[Caml-list] Distributed messaging in Ocaml

[Caml-list] Distributed messaging in Ocaml

[Katherine Moore]

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Hi!  My name is Kate Moore, and I am doing a senior design project at the University of Pennsylvania.  I am working with Benjamin Pierce and Alan Schmitt.  

I am trying to implement a scalable, peer-to-peer data sharing system based on a Unison-like algorithm, and I am looking for tools to help with distributed message passing.  Any suggestions about what is available for use with Ocaml would be extremely helpful.  

Thanks very much, 

Kate
:)

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Re: [Caml-list] Distributed messaging in Ocaml

[Sylvain LE GALL]

On Tue, Sep 30, 2003 at 11:07:57AM -0400, Katherine Moore wrote:
> Hi!  My name is Kate Moore, and I am doing a senior design project at the University of Pennsylvania.  I am working with Benjamin Pierce and Alan Schmitt.  
> 
> I am trying to implement a scalable, peer-to-peer data sharing system based on a Unison-like algorithm, and I am looking for tools to help with distributed message passing.  Any suggestions about what is available for use with Ocaml would be extremely helpful.  
> 
> Thanks very much, 
> 
> Kate
> :)

Hello,

I think you should take a look at ensemble. It seems to be a great tool
to do what you are describing.

Another option, but i don't know it very well, is to have a look to
ocaml-soap, xml-rpc et al. I think it should also work.

All this link are in the humps.

Regard
Sylvain LE GALL

ps : take a look at mldonkey for a p2p application in ocaml. 
pps : i will be very intersted in the result

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Re: [Caml-list] Distributed messaging in Ocaml

[Florian Hars]

Sylvain LE GALL wrote:
> On Tue, Sep 30, 2003 at 11:07:57AM -0400, Katherine Moore wrote:
>>I am trying to implement a scalable, peer-to-peer data sharing system
 >
> I think you should take a look at ensemble. It seems to be a great tool
> to do what you are describing.

No, last time I looked at it, I came to the conclusion that in its current form
ensemble is completely unusable in a P2P environment, since the protocol
requires that you can trust the intergity of the clients connecting to the
network. It just stuffs the bytes received from the net into
Marshal.from_something (which explains part of its speed). You would have to
implement a typesafe marshalling layer that does integrity checks on the
received messages.
Another possible problem: frequent joins and leaves (as you might expect in a
successful P2P environment) might keep the nodes busy syncronizing views and
electing new leaders and leave no time for actual data exchange.

Yours, Florian.

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Re: [Caml-list] Distributed messaging in Ocaml

[Benjamin Geer]

On Tue, Sep 30, 2003 at 11:07:57AM -0400, Katherine Moore wrote:
> I am trying to implement a scalable, peer-to-peer data sharing system

MLdonkey (http://mldonkey.berlios.de/) is a multi-protocol, open-source 
(and apparently widely used) P2P client written in Caml; maybe there's 
some code in it that would be useful.

Ben

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