[jboss-jira] [JBoss JIRA] Resolved: (JBMESSAGING-1247) Remove requirement for JMX to use JGroups

[Jeff Mesnil (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBMESSAGING-1247?page=all ]

Jeff Mesnil resolved JBMESSAGING-1247.
--------------------------------------

    Resolution: Won't Fix

Removing requirements for JMX is possible using AS 5 by injecting the ChannelFactory bean
into JBM -service.xml:

<attribute name="ChannelFactory"><inject bean="JChannelFactory"/></attribute>

However this syntax is available only for AS 5 and we must remain compatible EAP 4.3.

We will keep the code as is and be very careful to never reference directly JChannelFactoryMBean which will be removed in next JGroups release.

> Remove requirement for JMX to use JGroups
> -----------------------------------------
>
>                 Key: JBMESSAGING-1247
>                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-1247
>             Project: JBoss Messaging
>          Issue Type: Task
>    Affects Versions: 1.4.1.beta1
>            Reporter: Brian Stansberry
>         Assigned To: Jeff Mesnil
>            Priority: Minor
>             Fix For: 1.4.1.beta2
>
>
> The current JGroups integration uses JMX to get ahold of a Channel:
> public Channel createControlChannel() throws Exception
> {
>    return (Channel) server.invoke(this.channelFactory, MUX_OPERATION,
>       new Object[]{controlStack, uniqueID + "-CTRL", Boolean.TRUE, uniqueID}, MUX_SIGNATURE);
> }
> The channelFactory member is an ObjectName injected into MessagingPostOfficeService. Better is to expose a property of type org.jgroups.ChannelFactory and inject an instance of that. That's the POJI interface for an object that provides JGroups channels.
> Background:
> JGroups intends to remove the legacy org.jgroups.jmx.JChannelFactoryMBean interface that is being invoked in the above code.  That code is reflection based, so as long as a service that exposes the MUX_OPERATION signature is registered in JMX, the call will still work.  AS 5 will ensure that such a service is registered, without using the org.jgroups.jmx.JChannelFactoryMBean itself. So, the above JMX-based code will work, and this isn't an urgent issue.  But, this usage does tie JBM clustering to JMX, rather than allowing simple MC integration or even manual instantiation.

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