Re: SOAP-over-UDP

Mon, 30 May 2005 22:29:08 -0700

I'm afraid that is a very verbose way of doing things. The typical way to do this is determine a port, have your server broadcast its IP address on that port, and your clients look on that port to grab the address.
Once the address is found, you can safely interact with the server using SOAP over HTTP. 

Le 30 mai 05 � 22:19, Francesco Munari a �crit :


I'm alredy using UDDI4j. The idea is that I don't know where the UDDI
registry can be in the LAN.
I assume that the client knows only two things:
1) the network (of course)
2) a "search key" for a particular tipe of service

and that's all.
The client should send a broadcast SOAP (or XML-RPC) request
containing the search method to call on the server with the "key"
passed as a parameter and somewhere into the LAN should be a server
(or more) with its private UDDI registry that should reply with a
response containing the result of the invoking of the method contained
in the sender's RPC request. The response should contain just the URL
of the WSDL file related to the service found.

The need of the broadcast message is that the client don't know where
(or if) there could be any UDDI registry in the network. With this
framework a client can change network configuration (for example,
going from a floor to another with a Palm in a wireless LAN) and,
after leaving the service provided in the first network, find anothe
one similar on the other network only by pressing the button "Refresh"
:)

Francesco

2005/5/30, Martin Gainty <[EMAIL PROTECTED]>:


The side effect of a broadcast without authentication is flooding the
network with unwanted disovery packets

I guess this is OK if you're utilising a high datarate  
transmission i guess


In your case your SOAP Request should look like

<?xml version="1.0"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"; >
 <SOAP-ENV:Body>
   <getTest>
     <Test>Test</Test>
   </getTest>
 </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

If you want to discover a "SOAP based" web-service based on some
characteristic such as Business Service Category why not use UDDI4J?
Take a look at
http://sourceforge.net/projects/uddi4j

Martin-

----- Original Message -----
From: "Francesco Munari" <[EMAIL PROTECTED]>
To: "Martin Gainty" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Monday, May 30, 2005 12:44 PM
Subject: Re: SOAP-over-UDP

Martins,

It is for this reason that I'd like to broadcast a SOAP request
instead of a simple XML-RPC message. The goal of my framework is to
keep the "context awareness" offered by XML language.

If you are sure that there is no way to send a broadcast SOAP  
request,

the last solution, I think, it could be XML-RPC.

So, two questions:

1) are you sure ther's no way to send a broadcast SOAP request?
2) In order to send a broadcast XML-RPC message I've to cerate a
StringWriter like this (for example)?

<?xml version="1.0" ?>
  <methodCall>
      <methodName>getTest</methodName>
      <params>
          <param>
              <value>
                 <string>Test</string>
              </value>
          </param>
      </params>
</methodCall>

Thank's Martin.

Francesco

2005/5/30, Martin Gainty <[EMAIL PROTECTED]>:


Francesco-

You can Broadcast XML-RPC assuming you dont mind flooding your  
network
The question is can you confine your application to using the  
more basic

datatypes supported by XML-RPC

vs implementing SOAP features (user-defined datatypes, namespace  
URI)?

Anyone else?
Martin-
----- Original Message -----
From: "Francesco Munari" <[EMAIL PROTECTED]>
To: "Martin Gainty" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Monday, May 30, 2005 6:45 AM
Subject: Re: SOAP-over-UDP

Grazie! :)

Could someone tell me if a simple XML-RPC message may be sent to a

broadcast address? A simple message with the medthod to be  
invoked. In
this way I should be able to send a broadcast XML-RPC request  
with the
appropriate UDDI inquiry method; a server (containing a UDDI  
registry)

should receive it, invoke that method and send a reply in XML format
to the sender.

It could be a good idea?

thank you again!

