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From "Sagara Gunathunga (JIRA)" <>
Subject [jira] [Commented] (AXIS2-5308) Attachments semantics are different for incoming and outgoing messages
Date Sun, 29 Apr 2012 14:41:50 GMT


Sagara Gunathunga  commented on AXIS2-5308:

+1 for your proposal and make it a clear API.
 Going further is there any possibility to use generic semantics for both MTOM and SwA ?
> Attachments semantics are different for incoming and outgoing messages
> ----------------------------------------------------------------------
>                 Key: AXIS2-5308
>                 URL:
>             Project: Axis2
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 1.6.2
>            Reporter: Andreas Veithen
>            Priority: Minor
> The message builders for MTOM and SwA both initialize the message context with an Attachments
object that contains all MIME parts, including the root part. On the other hand, the corresponding
message formatters have different expectations. The message formatter for MTOM doesn't look
at the Attachments object in the message context because attachments are referenced by special
OMText instances in the SOAP envelope. Finally, the message formatter for SwA assumes that
the Attachments object in the message context only contains the attachment parts.
> This means that for MTOM and SwA messages, the message context is set up differently
for incoming and outgoing messages. Such inconsistencies in the API are not only annoying,
but they also cause subtile issues in Synapse which needs to be able to forward messages,
i.e. transform incoming into outgoing messages. One such issue is described in SYNAPSE-867.
> The proposal is to change the semantics for incoming messages, such that they match the
current semantics for outgoing messages. In practice this means:
> 1. The Attachments object in the message context would no longer be set for MTOM messages.
In fact, code that attempts to directly access the MIME parts of an MTOM message is broken
by definition, because the sender is free to choose which base64Binary elements are sent as
attachments and which ones are inlined.
> 2. The message builder for SwA would remove the root part from the Attachments object
before adding it to the message context, so that application code only sees attachments parts.
In fact, there is no valid use case where application code would want to retrieve the SOAP
part directly from the Attachments object.

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