[jbosscache-dev] Re: [jboss-cluster-dev] Accessing Cache instances from AS5

[Galder Zamarreno]

Brian,

Thanks very much for providing such detailed information and the revised 
version of the AS Clustering Guide. I'll make sure I have a read to the 
entire guide asap since it contains very important information that I 
was not aware of.

Also, this makes me think that the whole 5.2 and 5.3 sections in the JBC 
docu (http://is.gd/13oVC) should go away or simply refer/link to AS 
Clustering Guide, since AS Clustering knows how to do this best and the 
JBC docu, unless kept tightly in check, will always be outdated. Thoughts?

Cheers,

Brian Stansberry wrote:
> Galder Zamarreno wrote:
>> Hi,
>>
>> Having looked at this forum post thread 
>> (http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4235313#4235313), 
>> I wanted to check, specially with Brian, what's the preferred method 
>> in AS5 to get access to a local cache.
>>
> 
> Couple methods, discussed in more detail at http://tinyurl.com/lq688t 
> section 11.2
> 
> 1) Use the CacheManager to create your cache; the CacheManager is 
> available in JNDI at java:/CacheManager. See Section 11.2.1.
> 
> 2) Use CacheJmxWrapperMBean and it's "cache" mbean attribute. Simplest 
> way is to deploy it via a -service.xml. Section 5.4.2 of JBC 3.1 docs at 
> http://tinyurl.com/m49qen has other methods.
> 
>> First of all, anything bound to JNDI needs to be Serializable. 
>> http://www.jboss.org/community/wiki/JMXMBeanRemoteProxy wiki explains 
>> how to bind a proxy to an MBean into JNDI and retrieve it remotely. 
>> Don't think this is what the user wants though. It looks as if he only 
>> wants to access it from diff apps.
>>
> 
> Remoting proxies to pojos can also be created. JBAS-4456. See forum 
> discussion at http://tinyurl.com/n3zbgr and a test case example 
> deployment config at http://tinyurl.com/lyta4y. But, as discussed on 
> that forum thread, the JNDI-registration part got separated out into a 
> separate concern, meant to be handled via the @JndiBinding annotation. 
> Sometime after that discussion, support for @JndiBinding got removed 
> from the default/all configs.  It can be added back by including
> 
> 
>    <lifecycle-configure xmlns="urn:jboss:aop-beans:1.0"
>       name="JndiBindingAdvice"
> 
> class="org.jboss.aop.microcontainer.aspects.jndi.JndiLifecycleCallback"
>       classes="@org.jboss.aop.microcontainer.aspects.jndi.JndiBinding"
>       manager-bean="AspectManager"
>       manager-property="aspectManager"/>
> 
> in a -jboss-beans.xml, but, well, that whole process is just too much to 
> advise as some sort of standard way of accessing JBC. Particularly since 
> a remote proxy to org.jboss.cache.Cache isn't really valid; it doesn't 
> cover the Node interface.
> 
>> Traditionally, there was always the JMX method to retrieve a local 
>> Cache instance (see http://is.gd/WOmk) but this section has 
>> dissapeared from the latest JBC 3.1 documentation in http://is.gd/WOsH.
>>
>> I know that CacheJmxWrapperMBean and CacheJmxWrapper have been 
>> deprecated and instead org.jboss.cache.jmx.JmxRegistrationManager is 
>> now in place but it's unclear from the code what's the alternative. 
>> One that I can think of is MC bean injection but that assumes your app 
>> is build around MC beans which could or not happen.
>>
>> Finally, one thing to note to everyone, if you simply name your MC 
>> bean with -beans.xml, it won't deploy it!! Thanks to Emanuel who 
>> helped me figure out why a cache instance wouldn't deploy. Instead, it 
>> should be named -jboss-beans.xml. I'll create a JIRA to fix this.
>>
> 
> Thanks for fixing that!
> 
>> Cheers,
> 
> 

-- 
Galder Zamarreño
Sr. Software Maintenance Engineer
JBoss, a division of Red Hat