Hi Paul,
Interesting I have done some similar work with one of the in house
developped broker at Indiana University. Infact did a reliable broker
as exactly as you said, where the brocker itself can deliver the
messages reliably to the consumers by switching on an configuration.
So this could be done beyond any doubt. (I am afraid the brocker that
i am talking about doesnot have a release for the particular case
though. )
Is there a effort for Axis2 based notification. I might be able to
give some hand if you are planning to develop a brokered
Notification/Eventing on top of Axis2.

Thanks
Chathura

12/12/05, Paul Fremantle <pzfreo (AT) gmail (DOT) comwrote:
IV

There is a specification called WS-Eventing which supports the broadcast. If
you want the same message to go to multiple endpoints reliably, then you
need to compose WS-Eventing and WS-ReliableMessaging. We are planning to add
WS-Eventing support as a broker to Apache Synapse, so you could send one
message to the Synapse broker and have it reliably delivered to multiple
endpoints.

Would that work?

As regards clustering, there is no built in support, but there is no reason
that Axis2 cannot be used on a clustered application server or runtime.

Paul

PS If you want more information about how my company is creating a solution
to this problem send me an email to paul (AT) wso2 (DOT) com.
--
12/2/05, IV <spartan2iv (AT) yahoo (DOT) comwrote:
--
Hi,
i have had a look several times on RM I thing there is no way to provide
reliability for many one message directed to many ws using one single
sequence. Sequence have to be tracked and these wc will need individual
tracking since the reponse time might be different However Sandesha could
provide possiblities to be instructed that a message goes to several WS, it
then generate using any alogorith different sequences for every WS. this
frees the application from interetion. The application might then do some
other job while sandesha takes care of this interation keeping the spec
intakt
Any opinion?
>
>
>
"Dittmann, Werner" < werner.dittmann (AT) siemens (DOT) comwrote:
Hi,

just jumping in here with a question: isn't
Benajmin's requirements more related to a transaction
mana ger than to Reliable Message? Transactions
management would imply to have reliable messages (and
probably a sequence) plus the guarantee that all
services have their tasks done (all or nothing
principle).

You may have a look at
--

IMH the specs defined there address Ben's problem.

Regards,
Werner

Nachricht
Von: jaliya (AT) opensource (DOT) lk [mailto:jaliya (AT) opensource (DOT) lk]
Gesendet: Freitag, 2. Dezember 2005 03:50
An: Benjamin Schmeling
Cc: sandesha-dev (AT) ws (DOT) apache.org
Betreff: Re: ws and reliability

Hi,

WS-RM guarantees delivery of messages from one endpoint to
the other. Mainly
between endpoint managers. So there is no way that we can put
messages going
to different endpoints into a single sequence. This is not
what WS-RM for
& gt; and rather is useful when we have many massages to the same endpoint

Thanks,

Jaliya

Message
From: "Benjamin Schmeling"

Cc:
Sent: Thursday, December 01, 2005 4:39 PM
Subject: Re: ws and reliability
--
Hi,
concerning different endpoint it is not possible to put them in one
sequence. But what is when you have calls on different web
services on one
maschine. Is it possible to put them all in one sequence
and how is it
done in sandesha? I tried it out but got an ERRR: MESSAGE
IS NULL IN
ResponseSeqHash.

