Hi, I use a FTPClient for downloading a file existing in a directory of a FTP server (retrieveFileStream).
In fact, I suppose it is a classical FTP problem but following the configuration of the FTP server, the beginning of a downloading file is possible even if the uploaded file is incomplete (always uploading). For instance, with FileZilla Server it is possible to unvalidate a check box "Allow downloading of file which are open for writing by another process - Please notice that this can result in corrupt transfers". If I try to download a file which is again uploading, the downloaded file is incomplete. But I would try to know how detecting that a file is on the FTP server is uploading. In this case either I don't want to start the download or I wait for the end of the upload. So I try to rename the file (with FTPClient.rename) to his own name. So if it is possible to rename the file it is that the file is not locked by the upload, so the upload has ended. This method is okay for some servers but not all. FileZilla server refuses to rename a file to his own name even if there is no lock. So I would prefer trying to put a lock on the file before trying to download the file. So if the file is uploading, the lock will fail. The file is not uploading, the lock will success. But to put a lock on the file, I have to use the method getChannel().tryLock() from a File, or FileInputStream. But I just have an "InputStream" with the "FTPClient" method. How to put a lock on the InputStream ? Or have you got another way to solve the problem ? Thanks
