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https://issues.apache.org/jira/browse/CONFIGURATION-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600510#comment-13600510
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Mike Lucas commented on CONFIGURATION-532:
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I will probably implement one of the above options as a custom subclass for my
current project, and happy to contribute that as a patch (if it's deemed
useful). So if someone can comment one which option they'd prefer (a subclass
that always reloads on rollbacks vs. setting a control property on the strategy
instance), I'll work in that direction.
I'm currently leaning toward the {{setReloadOnRollback()}} option.
Also, I should point out that expectations of rollback behaviour may be more
prevalent at my company because I had written a custom
{{AutoReloadingProperties}} class a long time ago (not nearly as elegant as
Commons Config but virtually the same behaviour, including the refresh delay),
and it used a != comparison to decide if it should reload.
> FileChangedReloadingStrategy should support reloading of rolled-back (older
> timestamp) files
> --------------------------------------------------------------------------------------------
>
> Key: CONFIGURATION-532
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-532
> Project: Commons Configuration
> Issue Type: Improvement
> Components: File reloading
> Affects Versions: 1.9
> Reporter: Mike Lucas
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> Currently the {{FileChangedReloadingStrategy}} only reloads when the
> timestamp of the file on the filesystem is _newer_ than the timestamp it had
> when it was last loaded.
> This may not be the expected behaviour when, for example, an administrator
> makes a backup copy of the original configuration file before making changes.
> If the administrator wants to roll back to the original configuration, he may
> expect that copying/renaming the backup back to the original name, would
> cause the original configuration to take effect again.
> Another example where the current behaviour is problematic is when using a
> Deploy System (like we do at my company). We expect to be able to roll-back
> to a previous configuration by simply redeploying the Config artifact, but
> because the timestamps reflect when the Config artifact was _built_ (not when
> it was deployed), this roll-back will not work.
> The current behaviour could be kept as the default, simply adding
> {{setReloadOnRollback()}} or similarly named method to change the behaviour
> to reload when the timestamp is either older or newer (i.e. not equal to) the
> {{lastModified}} variable. Another option would to be to create subclass
> {{FileChangedOrRolledBackReloadingStrategy}} that overrides the
> {{hasChanged()}} method.
> In either option the actual change is to use {{!=}} instead of {{>}} in the
> {{hasChanged}} method's comparison:
> {code}
> return file.lastModified() > lastModified;
> {code}
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