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Re: [xmlblaster-devel] Get connection states of connected nodes...
Marcel,
Thanks! I will play with it! It looks like it will work. We do not yet run
under Java 5, so I guess I will need to move there to support the JMX
stuff...
Matt
----- Original Message -----
From: "Marcel Ruff" <mr at marcelruff.info>
To: <xmlblaster-devel at server.xmlBlaster.org>
Sent: Sunday, March 12, 2006 8:42 PM
Subject: Re: [xmlblaster-devel] Get connection states of connected nodes...
> Salute,
>
> in the current SVN there it is now possible to invoke JMX commands from
> the server command line:
>
> java -Dcom.sun.management.jmxremote org.xmlBlaster.Main
> ..
> j <JMX call> For example 'j
> org.xmlBlaster:nodeClass=node,node="heron"/action=getFreeMemStr'
>
> if you wish you can play interactively with this feature.
> If the JMX possibilities are enough for you, we could add this
> to be available with command messages (over your SSL connection) as well.
>
> Your query is something like:
>
> j
>
org.xmlBlaster:nodeClass=node,node="frodo",clientClass=client,client="sam",s
essionClass=session,session="1"/action=getConnectionState
>
> and returned is "ALIVE" or "POLLING" depending on sam's availability,
>
> Marcel
>
> Matthew Sargent wrote:
> > Marcel,
> >
> > ----- Original Message -----
> > From: "Marcel Ruff" <mr at marcelruff.info>
> > To: <xmlblaster-devel at server.xmlBlaster.org>
> > Sent: Sunday, March 12, 2006 9:48 AM
> > Subject: Re: [xmlblaster-devel] Get connection states of connected
nodes...
> >
> >
> >
> >> Matthew Sargent wrote:
> >>
> >>> I can see lots of info about the admin messages and such, but is it
> >>>
> > possible for me to access these from my connected client
programattically? I
> > would like to report to the user of my client the status of the remote
node.
> > My client connects to the local xmlBlaster via an SSL connection, the
telnet
> > port to the remote machine is not open. The only connection between my
local
> > xmlBlaster and the remote one is via the SSL as well (for security
purposes)
> >
> >> Hmm, i'm not sure i understand you here.
> >> The "__cmd:" messages can't currently access everything what JMX can
(as
> >> seen in jconsole).
> >> Probably adding a "__jmx:" prefix to do a JMX query over a
> >> xmlBlaster-message could resolve
> >> this.
> >>
> >
> > That indeed might work, essentially, I am trying to report to the user
of my
> > client application if the node containing the messages they seek to
receive
> > is still up and running.
> >
> > Say I have a two nodes, one named frodo and one named sam. Frodo and sam
are
> > connected in a cluster where sam is the master of a domain named
'garden'.
> > My client connects to frodo and want to receive 'garden' messages. The
> > client is happily running and receiving garden messages. Then the
messages
> > stop. Is it because there are none beign sent anymore or is it because
frodo
> > is no longer connected to sam? I want my client to be able to go out and
> > periodically check if frodo is connected to sam. In the future, I would
like
> > to be able to test if in my cluster, is the master of 'garden'
reachable?
> > Right now, though knowing that frodo is connected to sam would be
enough.
> >
> > I can see that using JMX i can go out and look and see, but I would like
my
> > client to be able to report it and be able to use the SSL connections I
have
> > already setup and made secure...
> >
> > Thanks again!
> >
> >
> >> Is it this you are after?
> >>
> >> regards
> >> Marcel
> >>
> >>>
> >>>>> and that gives me the nodeList, but when I attempt to get any
> >>>>>
> > information
> >
> >>>>> about any of those nodes, I get an error:
> >>>>>
> >>>>> errorCode=user.illegalArgument message=#1.1.1 Query of foreign
cluster
> >>>>>
> > node
> >
> >>>>> 'vsp' is not implemented, sorry '/node/vsp/?numTopics' rejected
> >>>>>
> >>>>>
> >>>>>
> >>>> Yes, the forwarding of a __cmd to the remote cluster node to find out
> >>>> its attributes (like topic names) is not implemented.
