Hello Sai, Actually they don't, if you have access to a unix box you can check yourself that it is possible to e.g, move a file which is being currently written. It is windows systems that do prevent concurrent access to files being written - I don't know about other OSes.
With FileChannel lock() or tryLock() you can enforce the OS to lock files, but still we probably cannot depend on the user using a 'real filesystem'. For example, we cannot use File.createTempFile() in STOU because the user could be persisting to a database, to a VFS filesystem, to HDFS ... Still, my question here is: Should we provide an abstraction for file locking or allow the filesystem implementation to deal with it internally? 2009/4/16 Sai Pullabhotla <sai.pullabho...@jmethods.com>: > I believe all operating systems handle the file locking on files to prevent > concurrent writing. So, if more than one users/sessions try to write to the > same file, who ever opens the file first for writing would win and the rest > would fail. So not sure if we need to implement what you have mentioned. > > Thanks. > > Sai Pullabhotla > Phone: (402) 408-5753 > Fax: (402) 408-6861 > www.jMethods.com > > > > On Mon, Apr 13, 2009 at 3:52 AM, David Latorre (JIRA) <j...@apache.org>wrote: > >> Implement locking mechanism for files. >> -------------------------------------- >> >> Key: FTPSERVER-289 >> URL: https://issues.apache.org/jira/browse/FTPSERVER-289 >> Project: FtpServer >> Issue Type: New Feature >> Components: Core >> Affects Versions: 1.0.0 >> Reporter: David Latorre >> Fix For: WISHLIST >> >> >> >> In order to solve FTPSERVER-288 , this is, to prevent the possibility of >> race conditions in STOU command ( it is possible that non-unique filenames >> be generated with the current implementation) we would eventually need that >> there was some file locking mechanism which might be a mechanism to keep >> track of in-use files. >> >> >> >> -- >> This message is automatically generated by JIRA. >> - >> You can reply to this email to add a comment to the issue online. >> >> >
