public UserFile FetchFile(
string clientId,
string filename,
string fileowner)
{
Logger.Debug("Fetching file : " + filename + " for client id :" + clientId +
" with owner " + fileowner
);
UserFile file = null;
UserFileSystem fs = getUserFSFromMapSynchronized(fileowner);
//Now there no need for taking any more locks of this class. Used
// synchronized methods of the file system class
if (fs != null)
{
file = fs.getFileCloneSynchronized(filename); //this is the cloned copy of file, do whatever you want
//this is the case when file is not present in the map
if (file == null)
{
throw new FileNotFoundException("File with name :" + filename +
" not found for owner : " + fileowner
);
}
//this is the case when file is present in the map but marked for deletion
if (file.filemetadata.markedForDeletion == true)
{
Logger.Debug("File, present but marked for deletion");
throw new FileNotFoundException("File with name :" + filename +
" marked for deletion for owner : " + fileowner
);
}
}
else //file system is not present for the user
{
throw new UserNotLoadedInMemoryException("Client not found in memory : " + clientId);
}
if (!fileowner.Equals(clientId))
{
bool access = file.checkUserAccessSynchronized(clientId);
if (!access)
{
throw new AccessViolationException("File : " + filename + " owned by " +
fileowner + "is not shared with " + clientId
);
}
}
if (file.filecontent == null || file.filecontent.Length == 0)
{
UserFile diskFile = this.persistentstoreinteraction.fetchFileFromDisk(fileowner, filename);
fs.filemap [filename].filecontent = diskFile.filecontent; //setting this in fs as well
file.filecontent = diskFile.filecontent;
fs.metadata.totalFileSystemSizeBytes += file.filecontent.Length;
}
return(file);
}
