory.EnsureDirectory(finalDirectory);
return(finalDirectory + id + ".blob");
}
public DirectoryManager(String baseDirectory, Int32 folderPrefixLength)
{
BaseDirectory = baseDirectory;
_folderPrefixLength = folderPrefixLength;
Directory.EnsureDirectory(baseDirectory);
}
public DirectoryManager(String baseDirectory)
{
_baseDirectory = baseDirectory;
Directory.EnsureDirectory(baseDirectory);
}