Thank you for the reply.
When you say "sharing the configuration
file by all instances", do you mean having both servers point to the
same logback.xml config file? If this is what you meant, I'm not exactly
sure how I could use this to my advantage, perhaps you could elaborate
more on this suggestion.
My ultimate goal is to give the end
user of my web application (with an admin role) the ability to change the
logging level of any logger at runtime (and have this change applied to
both servers in my cluster).
Is it possible, in java code, to modify
the logging level of a logger, and then save the modifications back to
the original logback.xml configuration file? If this is possible, then
I can see how your suggestion could help me...
1.
End user submits request for change in logging level on some logger (which
is received by server 1)
2.
Application code uses Logback API to make the desired changes at runtime
3.
Application code uses Logback API to save the current runtiime configuration
back to logback.xml (still on server 1)
4.
Server 2 is also looking at the same logback.xml file (with auto-scan enabled).
Once the file is updated, the auto-scan will trigger on server 2, and the
logging level changes will then be applied to server 2 as well.
Before I go too far with the above approach,
I just have a follow-up question to using JMX. Here is the code snippet
that I am using to get the mbean proxy instance:
mbean = javax.management.JMX.newMBeanProxy(mbs, objectName,
JMXConfiguratorMBean.class, true);
The last parameter is set to "true", which
is supposed to enable broadcasting of the message (to other Mbeans on the
MbeanServer I assume) if the Mbean happens to implement NotificationBroadcaster.
Based upon some reading on other forums, I think this is how JMX can be
used to propagate the message to all servers in the cluster.
Here is the excerpt from the Javadoc:
This method behaves the same as newMBeanProxy(MBeanServerConnection,
ObjectName, Class), but additionally, if notificationBroadcaster
is true, then the MBean
is assumed to be a NotificationBroadcaster
or NotificationEmitter
and the returned proxy will implement NotificationEmitter
as well as interfaceClass.
A call to NotificationBroadcaster.addNotificationListener(javax.management.NotificationListener,
javax.management.NotificationFilter, java.lang.Object)
on the proxy will result in a call to MBeanServerConnection.addNotificationListener(ObjectName,
NotificationListener, NotificationFilter, Object),
and likewise for the other methods of NotificationBroadcaster
and NotificationEmitter.
Type Parameters:
T - allows the compiler to
know that if the interfaceClass
parameter is MyMBean.class,
for example, then the return type is MyMBean.
Parameters:
connection - the MBean server
to forward to.
objectName - the name of
the MBean within connection
to forward to.
interfaceClass - the management
interface that the MBean exports, which will also be implemented by the
returned proxy.
notificationBroadcaster -
make the returned proxy implement NotificationEmitter
by forwarding its methods via connection.
Returns:
the new proxy instance.
Does the Logback JMX Mbean implement
NotificationEmitter or NotificationBroadcaster? If not, do you think that
if it did implement one of these interfaces, that my issue would be resolved?
Thanks,
-Chris
From:
ceki <ceki@qos.ch>
To:
logback users list
<logback-user@qos.ch>
Date:
05/30/2012 03:39 PM
Subject:
Re: [logback-user]
JMX on a WebSphere clustered environment
Sent by:
logback-user-bounces@qos.ch
Chris,
Would sharing the configuration file by all instances be a possibility?
If yes, you could probably get by with the auto-scan feature.
--
Ceki
http://twitter.com/#!/ceki
On 30.05.2012 20:50, Christopher.White@bbh.com wrote:
>
>
> Hi,
>
> I'm trying to use Logback JMX in my application to allow me to change
> the configuration at runtime.
>
> I've created client code that can retrieve the JMX bean, and am able
to
> invoke the JMX bean to get/set logging levels.
>
> This works just fine on one single server. However, my application
is
> deployed on a cluster of two servers. When invoking the JMXConfigurator,
> it only modifies the logging configuration on the particular server
that
> I happened to connect to for that http request, but does not modify
the
> configuration on the other clustered server.
>
> Am I missing something, or is there no way to have one JMX call update
> the logback configuration on all clustered servers? Am I perhaps
> retrieving the JMX bean incorrectly for a clustered environment? Any
> help would be greatly appreciated.
>
>
>
> Here is the client code I am using to access the JMX bean:
>
> String contextName = "myContextName";
> String objectNameStr =
> ch.qos.logback.classic.jmx.MBeanUtil.getObjectNameFor(contextName,
> JMXConfigurator.class);
> javax.management.ObjectName objectName = new
> javax.management.ObjectName(objectNameStr);
> javax.management.MBeanServer mbs =
> java.lang.management.ManagementFactory.getPlatformMBeanServer();
> mbean = javax.management.JMX.newMBeanProxy(mbs, objectName,
> JMXConfiguratorMBean.class, true);
> mbean.setLoggerLevel("myLogger", "debug");
>
>
>
>
> Thanks,
> -Chris
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