Mike Lucas created CONFIGURATION-532:
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Summary: 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
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 the actual change is to use {{!=}} instead of {{>}} in the
{{hasChanged}} method's comparison:
{code}
return file.lastModified() > lastModified;
{code}
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