JLAN Server v3.5 - Database Filesystems

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Tutorial: JLAN Server v3.5 - Database Filesystems

*JLAN Server* is a high performance Java based file server supporting Windows file sharing (SMB/CIFS), NFS and FTP protocols.

Tutorial Details:

Version 3.5 (January 2005)
The following features and enhancements were added in version 3.5 :-

New Database Filesystem Driver
The DBDiskDriver replaces the JDBCDiskDriver filesystem driver. The new DBDiskDriver accesses the database via a set of interfaces, there is no embedded SQL or JDBC access in the main driver class. A file loader interface provides the methods for the DBDiskDriver to access the file data, which may allow direct access to the file data or load/save the file data using a set of worker threads.

The database access interfaces allow the filesystem structure, file retention details, background load/save request queue, file data and file id to repository object id mapping to be contained within a database or repository. The base database interface provides methods to store the filesystem structure and retention details in a database.

The release includes three database interface implementations that provide support for mySQL, Oracle and Derby/Cloudscape databases.

There are file loader implementations that allow files/folders to be stored on the local filesystem (SimpleFileLoader) or using database BLOB fields to store the data within the database (DBFileLoader). There is also an abstract file loader that uses filesystem file id to object id mapping that provides all of the background load/save and caching support, only the loadFileData() and saveFileData() methods need to be implemented (ObjectIdFileLoader).
Win32 NetBIOS
The Win32 NetBIOS code used by the SMB/CIFS server now defaults to listening for incoming connections on all available LANAs, unless a particular LANA is specified in the configuration.

The Win32 NetBIOS session handler can now cope with the associated network adapter being disabled/going offline/cable disconnected. The session handler polls the available LANAs to wait for it's associated LANA to reappear, it will then reinitialize and allow incoming connections.
Change Notification
Fixed a number of bugs in the asynchronous notification mechanism used by the SMB/CIFS server to notify clients of changes to files/folders.
New IOCtlInterface
Added the optional IOCtlInterface that a filesystem driver can implement to provide processing of the I/O control request to allow existing I/O controls such as file compression and encryption support to be enabled, or new I/O controls to be implemented.
Documentation Updates
Added a new chapter to the Programmers Guide detailing the new database filesystem driver.

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