Sacha,
I follow you fine. The RW attributes you describe should be RO. Another mechanism
should be used to designate a default value. This (mis)use of the MBean interface
results in an inconsistent view of the server configuration capabilities. It may be
convenient to describe a "write-once at a very-specific time" attribute as RW, but
this is fitting a round peg in a square hole (it may fit, but it rattles around a lot
and could break as a result).
What you need is an Object-creation descriptor that says "pass these arguments to
the constructor of object X". Then the value will be set *before* the object is
loaded into the MBean server, and there is no need to name any attributes RW
spuriously.
I think that it is possible that the XMBean descriptor has something like this --
perhaps this is the best option.
The take-home message here is that MBean Persistence is a cross-cutting concern. As
such, I expect it to pull some skeletons out of the closet re: MBeans with
inconsistent interfaces.
- Matt
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Sacha
Labourey
Sent: Fri 1/24/2003 10:30 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [JBoss-dev] [ jboss-Change Notes-672538 ] Master Configuration
Service
Not exatly.
Take a look at the Naming Service MBean for example. It has a Port and
IPAddress RW attribute for example because when the MBean is started the following
occurs:
- an instance of the Naming Service class is created (new blabla())
- the attribute values found in jboss-service.xml for this mbean are assigned
to the RW attributes of the Naming Service MBean
- the service controller invokes create and then start on the MBean instance
- inside the create/start methods, the Port/IPAddress attribute values are
used to connect to the appropriate port
Once this is done, changing the Port RW attribute will have *no* effect i.e.
the naming service will not unbind/rebind with a new address/port. For this, you must
stop the service, change the values and restart it. Do you follow me?
Cheers,
sacha
-----Message d'origine-----
De : Matt Munz
[mailto:[EMAIL PROTECTED]]De la part de Matt Munz
Envoyé : vendredi, 24 janvier 2003 15:59
À : [EMAIL PROTECTED]
Objet : RE: [JBoss-dev] [ jboss-Change Notes-672538 ] Master
Configuration Service
Sacha,
I don't really understand. What good is a RW attribute if changing
it has no effect? If this is really the case, then I think a lot of those RW
attributes should be changed to RO. The whole idea of JMX is Management. The
interface means something, right?
- Matt
-----Original Message-----
From: [EMAIL PROTECTED] on behalf
of Sacha Labourey
Sent: Fri 1/24/2003 9:45 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [JBoss-dev] [ jboss-Change Notes-672538 ] Master
Configuration Service
Oh, no, nothing wrong at all. It is just that while I can
easily see an advantage to take a snapshot of a server config for future reference or
analysis, re-loading a previous seems as hazardous to me because the configuration
should really be applied when the mbeans are created, not afterwards because many
settings would then have no effects at all (such as port numbers, etc.)
Thank you. cheers,
Sacha
-----Message d'origine-----
De : Matt Munz
[mailto:[EMAIL PROTECTED]]De la part de Matt Munz
Envoyé : vendredi, 24 janvier 2003 15:35
À : [EMAIL PROTECTED]
Objet : RE: [JBoss-dev] [ jboss-Change Notes-672538 ]
Master Configuration Service
Sacha,
No. Nothing fancy going on here. Just a quick
one-off proof-of-concept deal. What it does is make text-file-based mbean persistence
available today, in a format perhaps more amenable to vi hackers.
It's pretty simple to use -- why don't you just drop
it in deploy and try it out...
Basically, it takes and loads snapshots. Simple and
useable. I suppose it could be modified to do other things...
What is wrong with the jboss-service.xml files? I'm
curious -- What are you getting at?
- Matt
-----Original Message-----
From: Sacha Labourey
[mailto:[EMAIL PROTECTED]]
Sent: Fri 1/24/2003 8:00 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [JBoss-dev] [ jboss-Change
Notes-672538 ] Master Configuration Service
Can it be used at server startup instead of
the jboss-service.xml, etc.
files? i.e. can it create all Mbeans and apply
all attributes value at
runtime or can he "only" capture an instant
snapshot of the current values?
