On 29/04/2010 10:43 AM, Ralph Goers wrote:
> Sorry, I've never used the SiftingAppender. Just read the doc for it.
> Yes, they are similar and it is a better approach. Although the doc
> mentions using it for static loggers it occurs to me that it is
> probably also useful if all the web apps are configured to use the
> same config file even if all the jars are in the web app.
If all the jars are in the same web-app (shared jars), then you don't
need ContextJNDISelector nor SiftingAppender for secondary
separation. If you wish to share the same logback.xml file for all
web-apps, I'd use a prperty to set the context name.
For example,
<configuration>
<contextName>${CONTEXT_NAME}</contextName>
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>${CONTEXT_NAME}.log</file>
<encoder>
<pattern>%d [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
</configuration>
The question is then how do you set the CONTEXT_NAME property. You
could do so before invoking joran configurator, typically in a
ServletContextListener. Here is sample code:
public class MyServletContextListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent sce) {
LoggerContext lc =
(LoggerContext) LoggerFactory.getILoggerFactory();
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
// undo default configuration
lc.reset();
lc.putProperty("CONTEXT_NAME", the_name_of_this_context);
configurator.doConfigure(args[0]);
}
}
If you only want to rely on automatic configuration, then defining
properties on the fly could be adequate [1].
Your config file becomes:
<configuration>
<define name="CONTEXT_NAME"
class="class.implementing.PropertyDefiner.ReturningAContextName">
<contextName>${CONTEXT_NAME}</contextName>
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>${CONTEXT_NAME}.log</file>
<encoder>
<pattern>%d [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
</configuration>
The "class.implementing.PropertyDefiner.ReturningAContextName" would
need to figure out the name of the enclosing web-app via an adhoc
mechanism, e.g. via a resource look up containing the name of the
web-app.
--
Ceki
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