Re: Re: [xmlblaster-devel] Get connection states of connected nodes...

[Matthew Sargent <matt.sargent at cox.net>]

Marcel,

Thanks again... Pardon me for being dense...
> 
> From: Marcel Ruff <mr at marcelruff.info>
> Date: 2006/03/09 Thu PM 06:14:14 EST
> To: xmlblaster-devel at server.xmlBlaster.org
> Subject: Re: [xmlblaster-devel] Get connection states of connected nodes...
> 
> Matthew Sargent wrote:
> > Marcel,
> >
> > Thanks for the info, that sounds like the way to do it, but it may be more
> > than I really need right now. Given that I have a list of the node ids, can
> > I make a simple query to see if they are connected to my local xmlBlaster
> > instance? I can query my local node for the nodeList using:
> >
> > MsgUnit[] msgs = con.get(
> >                             "<key oid='__cmd:/node/?nodeList'/>",
> >                             "<qos/>");
> >   
> Say we have the master 'heron' and the slave 'avalon'.
> If you open jconsole for heron you will see avalon as a client and you 
> click into its session to see its connection state.
> The same is possible with __cmd: messages/telnet.

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)


> > 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
> >>>       
> >
> >
> >   
> 
>