How to know the filename used by the appender of a given logger
Within my application I would like to know the filename used by it's logger. I've asked this question before but didn't get an answer. So I will give it another try. I've browsed through the Javadoc of the classes and interfaces where I thought by their name they should be able to provide this piece of information (LoggerContext and Appender to name two of them), but wasn't lucky. Can anyone help here? Ulrich
I've made my app know the logger file name so that I can put a link to it in an email. Buy the way I did it was to make the app choose the filename and set a system property. Then in logback.xml refer to the system property. If that approach does not work, because you are using a dynamic log file name, then I suggest you try subclassing the rolling appender and getting the new filename each time one is generated, and then putting that value into a static singleton that is visible to your app. David On 31 Jul 2013, at 11:12, Ulrich <Forums@gombers.de> wrote:
Within my application I would like to know the filename used by it's logger. I've asked this question before but didn't get an answer. So I will give it another try. I've browsed through the Javadoc of the classes and interfaces where I thought by their name they should be able to provide this piece of information (LoggerContext and Appender to name two of them), but wasn't lucky.
Can anyone help here? Ulrich
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Thank you. I don't want to set the filename or maintain the appender from my program. This is up to the operators running the application. And I don't want to add limitations beyond those given by logback itself. I thought logback would know the file it uses - why not supply the name? I could also (and I do it already) set the logfile by the operationg system and provide the name as an argument. In this case the I must request that only the console-appender can be used. But I don't like this approach. Ulrich Am 31.07.2013 12:21, schrieb David Roussel:
I've made my app know the logger file name so that I can put a link to it in an email.
Buy the way I did it was to make the app choose the filename and set a system property. Then in logback.xml refer to the system property.
If that approach does not work, because you are using a dynamic log file name, then I suggest you try subclassing the rolling appender and getting the new filename each time one is generated, and then putting that value into a static singleton that is visible to your app.
David
On 31 Jul 2013, at 11:12, Ulrich <Forums@gombers.de> wrote:
Within my application I would like to know the filename used by it's logger. I've asked this question before but didn't get an answer. So I will give it another try. I've browsed through the Javadoc of the classes and interfaces where I thought by their name they should be able to provide this piece of information (LoggerContext and Appender to name two of them), but wasn't lucky.
Can anyone help here? Ulrich
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Ulrich,
I thought logback would know the file it uses - why not supply the name?
There could be no file (console) or a hundred files, so it's not possible to generalise. Try something like this: <configuration> <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>mylog.txt</file> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!-- rollover daily --> <fileNamePattern>mylog-%d{yyyy-MM-dd}.%i.txt</fileNamePattern> <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> <!-- or whenever the file size reaches 100MB --> <maxFileSize>100MB</maxFileSize> </timeBasedFileNamingAndTriggeringPolicy> </rollingPolicy> <encoder> <pattern>%msg%n</pattern> </encoder> </appender> <root level="DEBUG"> <appender-ref ref="ROLLING" /> </root> </configuration> This example is directly from http://logback.qos.ch/manual/appenders.html But instead SizeAndTimeBasedFNATP, you should subclass SizeAndTimeBasedFNATP and override the getActiveFileName() method. Then capture the filename, and put it into somewhere your app can see. There might be other ways, but I think this approach would work. David On 31 Jul 2013, at 13:41, Ulrich <Forums@gombers.de> wrote:
Thank you. I don't want to set the filename or maintain the appender from my program. This is up to the operators running the application. And I don't want to add limitations beyond those given by logback itself. I thought logback would know the file it uses - why not supply the name? I could also (and I do it already) set the logfile by the operationg system and provide the name as an argument. In this case the I must request that only the console-appender can be used. But I don't like this approach.
Ulrich
Am 31.07.2013 12:21, schrieb David Roussel:
I've made my app know the logger file name so that I can put a link to it in an email.
Buy the way I did it was to make the app choose the filename and set a system property. Then in logback.xml refer to the system property.