Thanks,

Benjamin
>
>Hi,
>IMH it is not a feature that should be covered by WS-RM,
it should be a
>feature of the underlying SAP engine.
>For RM all these messages are different sequence if they
are going to
>different endpoints. So if we need to send one message to
2000 stores
>then it will be a 2000 sequence and lot of additional
messages. We can
>use RM but there is are additional overhead involve in it.
However it the
>scenario is such that we need to send 2000 messages to
same recipient,
>then RM is for that and will serve well.
>Thanks,
>Jaliya
>>
>Message
>*From:* IV
>*To:* jaliya (AT) opensource (DOT) lk
>*Sent:* Wednesday, November 30, 2005 3:04 AM
>*Subject:* Re: ws and reliability
>>
&g t; >Hi,
>Thx for the response. However i think the Spec of WS-RM had to
>think about reliably talking to many WS with same
message without
>any interation of sequences. I tried to loop 2000
times for 2000
>stores and for each store i had just to change the URL but same
>message. Not a a good approach
>>
>*/jaliya@ opensource.lk /* wrote:
>>
>Hi,
>>
>Hm interesting scenarioPlease see my comments below.
>>
>Thanks,
>>
>Jaliya
>>
>>
>>
>Message
>From: IV
>To: Benjamin Schmeling ; sandesha-dev (AT) ws (DOT) apache.org
>Sent: Tuesday, November 29, 2005 2:50 PM
>
>Subj ect: Re: ws and reliability
>>
>>
>Hi,
>i have a project that requires the use of either a message
>broker or web
>services.
>HINT: Intend to transfer all daily sales of burger
king stores to
>headquarter. this implies an average of 2000 sto
res connect
>to headquarter
>with 2hours window of transaction. also the possibility of
>burger-king
>headquarter to broadcast price changes to all stores. With
>message brokers
>this is possible like JMS or propriatory ones
using publishing
>and
>subscription.
>Have made studies on WS-RM, WS-Security, WS-Conversation,
>WS-Callback, and
>WS-Policy and thought web services with their
interop they
are better
>than JMS and other MM. I have had a look on Sandesha as
>regards to WS-RM.
>It was quite interesting. My qeuestions after reading this
>mail of using
>sequences in talking to three WS:
>1. Having the same messages for web service A, B, and C is
>there a means
>to braodcast the messages without any interation in
>application level but
>by sim ply listing the endpoints?
>>
>Sandesha does not have a message broadcasting
machanism at the
>transport
>level and it is not a requirement of the WS-RM
specs. For this
>functionality you have to use some mediation
service. Apache
>Synapse will
>do this soon :)
>>
>2. Has Sandesha some implementations of loa d
balance? BEA uses
>Buffers.
>Say 2000 stores all talk simultaneously to one WS.
>>
>Sandesha does not have a built in load balancing mechanism.
>But it may be
>able to handle the load as long as Servlet
container and Axis
>is handling
>the load.
>>
>3. Has Sandesha in built tools for monitoring the flow of
>information at
>transport level or do i have define my handlers for that?
>>
>You can add handler to both request and response flows to
>monitor the
>message flow.
>>
>4. What about WS-Conversation and Callback?
>Implementation of WS-SecCon is still not complete
>>
>thanks
>>
>>
>Benjamin Sc hmeling wrote:
>Hi,
>>
>imagine the scenario, described in the reliable messaging
>specification.
>Now lets assume the webservices are all oneway and
the second
>message
>goes to a third endpoint. I know the specification
suppor ts
>only two
>endpoints, but is there a possibility to do the following:
>>
>1.) call webservice A (at http:/abc.org)
>2.) call webservice B (at http:/cde.org)
>3.) call webservice C (at http:/abc.org)
>>
>I could do this with 3 separate sequences. At
every end of one
>sequence
>endSequence() is called in Sandesha. Can I make
the conclusion
>that
>after calling endSequence() the message to all
webservices in the
& gt;sequence are already successfully delivered?
>
>>
>For example:
>new SandeshaContext()
>call webservice A (at http:/abc.org)
>endSequence()
>// /message to A has been delivered already at
this point of
>code?/
>new SandeshaContext()
>call webservice B (at http:/cde.org)
>
>
>
>>
>Thanks,
>>
>Benjamin
>>
>>
>>
>>
>>
>

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>SUMELNG IV
>UNIVERSITY F DUISBURG-ESSN
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SUMELNG IV
UNIVERSITY F DUISBURG-ESSN
DEPARTMENT F CMPUTER SCIENCE AND
CMMUNICATIN ENGINEERING
SCHEMKESWEG 41
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Germany
HME.: 00492033948762
MBILE.00491797751042
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