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From "Rick Curtis (JIRA)" <>
Subject [jira] Commented: (OPENJPA-1844) Create a JConsole plugin to display DataCache statistics and help tune the cache
Date Fri, 29 Oct 2010 15:51:23 GMT


Rick Curtis commented on OPENJPA-1844:

With revision 1028808 I committed all of the changes for the JConsole plugin to openjpa-tools...
but I messed up the commit message. See OPENJPA-1801 for the commit. I took a 180 from my
original commit as I removed the dependency on ANY runtime code and now it can run in a true
standalone fashion.

[java_home]\bin>jconsole.exe -pluginpath openjpa-tools-0.1.0-SNAPSHOT.jar

A few things to note:
 * This plugin is now completely independent from the OpenJPA runtime code. I had to make
use of java.util.ResourceBundle and java.text.MessageFormat for localization of strings.
 * To launch the plugin you no longer need to specify the classpath.
 * I added org.apache.openjpa.jconsole.DataCacheMBean interface which includes a subset of
the runtimes MBean interface(org.apache.openjpa.instrumentation.jmx.DataCacheJMXInstrumentMBean).
I did this as a convenience so I could use JMX.newMBeanProxy(...), rather than using the 'reflection'
way of invoking MBean methods.

> Create a JConsole plugin to display DataCache statistics and help tune the cache
> --------------------------------------------------------------------------------
>                 Key: OPENJPA-1844
>                 URL:
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: datacache, instrumentation
>            Reporter: Rick Curtis
>            Assignee: Rick Curtis
>             Fix For: 2.1.0
>         Attachments: screenshot.jpg
> I have created a simple JConsole plugin that will enable a OpenJPA user to view DataCache
statistics and it also allows for some runtime interactions with the cache. These changes
are going to come in two parts. The first part will be the plugin side of changes and second
part is going to come via another JIRA which will feature the OpenJPA core runtime changes.
> The features that I have currently implemented are:
>  - A view of cache hits, reads, and writes.
>  - A button to evict the entire contents of the cache.
>  - A button to reset the statistics.
>  - A check box to enable / disable statistics gathering
>  - The ability to disable / enable caching specific types.
> I would like to add the following features:
>  - Show the current DataCache configuration and show what (if any) changes have been
made at runtime (ie: Stopped caching a certain type).
>  - Allow changing the cache size.
>  - Evict only a certain type.
>  - Make some cute bar charts for hit/miss ratio.
> This works both in a JSE environment and in a WebSphere environment(sans security). I'll
add more details on how to run jconsole with the plugin once I have some code committed.

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