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Ralph Goers commented on LOG4J2-112:
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Do you have a link to something on that Gary? I would love to read about it.
That said, in this case I would think the value in making it extensible would outweigh whatever
performance gain their might be.
> Why is FileRenameAction a final class?
> --------------------------------------
>
> Key: LOG4J2-112
> URL: https://issues.apache.org/jira/browse/LOG4J2-112
> Project: Log4j 2
> Issue Type: Question
> Components: Core
> Affects Versions: 2.0-beta2
> Reporter: David Johle
> Priority: Minor
> Labels: features
> Original Estimate: 5m
> Remaining Estimate: 5m
>
> First some backstory:
> I have a special need to allow the use of a common/shared log file within a clustered
environment. I have already taken other measures necessary to handle the simultaneous writing
of logging events to the same file w/o corruption. I have been using log4j 1.2.x for a while
for this purpose, and it's been working in a production environment for quite some time actually.
> What I did there is make my own DailyRollingSharedFileAppender (based on the old DailyRollingFileAppender)
that contains some custom logic & locking to provide a safe mechanism for handling file
rollovers on the shared files.
> I am currently in the process of upgrading to log4j2 for several reasons, and as such
am working to re-implement this concept by making a couple of custom classes to augment log4j2
accordingly. Given the new architecture (which is very nice, BTW) I think this should actually
a fairly straightforward process...
> 1) Create a SharedFileRenameAction that extends FileRenameAction (has my custom logic
& locking)
> 2) Create a SharedFileRolloverStrategy that extends DefaultRolloverStrategy (no gz/zip
support, uses SharedFileRenameAction)
> 3) Reference SharedFileRolloverStrategy in log4j2.xml for the appenders using shared
files
> So for this, I only need to override a few things in these classes, and as such I'd rather
extend them than completely write new ones. For #2 this is not an issue, but for #1 I have
hit a snag:
> public final class FileRenameAction extends ActionBase
> (note: using beta-2 here, in trunk ActionBase is now AbstractAction)
> I've marked this issue as "Question" for now, so here is that question:
> Why is FileRenameAction marked final?
> If there was no intentional restriction on extensibility here, then I'd like to make
this issue an "Improvement" instead, requesting that this class no longer have the final qualifier.
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