Use NIO for file copying/moving

• Key: TRANSACTION-12
• Type: Wish
• Status: Resolved
• Resolution: Fixed
• Priority: Major
• Assignee: Unassigned
• Reporter: Holger Hoffstätte
• Affects Version/s: 1.2
• Fix Version/s: 2.0

Description

The Mule project (http://mule.codehaus.org/) is considering adoption of commons-transaction for (among other things) file transactions. Unfortunately inspection of the code reveals that FileHelper copies files in the slowest possible way (traditional Java I/O via Input/OutputStreams). Since some of our users move lots and/or large files (hundreds of megabytes to gigabytes) we implemented file moving by rename (atomic and obviously very fast when source and target are on the same filesystem) and NIO as backup strategy (a lot less CPU usage).
Attached is a code snippet that outlines the procedure; it would be cool if c-tx could adopt a similar strategy for moving via rename-first and copy via NIO. I do not know if and how this might conflict with c-tx's "transactional" behaviour and recovery but then again it is just a suggestion.