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Re: WG:RPC

From: marwan sabbouh <ms@mitre.org>
Date: Thu, 08 Mar 2001 08:14:54 -0500
Message-ID: <3AA785CE.BF1D28BF@mitre.org>
To: Mark Nottingham <mnot@akamai.com>
CC: marwan sabbouh <ftdata@yahoo.com>, rden@loc.gov, xml-dist-app@w3.org
Hi Mark;

> * Those that supply generic, 'pluggable' services, like encryption,
>   authentication, etc. These can be used in any message, they're not
>   transport- or application-specific.


Absolutely

> * Those that are application toolkits, to standardize common
>   functions, like RPC. These might bring requirements in terms of
>   transport or message correlation requirements, and will only be
>   used for certain applications.

another example might be providing delivery semantics, i.e. transaction
or ordered delivery of events.

> * Those that are applications. Not sure of an example here.

wouldn't that be any e-service application?

Mark Nottingham wrote:
> 
> This sounds good. I've been thinking there's three kinds of modules:
> 
> * Those that supply generic, 'pluggable' services, like encryption,
>   authentication, etc. These can be used in any message, they're not
>   transport- or application-specific.
> 
> * Those that are application toolkits, to standardize common
>   functions, like RPC. These might bring requirements in terms of
>   transport or message correlation requirements, and will only be
>   used for certain applications.
> 
> * Those that are applications. Not sure of an example here.
> 
> Does this make sense?
> 
> On Tue, Mar 06, 2001 at 09:35:58AM -0500, marwan sabbouh wrote:
> > first, I m in agreement with the layerd architecture
> > you propose.
> >
> > >what's on
> > >top of the XP layer?  Is it another layer, with a
> > >bunch of modules, one
> > >of whichis RPC, and on top of that, there's the
> > >application?    Or does the application
> > sit on top of the XP layer?
> >
> > In the case of RPC, I have to say that the application
> > sits on top of the RPC module. The app. calls methods
> > implemented by the RPC module.  The rpc module calls
> > method implemented by the XP layer. Below is an
> > examination of an XMLP RPC implementation:
> >
> > The XP client or app. does the following to call a
> > remote mehod:
> > 1-Create an XP transport Binding
> > 2-Serialize the message according to the set of RPC
> > convention for XP and RPC
> > 3-Attach the message to the transport Binding
> > 4- send the message
> > 5-wait for the reply
> >
> > The XP app. sits on top of the XP listener and uses
> > the RPC module. The apps interacts with the RPC module
> > who uses XP objects.
> >
> > 1-The XP binding listener receive the requestand hands
> > off the request to the rpc module
> > 2- The RPC module deserialize the message using the
> > set of conventions defined by XP
> > 3- the RPC module unmarshal method names and params
> > accoeding to xp conventions
> > 4-call the method implemented by the application
> > 5-serialize the reply using the set of conventions
> > defined by XP
> >
> > 6-return to the XP listener
> > 7- Listener sends reply to the client
> >
> >
> > comments please?
> > marwan
> > --- Ray Denenberg <rden@loc.gov> wrote:
> > > marwan sabbouh wrote:
> > >
> > > > we were asked to look into how RPC fit into the
> > > XMLP
> > > > architecture. Is  Rpc a module? or Is it an
> > > > application that sits on top of XMLP?  --
> > >
> > > This is difficult without some layered architecture
> > > to refer to. Can we
> > > informally designate some of the layers we're
> > > talking about, just for a frame of
> > > reference?
> > >
> > > Let's say there's an XP layer. Just below it is,
> > > let's say, the "message
> > > transfer" layer, which may be http or beep. Below
> > > that is the transport layer.
> > >
> > > If we can accept that for sake of discussion, my
> > > question would be, what's on
> > > top of the XP layer?  Is it another layer, with a
> > > bunch of modules, one of which
> > > is RPC, and on top of that, there's the application?
> > >    Or does the application
> > > sit on top of the XP layer?
> > >
> > > --Ray
> > >
> > >
> > > Ray Denenberg
> > > Library of Congress
> > > rden@loc.gov
> > > 202-707-5795
> > >
> > >
> >
> >
> > __________________________________________________
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> >
> 
> --
> Mark Nottingham, Research Scientist
> Akamai Technologies (San Mateo, CA USA)
Received on Thursday, 8 March 2001 07:49:39 GMT

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