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From "Paul Fremantle" <pzf...@gmail.com>
Subject Re: [Axis2] Importance of SwA (Need Your Feedback)
Date Wed, 19 Jul 2006 20:06:08 GMT
Hamid

Its been too long since I looked at SwA. Doesn't it look sort of like
MTOM but without XOP?

Paul

On 7/19/06, Ben Malek, Hamid <HBenMalek@us.fujitsu.com> wrote:
>
>
>
>
> Let me explain why it is important to fully support SwA in Axis2. As you
> know, ebMS is heavily built on SwA. The latest version of ebMS (ebMS-3) is
> still relying on SwA (support for MTOM will only be in the second part of
> the spec, but the B2B space will still be using SwA for many years to come).
> We have designed ebMS-3 specification in a way to make the convergence
> between ebXML and Webservices possible. With ebMS-3, it is easier to compose
> webservices with an MSH. However, not fully supporting SwA in Axis2 doesn't
> make things smoother.
>
>
>
> Consider the following example. Suppose you would like to have an axis2
> service that accepts an SwA message as input and returns an SwA as response.
> The SwA message could be for example a multipart/related
> javax.mail.internet.MimeMessage object. To accomplish this, you would write
> a MessageReceiver that constructs the MimeMessage from the axiom SOAP
> envelope and attachments object present in the MessageContext and hand it
> over to the service. When the service returns an SwA (that is a
> MimeMessage), the MessageReceiver would construct an axiom SOAP envelope
> that will be put in the response, and then it will extract the other parts
> of the MimeMessage and put them in an Attachments object that would be
> placed as a property of the MessageContext, and finally call the
> AxisService.send(msgContext) to tell Axis2 to process the handler chain and
> send the response back to the client. The problem with this is that the http
> transport senders would only serialize the axiom SOAP envelope back to the
> client without fetching the Attachments object present in the MessageContext
> and serializing the attachments as well. To correct this situation the
> service developer would have to also write his own http transport sender
> that takes into consideration the attachments property of the
> MessageContext. Doing this is not good, because the service developer should
> not write more than the service code and the MessageReceiver class.
>
>
>
> The other problem I mentioned in my previous email (see below) was the
> inability to construct an SwA message using only Axiom API. You may say that
> Axiom was designed only for MTOM and that Axiom by its nature is only for
> XML contents not something like a mutipart/related
> javax.mail.internet.MimeMessage format. So, constructing a MimeMessage with
> Axiom API may sound as nonsense. There is a problem with thinking this way:
> Axis2 is built around Axiom and uses Axiom as its blood stream, while at the
> same time Axis2 does not provide any other APIs or other Object Model
> besides Axiom. Therefore, it becomes the responsibility of Axiom API to be
> able to handle SwA as well, even though it was only meant for XML contents.
>
>
>
> Please let me know what your thoughts are.
>
>
>
> Thank you very much for the good work.
>
>
>
> Hamid.
>
>
>
>  ________________________________
>
>
> From: Ben Malek, Hamid [mailto:HBenMalek@us.fujitsu.com]
>  Sent: Tuesday, July 18, 2006 9:35 PM
>  To: axis-user@ws.apache.org
>  Cc: axis-dev@ws.apache.org
>  Subject: RE: [Axis2] Help with SwA
>
>
>
> I have a big problem making Axis2 work fine with SwA.
>
> 1.    The first problem is that I could not find any documentation on how to
> programmatically construct a SwA SOAP message using AXIOM API only. You can
> only construct MTOM SOAP messages with Axiom but not SwA. The example of SwA
> given by axis2 is just reading a SwA message from a file (the file already
> contains a serialized SwA message).
>
> 2.    The second problem is that it seems to me so far that axis2 only
> support SwA in one direction only. That is, the axis servlet is able to
> parse a SwA message from the servlet input stream (and it stores the
> attachments in an Attachments object as a property of the MessageContext).
> However, this attachments object is not used anywhere in the code. This
> means that if a service is returning a SwA message (not an MTOM message),
> axis2 will only serialize the SOAP envelope without the attachments. The
> http transport senders only serialize the SOAP envelope on the wire but not
> the attachments (maybe they do it for an MTOM message, but they do not do it
> for a SwA message since the attachments object of the MessageContext is not
> used at all in the code except when parsing the input stream in the axis
> servlet).
>
>
>
> Please correct me if I am wrong.
>
>
>
> Thank you very much for any help.
>
>
>
> Hamid.


-- 
Paul Fremantle
VP/Technology, WSO2 and OASIS WS-RX TC Co-chair

http://bloglines.com/blog/paulfremantle
paul@wso2.com

"Oxygenating the Web Service Platform", www.wso2.com

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