Use NIO for file copying/moving
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Key: TRANSACTION-12
URL: http://issues.apache.org/jira/browse/TRANSACTION-12
Project: Commons Transaction
Issue Type: Wish
Affects Versions: 1.2
Reporter: Holger Hoffstätte
Attachments: moveByRenameAndNIO.txt
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. :-)
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