Hi Davide,
I'm afraid that I don't quite understand what you're trying to achieve -
you might have to spell it out :-(
One thing I forgot to add, if you look in the source tree in
qpid/specs/management-schema.xml that will tell you all of the
properties available for all of the broker management objects.
The connection logger program that I pointed you at just might be able
to give you some pointers, what that does is to list information about
all connections, but it's quite a bit more tricksy than that. I was
interested in identifying whether connections were producers or
consumers. That's actually quite hard....
What I did was to get the connection, session and subscription objects
and for each connection work out how many sessions and for each session
work out how many subscriptions - it's hard because sessions are
associated with connections not the other way around and subscriptions
are associated with sessions. It's logical because of the multiplicity,
if it the associations were done the *convenient* way there would be a
1..* multiplicity but the way it has been implemented in QMF it's a 1..1
multiplicity.
Anyway as my connections know the associated subscriptions I can find
the queue reference and from that find bindings - the "-q" option in my
program displays the queues, bindings and exchanges associated with a
connection kind of like a fancy qpid-config -b queues.
At a guess by "log connections of components owning to a certain
"family" " you might be meaning log connections associated with a
specific subset of bindings - if so you should be able to cannibalise my
connection logger quite easily to do this.
Hope this makes sense and points you in the right direction.
Best regards,
Frase
On 16/03/12 17:58, Davide Anastasia wrote:
Hi Fraser,
Thanks for your quick reply!
My primary language is C++ and I use the messaging API and QMF2. However
I am not scared to prototype something in Python.
What I am trying to do is to log connections of components owning to a
certain "family", let's say all the components that can serve a certain
type of request, so that a central "hub" knows how many potential
consumers are available at every time. I thought it was the perfect
scenario for a customized heartbeat, but I guess I can achieve the same
result with the QMF, getting notification on connect and disconnect
events.
Am I going in the right direction? Does this make sense to you?
Best,
Davide
-----Original Message-----
From: Fraser Adams [mailto:[email protected]]
Sent: 16 March 2012 16:49
To: [email protected]
Subject: Re: QMF Tutorial
Hi Davide
What language are you interested in?
I'm afraid QMF is still a bit disjoint you might be aware that there are
two variants:
QMF1 which uses a compact binary protocol and the QMF1 API - that's what
the bundled qpid tools such as qpid-config, qpid-stat etc. use. That has
good python support, I *think* the C++ API works but the Java
implementation is very broken
QMF2 uses a protocol based on Map messages, that is *relatively* easy to
drive just by using Map messages because it's primarily in the form of
key/value pairs. The QMF2 API has a specification hanging off the qpid
wiki QMF pages There's I believe a prototype python implementation and
I've written a Java implementation that covers the full API there's also
a C++ API for QMF2 but unfortunately that bears no relation whatsoever
to the API specified off the wiki???
As I say it's rather disjoint :-(
The main QMF page is here:
https://cwiki.apache.org/qpid/qpid-management-framework.html
A tutorial for the QMF1 python stuff is here:
https://cwiki.apache.org/qpid/qmf-python-console-tutorial.html
I recently wrote a connection logger application using this old API it's
linked to this Jira and might give you some ideas
https://issues.apache.org/jira/browse/QPID-3869
The QMF2 documentation lives off here:
https://cwiki.apache.org/qpid/qmfv2-project-page.html
The Java QMF2 stuff I did is linked off this Jira
https://issues.apache.org/jira/browse/QPID-3675
HTH
Frase
On 16/03/12 16:15, Davide Anastasia wrote:
Hi All,
Can anybody suggest a good tutorial on QMF?
Best,
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