> -----Message d'origine-----
> De :
[EMAIL PROTECTED]
>
[mailto:[EMAIL PROTECTED]]De la part de Matt
> Munz
> Envoyé : mercredi, 22 janvier 2003 19:39
> À : [EMAIL PROTECTED]
> Objet : RE: [JBoss-dev] [ jboss-Change
Notes-672538 ] Master
> Configuration Service
>
>
> BTW, I realize that the name "Master
Configuration Service" may
> be misleading. It only configures the JMX
RW attributes, and
> isn't really intended as a fundamental
architectural component,
> but rather as an optional tool and a POC for
the flexibility of JMX.
>
> - Matt
>
> -----Original Message-----
> From: Matt Munz
> Sent: Wednesday, January 22, 2003 1:14 PM
> To: [EMAIL PROTECTED]
> Subject: RE: [JBoss-dev] [ jboss-Change
Notes-672538 ] Master
> Configuration Service
>
>
> Bill,
>
> I read the forum, and I'm not sure how
this relates to MBean
> Persistence. Your examples seem to be
AOP-specific. Could you
> give an example of what the integration of
this stuff with JMX
> would be like (if that is what you intend)?
>
> - Matt
>
> -----Original Message-----
> From: Bill Burke [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, January 22, 2003 12:13 PM
> To: [EMAIL PROTECTED]
> Subject: RE: [JBoss-dev] [ jboss-Change
Notes-672538 ] Master
> Configuration Service
>
>
> I am doing some things around MetaData and
centralized configuration and
> configuration chains in AOP that I'd like to
merge with the rest of JBoss.
> Please see the topic configuration and
metadata in the AOP forum.
>
> Bill
>
> > -----Original Message-----
> > From:
[EMAIL PROTECTED]
> >
[mailto:[EMAIL PROTECTED]]On Behalf Of Matt
> > Munz
> > Sent: Wednesday, January 22, 2003 11:47 AM
> > To:
[EMAIL PROTECTED]
> > Subject: RE: [JBoss-dev] [ jboss-Change
Notes-672538 ] Master
> > Configuration Service
> >
> >
> > Dain,
> >
> > I put this together with your use cases
in mind. If possible,
> > check it out, and let me know what you
think.
> >
> > - Matt
> >
> > -----Original Message-----
> > From: SourceForge.net
[mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, January 22, 2003 11:29 AM
> > To: [EMAIL PROTECTED]
> > Subject: [JBoss-dev] [ jboss-Change
Notes-672538 ] Master Configuration
> > Service
> >
> >
> > Change Notes item #672538, was opened at
2003-01-22 11:28
> > You can respond by visiting:
> >
https://sourceforge.net/tracker/?func=detail&atid=381174&aid=67253
> > 8&group_id=22866
> >
> > Category: None
> > Group: None
> > Status: Open
> > Priority: 5
> > Submitted By: Matthew Munz (mattmunz)
> > Assigned to: Nobody/Anonymous (nobody)
> > Summary: Master Configuration Service
> >
> > Initial Comment:
> > A Service which writes and reads all of
the JMX RW
> > attributes to a single file in the Java
Properties Format.
> >
> > I figured that this would be a good step
on the road to an
> > XML MBean Persistence engine. This
service operates
> > externally to the MBeans it persists. It
is not really in
> > line with the JMX spec, so it doesn't
provide MBean
> > Persistence in the way implied by the
spec.
> > Nonetheless, a "snapshot" of the server
can be written
> > and loaded quite easily.
> >
> > The details can be found in the
documentation located
> > under
$jboss-head/varia/src/reources/master-
> > config.sar/documentation .
> >
> > There are a few little details that should
probably be
> > ironed out, but for those that need MBean
persistence
> > today, this is a viable solution.
> >
> > The main audience for this tool is the
system admin that
> > does not use or prefer gui / html
configuration tools. The
> > use of the Properties file format is
intentional, as it
> > provides a more compact and readible
interface when
> > compared with the XML format.
> >
> > I'm not sure about the location of this
code in the source
> > tree, so I just put it in varia for now.
I'd appreciate any
> > ideas on a better place for it.
> >
> > - Matt Munz
> >
> >
> >
> >
> >
----------------------------------------------------------------------
> >
> > You can respond by visiting:
> >
https://sourceforge.net/tracker/?func=detail&atid=381174&aid=67253
> 8&group_id=22866
>
>
>
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