If that approach does not work, because you are using a dynamic log file name, then I suggest you try subclassing the rolling appender and getting the new filename each time one is generated, and then putting that value into a static singleton that is visible to your app.
David
On 31 Jul 2013, at 11:12, Ulrich <Forums@gombers.de> wrote:
Within my application I would like to know the filename used by it's logger. I've asked this question before but didn't get an answer. So I will give it another try. I've browsed through the Javadoc of the classes and interfaces where I thought by their name they should be able to provide this piece of information (LoggerContext and Appender to name two of them), but wasn't lucky.
Can anyone help here? Ulrich
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I see what you mean; one logger could use several appenders and each appender may or may not write to file. I thought to test for the file (so I was aware of this) but didn't think of the fact that the appenders introduce another layer of abstraction. So I would have to retrieve each appender to get the filename(s). And in case it was a RollingFileAppender, the interesting message might just have been rolled off. My idea was to send a mail when a special event rises and to indicate the message file for help. The person fixing the problem might not be the one maintaining the logging environment; it was meant to provide the shortcut to help problem researching. So I have either to think of another approach or just leave it as it is. Thank you for your hint: It helps me for a better understanding of the logback environent. But as I said yesterday; I don't want to limit the logging opportunities for the operators. THanks a lot, Ulrich Am 31.07.2013 16:39, schrieb David Roussel:
Ulrich,
I thought logback would know the file it uses - why not supply the name?
There could be no file (console) or a hundred files, so it's not possible to generalise.
Try something like this:
<configuration> <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>mylog.txt</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!-- rollover daily --> <fileNamePattern>mylog-%d{yyyy-MM-dd}.%i.txt</fileNamePattern> <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> <!-- or whenever the file size reaches 100MB --> <maxFileSize>100MB</maxFileSize> </timeBasedFileNamingAndTriggeringPolicy> </rollingPolicy> <encoder> <pattern>%msg%n</pattern> </encoder> </appender>
<root level="DEBUG"> <appender-ref ref="ROLLING" /> </root>
</configuration>
This example is directly from http://logback.qos.ch/manual/appenders.html
But instead SizeAndTimeBasedFNATP, you should subclass SizeAndTimeBasedFNATP and override the getActiveFileName() method. Then capture the filename, and put it into somewhere your app can see.
There might be other ways, but I think this approach would work.
David
On 31 Jul 2013, at 13:41, Ulrich <Forums@gombers.de <mailto:Forums@gombers.de>> wrote:
Thank you. I don't want to set the filename or maintain the appender from my program. This is up to the operators running the application. And I don't want to add limitations beyond those given by logback itself. I thought logback would know the file it uses - why not supply the name? I could also (and I do it already) set the logfile by the operationg system and provide the name as an argument. In this case the I must request that only the console-appender can be used. But I don't like this approach.
Ulrich
Am 31.07.2013 12:21, schrieb David Roussel:
I've made my app know the logger file name so that I can put a link to it in an email.
Buy the way I did it was to make the app choose the filename and set a system property. Then in logback.xml refer to the system property.
If that approach does not work, because you are using a dynamic log file name, then I suggest you try subclassing the rolling appender and getting the new filename each time one is generated, and then putting that value into a static singleton that is visible to your app.
David
On 31 Jul 2013, at 11:12, Ulrich <Forums@gombers.de <mailto:Forums@gombers.de>> wrote:
Within my application I would like to know the filename used by it's logger. I've asked this question before but didn't get an answer. So I will give it another try. I've browsed through the Javadoc of the classes and interfaces where I thought by their name they should be able to provide this piece of information (LoggerContext and Appender to name two of them), but wasn't lucky.
Can anyone help here? Ulrich
_______________________________________________ Logback-user mailing list Logback-user@qos.ch <mailto:Logback-user@qos.ch> http://mailman.qos.ch/mailman/listinfo/logback-user
_______________________________________________ Logback-user mailing list Logback-user@qos.ch <mailto:Logback-user@qos.ch> http://mailman.qos.ch/mailman/listinfo/logback-user
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Ulrich