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https://issues.apache.org/jira/browse/LOG4J2-541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939273#comment-13939273
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James Pretorius commented on LOG4J2-541:
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{quote}I do not understand why you would use a lookup on both the key and the
level. The idea of this filter is that a given value has a specific
level.{quote}
I was trying to demonstrate setting the log level at runtime using a
substituted lookup in the config file. I had a good look around and using a
DynamicThresholdFilter seemed to be the only out the box option that would
allow for this as it allows for a default threshold and it allows for the
threshold to be changed based on a runtime input value***. The only limitation
was that the lookup was restricted to a ThreadContextMap.
So, in summary passing the level as the key was purely to work in accordance
with the filter functionality because from what I could tell no other out of
the box option allowed for the functionality above.
***Possibly this is the issue here, is there a better/recommended way of
setting the log level at runtime using a substitued lookup?
> Allow all lookup types in DynamicThresholdFilter
> ------------------------------------------------
>
> Key: LOG4J2-541
> URL: https://issues.apache.org/jira/browse/LOG4J2-541
> Project: Log4j 2
> Issue Type: Improvement
> Components: Filters
> Affects Versions: 2.0-rc1
> Environment: Windows 7
> Java 6
> Reporter: James Pretorius
> Labels: features
>
> Currently the DynamicThresholdFilter only supports key values pairs in the
> ThreadContextMap. It would be good to see this expanded to include all log4j2
> lookups.
> In the below example the threshold level would be stored in a map value
> substituted at runtime.
> {code:javascript|title=log4j2.json snippet}
> "root":{
> "AppenderRef":{
> "ref":"Console Appender",
> "DynamicThresholdFilter":{
> "defaultThreshold":"debug",
> "key":"$${map:log.console.level}",
> "onMatch":"ACCEPT",
> "onMisMatch":"DENY",
> "keyValuePair":[
> {
> "key":"off",
> "value":"off"
> },
> {
> "key":"fatal",
> "value":"fatal"
> },
> {
> "key":"error",
> "value":"error"
> },
> {
> "key":"warn",
> "value":"warn"
> },
> {
> "key":"info",
> "value":"info"
> },
> {
> "key":"debug",
> "value":"debug"
> },
> {
> "key":"trace",
> "value":"trace"
> }
> ]
> }
> }
> }
> {code}
> Alternatively, allow the threshold filter to be substituted with a runtime
> lookup value.
> {code:javascript|title=log4j2.json snippet}
> "root":{
> "AppenderRef":{
> "ref":"Console Appender",
> "ThresholdFilter":{
> "level":"$${map:log.console.level}",
> "onMatch":"ACCEPT",
> "onMisMatch":"DENY"
> }
> }
> }
> {code}
> The above will allow the developer to customise the log level at runtime
> across various loggers, appenders etc.
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