Hi Matt, >From: "Matt Munz" <[EMAIL PROTECTED]> >Reply-To: [EMAIL PROTECTED] >To: <[EMAIL PROTECTED]> >Subject: RE: [JBoss-user] XMBean Persistence >Date: Sat, 17 Aug 2002 21:03:41 -0400 > >Adrian, > > Is there any code I could see / use as a starting point?
The changes David suggested sound ok. I think this was how Juha intended this to work. The changes I will be looking at (not there yet) is the part not on your radar. This should also include distributing changes throughout a cluster without having to change the deployment descriptor and re-farming the deployment. Local Persistence is still relevent for individual machine tuning. The actual persistence mechanism (PersistenceManager) is irrelevent to me. I don't really think these implementations belong in the jmx layer. Regards, Adrian > >David, > > Thank you for your suggestions. I will definately look into >implementing >the mechanism you describe. > > > Out of curiousity, what are you using xmbean persistence for? > > Generally, I'm trying to deliver a modular, reconfigurable, J2EE-based >server product that is easily maintained and configured. I'm currently not >interested in the EJB elements of J2EE, and JMX seems to be the most >valueable part of the JBoss feature set for me right now. > > Basically, I want the deployer to be able to drop in an unconfigured or >minimally configured server module and then configure it via the (JMX) >management interface. In the spirit of efficiency, I want these changes to >be permanent. That way, if the deployer needs to re-start the server, the >server configuration isn't lost. > > What makes XMBean persistence great for this is that it is sufficiently >generic to be useful in most if not all cases, without the need to write >custom persistence code for each managed object. > > At some point, it might be interesting to extend persistence to all >MBeans >on the server, allowing one to make a "snapshot" of the current >configuration. That snapshot could be reloaded at some point in the future >to return the server to its prior configuration. This isn't on my radar, >however, as, based on my experiences with standard and dynamic MBeans, I >don't expect I'll be using them. ;) > > - Matt > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED]]On Behalf Of David Jencks >Sent: Friday, August 16, 2002 9:19 PM >To: [EMAIL PROTECTED] >Subject: Re: [JBoss-user] XMBean Persistence > > >On 2002.08.16 15:47:05 -0400 Matt Munz wrote: > > David, > > > > Thanks for your reply. Could you indulge me in some additional > > information? > > > > I am fuzzy on the interceptor stack concept, and I don't see how > > persistence is currently implemented as a "stack" or "interceptor". I > > found > > the following line in org.jboss.mx.modelmbean.ModelMBeanInvoker. > > > > protected PersistenceManager persistence = new NullPersistence(); > >Hmm. probably not much persistence from that one;-) > > > > > ModelMBeanInvoker is the superclass of org.jboss.mx.modelmbean.XMBean. > > At > > deploy-time, the server parses my jboss-service.xml and creates a new > > instance of org.jboss.mx.modelmbean.XMBean, using the xmbean descriptor > > (xml) that I provide. > > > > When I set values on my XMBean, the NullPersistence (Manager) is > > called, > > which (as its name implies) does nothing. > > > > What I'm thinking of doing is writing a FileBasedPersistenceManager or > > JDBCPersistenceManager or a similar class. Then I'd create a way to > > designate this in the *-service.xml or XMBean descriptor xml. Then the > > object that instantiates the MBean can set its PersistenceManager to a > > non-null type. > > > > I got the impression that someone had already done this, or something > > equivalent. Is this true? > >Adrian is working on it as I understand. > > > > > Am I on the right track here, or is the "persistence" instance >variable > > on > > org.jboss.mx.modelmbean.ModelMBeanInvoker a "canard"? > >OK, I just looked through the code, and discovered I didn't know how this >is set up:-) here's what I now think you should do: > >1. implement your persistence stuff as a PersistenceManager. > >2. add a descriptor (and parsing for it) to the xmbean10 xml/dtd that >identifies the class of your persistence thingy. Make XMBean10 find this >and turn it into a descriptor (you can use the generic descriptor method, >but I think this should explicitly named). > >3. Modify ModelMBeanInvoker.preRegister to look for this descriptor (parsed >for you by XMBean10) and if found create an instance and install it as the >persistence for that mbean. > >If you need a lot of parameters for your PersistenceManager I'd think about >making it into an mbean and supplying the ObjectName in the descriptor. >I'd probably include a getInstance managed attribute/operation so the >actual object can be retrieved.... no need for an interceptor stack for to >the persistence manager;-) > >4. Contribute the results. I'd really like to see this working. I think >it will eventually revolutionize jboss administration, although it might >take a big change in attitude. > >Out of curiousity, what are you using xmbean persistence for? > >Thanks! > >david jencks > > > > > - Matt > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED]]On Behalf Of David Jencks > > Sent: Friday, August 16, 2002 2:55 PM > > To: [EMAIL PROTECTED] > > Subject: Re: [JBoss-user] XMBean Persistence > > > > > > everything I have done is in cvs head. I think there is a xmbean > > persistence interceptor in the interceptor stack, but I have never >looked > > at it. > > > > My latest changes in this area: > > > > --xmbean xml descriptor can include initial values for attributes. They > > are set from string representations using PropertyEditors, just like in > > ServiceConfigurator. > > > > --(not part of jbossmx, but related) You can directly include an xmbean > > xml > > descriptor in a *-service.xml file and it will be loaded as with any > > other > > mbean. > > > > Previous related work: undeploying a class that is used for an mbean > > results in the mbean being undeployed and its current attribute values > > saved in a normal -service.xml snippet. When you resupply the class, >you > > get the mbean back with these values. This almost certainly doesn't >work > > with xmbeans, just standard and dynamic mbeans. > > > > If this is insufficiently detailed let me know. > > > > thanks > > david jencks > > > > On 2002.08.16 14:30:28 -0400 Matt Munz wrote: > > > > > > (this is copied from a forum topic by the same name) > > > > > > Paul, Juha, David, Sacha, and others, > > > > > > I have been following your threads (mail and forum), and have come to > > the > > > conclusion that I am one step behind on this issue. > > > > > > I need to get minimal XMBean Persistence working ASAP and am happy to > > > write > > > the code to do so. Based on your comments, I think at least one of you > > > may > > > have already done this. > > > > > > Would it be possible for me to see the code? > > > > > > If not, any pointers on getting started with implementing this? > > > > > > - Matt > > > > > > > > > > > > ------------------------------------------------------- > > > This sf.net email is sponsored by: OSDN - Tired of that same old > > > cell phone? Get a new here for FREE! > > > https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 > > > _______________________________________________ > > > JBoss-user mailing list > > > [EMAIL PROTECTED] > > > https://lists.sourceforge.net/lists/listinfo/jboss-user > > > > > > > > > > > > ------------------------------------------------------- > > This sf.net email is sponsored by: OSDN - Tired of that same old > > cell phone? Get a new here for FREE! > > https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 > > _______________________________________________ > > JBoss-user mailing list > > [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/jboss-user > > > > > > > > ------------------------------------------------------- > > This sf.net email is sponsored by: OSDN - Tired of that same old > > cell phone? Get a new here for FREE! > > https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 > > _______________________________________________ > > JBoss-user mailing list > > [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/jboss-user > > > > > > >------------------------------------------------------- >This sf.net email is sponsored by: OSDN - Tired of that same old >cell phone? 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