Richard Sand created LOGBACK-1308:
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Summary: Allow LoggerContext subclasses to update newly-created
Loggers
Key: LOGBACK-1308
URL: https://jira.qos.ch/browse/LOGBACK-1308
Project: logback
Issue Type: Improvement
Components: logback-classic
Affects Versions: 1.3.0, 1.2.4
Environment: all
Reporter: Richard Sand
Assignee: Logback dev list
Attachments: LoggerContext.patch
I've a use case where I am adapting Logback with a legacy product's proprietary
log mechanism. I did this by creating a wrapper class around a Logger, creating
custom appenders which wrap the product's logging API, and directly attaching
the appenders necessary according to the product's configuration settings.
Now I am trying to enable 3rd-party plugins, which are written for this
product, to be able to directly use Logger.getLogger() to log, and not have to
even worry about the product's proprietary (and clunky) logging API. But this
proves difficult in Logback, because there is no hook to programmatically touch
the Logger instances at creation-time. A custom LoggerContext doesn't help
because the getLogger() method is final, and the Logger class itself is also
final, allowing no extensibility.
The patch I have supplied provides this hook by simply adding a method in
LoggerContext that is invoked directly after Logger.createChildByName(), which
by default is a no-op but can be overridden by custom contexts.
{{ /**}}
{{ * Allows subclasses to perform post-create modifications on newly-created
\{@link Logger} instances.}}
{{ * By default, this method does nothing}}
{{ * }}
{{ * @param childLogger}}
{{ */}}
{{ protected void customizeNewLogger(final Logger childLogger) \{}}
{{ }}}
Inside the getLogger() method, this is invoked directly after creation:
{{ childLogger = logger.getChildByName(childName);}}
{{ if (childLogger == null) \{}}
{{ childLogger = logger.createChildByName(childName);}}
{{{color:#d04437} customizeNewLogger(childLogger);{color}}}
{{ loggerCache.put(childName, childLogger);}}
{{ incSize();}}
{{ }}}
Thanks for your consideration of this update!
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