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

[niels]

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>****
>
> _______________________________________________
> slf4j-user mailing list
> slf4j-user at qos.ch
> http://mailman.qos.ch/mailman/listinfo/slf4j-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qos.ch/pipermail/slf4j-user/attachments/20130524/342b4608/attachment-0001.html>