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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3424) Add an MBean that an application can register to change the state of Derby's JMX management
Date Mon, 25 Feb 2008 02:16:52 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572001#action_12572001
] 

Daniel John Debrunner commented on DERBY-3424:
----------------------------------------------

Two reasons for Version not being in mbeans:

 1) For MBeans registered by Derby we are only exposing the interface to applications, ie.
interface classes in o.a.d.mbeans ending in MBean.
  The implementation class remains hidden.

 2) It would require ProductVersionHolder to be referenced from mbeans, which is not part
of the public api.

> Add an MBean that an application can register to change the state of Derby's JMX management
> -------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3424
>                 URL: https://issues.apache.org/jira/browse/DERBY-3424
>             Project: Derby
>          Issue Type: New Feature
>          Components: JMX
>            Reporter: Daniel John Debrunner
>            Assignee: Daniel John Debrunner
>            Priority: Minor
>
> JMX in Derby was originally proposed as a mechanism to configure Derby replacing or enhancing
the system properties which tend to be static in nature. Thus it is somewhat ironic that jmx
is enabled with a static system property derby.system.jmx.
> I propose to add a public mbean that allows the state Derby's JMX management to be changed.
This bean is not automatically registered by Derby if derby.system.jmx is false, but instead
can be registered by an application. I believe this could occur at any time so that JMX could
be enabled on a running application, possibly by a remote client.
> This standard Mbean (o.a.d.mbeans.Management & ManagementMBean) would have these
operations & attribute:
>     public boolean isManagementActive();
>     public void startManagement(); 
>     public void stopManagement();
> If Derby is not booted within the jvm then the operations would be no-ops.
> If derby.system.jmx is true then Derby will itself register an mbean that implements
ManagementMBean to allow dynamic control of the visibility of Derby's mbeans.

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