Re: [xmlblaster] distributed cluster protocol

[Michele Laghi <laghi at swissinfo.org>]

Hi again Michael,
sorry for not being able to give you a date for that, I just know it is 
on the todo list. When the time comes it will certainly make noise on 
this list ;)

Michele


Michael Atighetchi wrote:
> Hi Michele,
>
> thanks for the info - this was exactly the level of details I was
> looking for. I'll start working on the PublishFilter plugins next
> week, and will eventually transition the protocol over when mirroring
> becomes available. Do you have a rough idea when this would be ?
>
> Thanks
> Michael
>
>
>
>
> On Sat, May 03, 2003 at 03:34:09PM +0200, Michele Laghi wrote:
>
> > Hi Michael,
> > I guess the cleanest way to do that is to use the clustering framework. 
> > However I think we need Mirroring for that. Unfortunately is Mirroring 
> > not implemented yet.
> >
> > Meanwhile a solution would be to have a plugin implementing 
> > I_PublishFilter on X:
> >
> > It would act as a client to A, B and C. In its method intercept it would 
> > publish to these servers and thereby automatically get an acknowledge 
> > from them.
> >
> > Servers A, B, C have another plugin (implementing I_PublishFilter) which 
> > acts as a client to the own server. In its intercept method they would 
> > publish a PtP message to the client (you have the address of the client 
> > in the MsgUnit) simulating that way the acknowledge to the client.
> >
> >
> >      <__________PtP____________________
> >      <__________PtP__________________  '
> > Client <===> Server X<====> Server A--' '
> >                    |<====> Server B----'
> >                    |<====> Server C----
> >      <------PtP------------------------'
> >
> > Michele
> >
> >
> >
> > Michael Atighetchi wrote:
> >
> > > Xmlblaster team,
> > >
> > > I'm planning on implementating a distributed protocol for pub/sub/and
> > > query on top of xmlblaster, and am wondering which plugin would be
> > > best fitted to do so.
> > >
> > > To give you an example of my procotol, and publish will go to a
> > > server (X). X then acks the message back to
> > > the client, and disseminates the message on to 3 other
> > > servers. Each server will then ack the message back to the client (so
> > > obviously the message has to contain a client endpoint) and to X. The 
> > > client
> > > waits for 3 successful acks, and then terminates the publish method.
> > >
> > > How difficult do you think would it be to implement such a protocol ?
> > > Which plugin would one use ?
> > > I was looking at I_Plugin and I_PublishFilter, but these plugins seem
> > > less to be involved with message routing/handling, which is what I
> > > believe I need.
> > >
> > >
> > > Thanks
> > > Michael


--
Michele Laghi
mailto:laghi at swissinfo.org
tel. +46 8 7492952 / mob. +46 70 4103964
http://www.geocities.com/laghi2000
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