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From Bender Heri <hben...@ergonomics.ch>
Subject RE: [SCL-3] using of system properties in subject of SMTPAppender
Date Tue, 24 May 2011 11:17:41 GMT
Usually a customer  is served within one separate thread, isn't it? If yes, you can use the
MDC (mapped diagnostic context). You put a value into it: MDC.put("CUSTOMER", "SOME NAME")
at the begin of the session (probably in a servlet listener) and reference this value with
the layout pattern %X{CUSTOMER}. 
Do not forget to remove the value when session terminates!
Heri

> -----Original Message-----
> From: Zbynek Vavros [mailto:Zbynek_Vavros@cz.ibm.com] 
> Sent: Monday, May 23, 2011 4:18 PM
> To: log4j-user@logging.apache.org
> Subject: [SCL-3] using of system properties in subject of SMTPAppender
> 
> 
> 
> Hi,
> 
> I have a 1 server app and many clients app on different servers.
> Obviously I wanted to know from which server the email comes, 
> so I used
> this:
> 
> log4j.xml
> <appender name="email" class="org.apache.log4j.net.SMTPAppender">
>       <param name="BufferSize" value="512" />
>       <param name="SMTPHost" value="my_smtp_host" />
>       <param name="From" value="AutoBot" />
>       <param name="To" value="my_email@someserver.com" />
>       <param name="Subject" value="Agent on [${HOSTNAME}] has 
> encountered error" />
>       <layout class="org.apache.log4j.PatternLayout">
>             <param name="ConversionPattern" 
> value="%d{HH:mm:ss} [%t] %p %C
> (%L) %x - %m%n" />
>       </layout>
>       <filter class="org.apache.log4j.varia.LevelRangeFilter">
>             <param name="LevelMin" value="error" />
>             <param name="LevelMax" value="fatal" />
>       </filter>
> </appender>
> 
> and since system property has to be setup before configuring 
> log4j, I use this in my code.
> 
> Main class
> //create system property to hold server name 
> System.setProperty("HOSTNAME", InetAddress.getLocalHost 
> ().getCanonicalHostName());
> 
> //reconfigure log4j so it picks up HOSTNAME property 
> DOMConfigurator.configure(getClass().getClassLoader().getResource(
> "log4j.xml"));
> 
> Then Im receiving emails with subject like this: "Agent on 
> [127.0.0.1] has encountered error".
> So far so good.
> And now I have request to include customer name in subject.
> I have no problem to include it in stack trace, but since I 
> cannot set customer name the same way as I did with IP (there 
> are multiple customers handled by my app so I cannot just use 
> System.setProperty("CUSTOMER", "SOME NAME")).
> 
> I though of solution to set this property when exception is 
> catched and reconfigure log4j after setting proper customer 
> name into system property.
> But I think it is politelly said "ugly".
> 
> Can some1 suggest a better way maybe?
> 
> Thanks, Zbynek
> 
> 
>                                                               
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>  Zbynek VAVROS                                                
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