Francesco

2005/5/29, Martin Gainty <[EMAIL PROTECTED]>:


benvenuto!
Martin-

----- Original Message -----
From: "Francesco Munari" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, May 28, 2005 5:41 PM
Subject: Re: SOAP-over-UDP

Thank you all for your very quick reply!

I've heard about this SOAP-over-UDP spec

(http://msdn.microsoft.com/library/default.asp?url=/library/en- 
us/dnglobspec/html/soap-over-udp.asp).
So, Martin, you say that it could not be a solution? Perhaps it  
should

be an idea using Mark's solution (with DNS).

I thought to resolve the problem putting a SOAP envelope into a UDP
datagram, send the datagram to a broadcast ip and that's all
folks...but I don't know how and, as you, Martins, wrote, I was not
able to find anybody who has implemented this yet.

Can you suggest me another solutions?

Thank you very much again!!

Cheers,

Francesco

2005/5/28, Martin Gainty <[EMAIL PROTECTED]>:


Mark/Francesco

I would caution on use of UDP as the SOAP Portocols (e.g. HTTP)  
is/are

decidely not UDP but instead a connection-oriented TCP

To date I have not seen UDP Ports used for SOAP transmission  
although

since

there is no requirement for verifiable connection and or  
handshakes
I would venture to guess UDP is available as the transmission  
medium

but
I
have not seen any UDP Ports used for SOAP thus far
Anyone else ???
Ciao-
Martin-

----- Original Message -----
From: "mdonaghue" <[EMAIL PROTECTED]>
To: <[email protected]>; "'Francesco Munari'"
<[EMAIL PROTECTED]>
Sent: Saturday, May 28, 2005 3:14 PM
Subject: RE: SOAP-over-UDP



Hi Franceso,


I've worked briefly with the apache soap api, not that  
familiar with

it.
Typically a soap message is sent to a single soap server address,
which
is
specified by a url or an ip address, as well as a port. So your
server

address on the LAN might be something like 192.168.100.2:8080.  
(I'm

not
sure

what the port is for UDDI, so just using standard TomCat Web  
Server

port).


IIRC, you there's a point at which you specify that address in  
the

setup
for

your soap call. One thing you could try is to change the  
address to

the

subnet's broadcast address, 255.255.255.0:8080, assuming a  
class c

network

where the first 3 quads specify the network portion of the  
submask.


However, this may not a scalable solution, since the broadcast
wouldn't
carry beyond the physical subnet on which you are located. Using
UDDI
to
discover services is one thing, but dynamically discovering UDDI
servers
is

obviously a different problem. It also doesn't address the  
issue of

more
than one UDDI server running on the same subnet.

A more generalized solution might involve a distributed ip lookup
service,
namely DNS. For example when DNS looks up the ip address of
Yahoo.com,
at
some point the actual ip address that serves the request is
dynamically
assigned to one of dozens (or hundreds) of servers based on a
scheduling
scheme.  You could locally enable DNS lookup, and create an entry
based
on
some url like "myuddpsever.com", and give it your local UDDI
server's
ip
address, and the rest would be handled within the network. The
advantage
to
this is your UDDP server could be anywhere and your message would
still
reach it.

hth,
Mark





-----Original Message-----
From: Francesco Munari [mailto:[EMAIL PROTECTED]
Sent: Saturday, May 28, 2005 4:58 AM
To: [email protected]
Subject: SOAP-over-UDP

Hi, I'm desperate!
I'm trying to find out how to send a broadcast SOAP request to a
UDDI

registry in a LAN, but I'm not able to do this. I've looked  
for some

example but I've not found anithing.

Please...could anybody help me?
I'm making a thesis for the University of Florence (Italy) and I
have

to discovery dinamically web service published in some UDDI  
registry
somewhere in a LAN. I have to send a broadcast SOAP request to  
these

UDDI registry (as I wrote few lines above).
Of course I'm using Java language.

Thank you very much for your help...I'm in a great hurry...thanks
very
very much to everyone could help me!

Best reguards,

Francesco









































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