public FileMetadata UpdateMetadata(string username, FileMetadata aFileMetadata, FileBlobdata aFileBlobdata)
{
//if NO conflict, save the Metadata in local database & save Blobdata in Blob Server, then update FileMetadata and return
//if conflict, reject this update and return error reason in FileMetadata. Then let client to rename the file and upate again
//Future Plan: Maybe the Blobdata can be saved to avoid upload again, but need a mechanism to collect garbage if client does not update again.
return null;
}
public static SHA256 GetSHA(FileMetadata metadata, FileBlobdata blobdata)
{
//The SHA will be used to be the blobKey
//Only some parts of metadata should be used in calculating SHA: filename, parent, globalCounter, timestamp, fileData.
//The other fileds of the metadata maybe updated in future.
//Reference http://msdn.microsoft.com/en-us/library/system.security.cryptography.sha256%28v=vs.110%29.aspx
return null;
}
// local metadata should be udate on delete a file
public bool DeleteMetadate(string username, FileMetadata aFileMetadata)
{
return false;
}
public bool UpdateFile(string filename, FileMetadata blobInfo)
{
//write file from cloud (specifed by BlobInfo) to local disk
return false;
}
public FileMetadata UploadFile(FileMetadata aFileMetadata, FileBlobdata aFileBlobdata)
{
return null;
}
public bool DeleteFile(FileMetadata aFileMetadata)
{
return false;
}
public bool DownloadFile(FileMetadata blobInfo)
{
return true;
}
// local metadata should be udate on create / update a file. There metadata is from master server, for the SHA is calculated on master server.
public bool UpdateMetadata(FileMetadata aFileMetadata)
{
//overwrite into sLocalMetadata
SaveLocalMetadate();
return false;
}
// local metadata should be udate on delete a file
public bool DeleteMetadate(FileMetadata aFileMetadata)
{
//delete from sLocalMetadata
SaveLocalMetadate();
return false;
}