Support expression evaluation in scan attribute
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Key: LBCLASSIC-258
URL: http://jira.qos.ch/browse/LBCLASSIC-258
Project: logback-classic
Issue Type: New Feature
Components: joran
Affects Versions: 0.9.28
Reporter: Stevo Slavic
Assignee: Logback dev list
At the moment (logback-classic 0.9.28) processScanAttrib method in
ConfigurationAction only checks if scan attribute is not empty and if it's not
equal to false (so true, but also any non empty string other than false) is
enough to enable configuration changes scanning.
Please add support for expression evaluation (like here:
http://logback.qos.ch/manual/configuration.html#conditional ) in scan attribute
for the same reason conditional processing of configuration files has been
added - so single configuration file can be used in different environments.
E.g. I'd like to configure scan attribute with following expression:
<configuration scan='property("app.env").equals("production")' scanPeriod='300
seconds'>
If janino is not on classpath, same logic can remain for backward
compatibility. If janino library is on classpath, and scan is not empty,
evaluation should occur - if scan attribute value evaluates to true, only then
scanning should be enabled; if scan is not empty and evaluates to false,
scanning should not be enabled; if scan is not empty and evaluates to neither
true nor false, or exception is thrown, error should be logged.
This would break backward compatibility only for users which configured scan
attribute with non-empty value, which is neither "true" nor "false".
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