[slf4j-user] How to prefix log messages for individual Loggers?

[niels]

You can write your own log4j layout.


2013/5/25 Alexander Poulikakos <alexander.poulikakos at ericsson.com>

>  Hi****
>
> ** **
>
> With category-name do you mean the name of the logger? Something like this?
> ****
>
> *public* *class* MyClass {****
>
>        *private* Logger logger;****
>
>        *public* MyClass(String id) {****
>
>               logger = LoggerFactory.*getLogger*(MyClass.*class*.getName()
> + "." + id);****
>
>        }****
>
> }****
>
> Then I can add something like this in my log4j.properties (or similar in
> logback.xml)
> log4j.appender.A1.layout.ConversionPattern=%c*{1}* %m %n****
>
> Which works well for the logger in MyClass, but the problem now is that
> every other Loggers in my system (which are out of my control i.e. 3PP
> libraries) will also be prefixed with something irrelevant. Anyway to avoid
> that?****
>
> ** **
>
> /Alex****
>
> ** **
>
> ** **
>
> *From:* slf4j-user [mailto:slf4j-user-bounces at qos.ch] *On Behalf Of *niels
> *Sent:* den 24 maj 2013 22:04
>
> *To:* User list for the slf4j project
> *Subject:* Re: [slf4j-user] How to prefix log messages for individual
> Loggers?****
>
> ** **
>
> Well the simplest way is to put the prefix in the category-name and make
> the Logger as an instance-variable. The other solution, was to write an
> extension which provides special methods. ****
>
> ** **
>
> 2013/5/24 Alexander Poulikakos <alexander.poulikakos at ericsson.com>****
>
> Thanks for response J****
>
>  ****
>
> They sometimes run in separate threads and sometimes in same thread. With
> “own” logger you mean each instance should have its own unique logger? If
> an own logger is used, how to prefix in best way?****
>
>  ****
>
> /Alex****
>
>  ****
>
> *From:* slf4j-user [mailto:slf4j-user-bounces at qos.ch] *On Behalf Of *niels
> *Sent:* den 24 maj 2013 11:53
> *To:* User list for the slf4j project
> *Subject:* Re: [slf4j-user] How to prefix log messages for individual
> Loggers?****
>
>  ****
>
> If your nodes run in different threads you can use MDC. It is a
> ThreadLocal. Otherwise you need an own logger.****
>
> Niels****
>
>  ****
>
> 2013/5/23 Alexander Poulikakos <alexander.poulikakos at ericsson.com>****
>
> Hi slf4j users****
>
>  ****
>
> I have a class that communicates (i.e. sending commands) with remote
> nodes. I can create multiple instances of this class, where each instance
> communicates with a specific host. I use a Logger object to log each
> command. My problem is that the command does not show which node it is sent
> to. What would be the best way to prefix the log message with an id that
> identifies which node is the receiver of a command? I’m trying to avoid
> “manually” prefixing the log message for each logger call.****
>
>  ****
>
> The below example is a simplified version. In reality there are plenty
> logger calls, many different types of nodes, different types of
> communication. Etc.****
>
>  ****
>
> I have tried using the MDC, but effectively, due to its static context,  I
> need to surround each logger call with,:****
>
>               MDC.*put*("id", id);****
>
>               logger.info(command);****
>
>               MDC.*remove*("id");****
>
> Which is not much different from prefixing each log message****
>
>               logger.info(id + “:” + command);****
>
>  ****
>
> Any suggestions how to solve this?****
>
>  ****
>
> Regards,****
>
> Alex****
>
>  ****
>
> ===========================================****
>
> *package* demo;****
>
> *public* *class* Demo {****
>
>        *public* *static* *void* main(String[] args) {****
>
>               Node n1 = *new* Node("host.com", "id1");****
>
>               n1.send("command1");****
>
>               ****
>
>               Node n2 = *new* Node("anotherhost.com", "id2");****
>
>               n2.send("command2");****
>
>        }****
>
> }****
>
> ===========================================****
>
> *package* demo;****
>
> *import* org.slf4j.Logger;****
>
> *import* org.slf4j.LoggerFactory;****
>
> *public* *class* Node {****
>
>        *private* Logger logger = LoggerFactory.*getLogger*(Node.*class*);*
> ***
>
>        *private* String *id*;****
>
>  ****
>
>        *public* Node(String host, String id) {****
>
>               *this*.id = id;****
>
>               // create connection to host****
>
>        }****
>
>        ****
>
>        *public* *void* send(String command){****
>
>               logger.info(command);****
>
>               //send command to host****
>
>        }****
>
> }****
>
> ===========================================****
>
>
> Using the following logback.xml****
>
> ========================================****
>
> <configuration>****
>
>   <appender name=*"STDOUT"* class=*"ch.qos.logback.core.ConsoleAppender"*>
> ****
>
>     <encoder>****
>
>       <pattern>%d{HH:mm:ss.SSS} %X{id} %*msg*%n</pattern>****
>
>     </encoder>****
>
>   </appender>****
>
>  ****
>
>   <root level=*"INFO"*>****
>
>     <appender-ref ref=*"STDOUT"* />****
>
>   </root>****
>
> </configuration>****
>
>
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>
>  ****
>
>
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>
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