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>> I can, however, query my local node for the same information and I
get
> >>>>>
> > it:
> >
> >>>>> <key oid='__cmd:/node/stauntonstc/?numTopics'/>' = <qos> <isGet/>
> >>>>>
> > </qos>
> >
> >>>>> <key oid='__cmd:/node/stauntonstc/?numTopics'/> <content
> >>>>> type='String'>3</content>
> >>>>>
> >>>>> I really just need a simple method to make sure that my local
cluster
> >>>>>
> > node
> >
> >>>>> is in contact with the others.
> >>>>>
> >>>>>
> >>>>>
> >>>> See my first remark above, isn't this enough then?
> >>>>
> >>>> Marcel
> >>>>
> >>>>
> >>>>>
> >>>>> Matt
> >>>>>
> >>>>>
> >>>>> ----- Original Message -----
> >>>>> From: "Marcel Ruff" <mr at marcelruff.info>
> >>>>> To: <xmlblaster-devel at server.xmlBlaster.org>
> >>>>> Sent: Wednesday, March 08, 2006 7:56 PM
> >>>>> Subject: Re: [xmlblaster-devel] Get connection states of connected
> >>>>>
> > nodes...
> >
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Matthew Sargent wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> Hi,
> >>>>>>>
> >>>>>>> We are using the simple domain to master mapping and have setup
> >>>>>>> several mater/slave relationships. I would like to test if the
> >>>>>>> xmlBlaster instance I am connected to is further connected to
others
> >>>>>>> in the cluster. I have a list of domains that I am making
> >>>>>>> subscriptions to and would like to use those to figure out if the
> >>>>>>> masters associated with each particular domain is connected. I see
> >>>>>>> many examples if you already have the master node id, but is there
a
> >>>>>>> way to get the master node id for a domain so I can use that to
> >>>>>>>
> > query
> >
> >>>>>>> the connection state?
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>> Hmm, probably not out of the box ...
> >>>>>>
> >>>>>> What you can certainly to is to register a native plugin in
> >>>>>> xmlBlasterPlugins.xml,
> >>>>>> you can take a copy of org.xmlBlaster.engine.EventPlugin.java as a
> >>>>>>
> > base
> >
> >>>>>> and throw
> >>>>>> out everything you don't need.
> >>>>>> Find the code line where
> >>>>>> this.engineGlob = ...
> >>>>>> is assigned.
> >>>>>> With this you can call
> >>>>>>
> >>>>>> ClusterNode[] nodes =
> >>>>>> this.engineGlob.getClusterManager().getClusterNodes();
> >>>>>> for (int i=0; i<nodes.length; i++) {
> >>>>>> ClusterNode node = nodes[i];
> >>>>>> node.getConnectionState(); // See javadoc, marks alive,
> >>>>>>
> > polling
> >
> >>>>>> node.getId(); // the nodes name
> >>>>>>
> >>>>>>
> >>>>>> Now you know the cluster nodes and if the connection is alive.
> >>>>>>
> >>>>>> On the other side note that the EventPlugin implements
> >>>>>> I_SubscriptionListener.
> >>>>>> With this listener you get notifed about all coming and going
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> subscriptions:
> >>>>>
> >>>>>
> >>>>>
> >>>>>> public void subscriptionAdd(SubscriptionEvent subscriptionEvent)
{
> >>>>>> SubscriptionInfo subscriptionInfo =
> >>>>>> subscriptionEvent.getSubscriptionInfo();
> >>>>>> String domain = subscriptionInfo.getKeyData().getDomain();
> >>>>>> ...
> >>>>>> }
> >>>>>> public void subscriptionRemove(SubscriptionEvent
subscriptionEvent)
> >>>>>>
> > {
> >
> >>>>>> ...
> >>>>>> }
> >>>>>>
> >>>>>> Now you know about all subscribed domains.
> >>>>>>
> >>>>>> You could now publish a PtP message to the clients interested or
> >>>>>>
> > better
> >
> >>>>>> publish the current list
> >>>>>> to a topic (say oid="myCurrentDomainList") where your clients
> >>>>>>
> > retrieve
> >
> >>>>>> it from with get().
> >>>>>>
> >>>>>> regards
> >>>>>> Marcel
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> I would like to use the con.get() to gather this information
> >>>>>>> periodically so I can report on connection status.
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>>
> >>>>>>> Matt
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>
> >>>
> >>>
> >
> >
> >
>
>