Sunday, November 1, 2009

DZ3: JMX Instrumentation and Control

If you update the DZ runner shell script to its current form (just add to Java command line), you can use JConsole to monitor and control DZ3. This is what it looks like (click to enlarge):


And this is how to make it happen (see previous examples for context):

<!-- JMX configuration -->
<bean id="jmx-wrapper" class="net.sf.jukebox.jmx.JmxWrapper">
<constructor-arg index="0" type="java.util.Set">
<ref bean="temperature_sensor-6EE055000000"/>
<ref bean="temperature_sensor-cpu1"/>
<ref bean="temperature_sensor-cpu2"/>
<ref bean="temperature_sensor-mobo"/>
<ref bean="temperature_sensor-sda"/>
<ref bean="temperature_sensor-sdb"/>

<ref bean="rrdlogger_sensors"/>
<ref bean="rrdlogger_thermostats"/>
<ref bean="rrdlogger_dampers"/>

Not all entities are JMX enabled at this time. Adding one to the configuration won't do any harm, but you'll get a warning message in the log.

It's worth mentioning that you need to add DZ3 classes to JConsole's classpath in order to get complex entities like DataSample<Double> rendered by JConsole, like this:
${JAVA_HOME}/bin/jconsole \
where CLASSPATH is the same that is used in DZ3 Runner.

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