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From Sadeep Jayasumana <>
Subject Introducing a new feature to enable MTOM attachment streaming
Date Mon, 25 Jul 2011 06:16:31 GMT
Hi Devs,

In Apache Syanpse, we have a requirement to proxy an MTOM enabled web
service with minimum overhead. Large files (even in GB range) should be able
to go through Synapse without running it OOM.

To satisfy this requirement, Synapse should be able to forward an incoming
SOAP message with MTOM attachments to the backend service without building
the attachments. Synapse might read/modify the SOAP envelop but not the
attachments. Therefore, it should be possible to stream attachments directly
from the Synpase's client to the backend service.

However, in the current implementation of AXIOM and Axis2, MTOM attachments
are built (in memory or in a file) by SOAPMessageFormatter. This caused
Synapse to run OOM when in the above mentioned scenario.

I have come up with a fix for this. It is to introduce a
new org.apache.axiom.attachments.impl.AbstractPart implementation which
streams non-soap MIME parts without building them.

To introduce this new feature without breaking existing stuff, I'm planning
to introduce a new message context property which enables MTOM streaming.
org.apache.axis2.builder.BuilderUtils class will check this property in the
message context and create org.apache.axiom.attachments.Attachments
object accordingly. Does this sound like the correct way of introducing this

Appreciate your feedback.

Sadeep Jayasumana
Software Engineer,
WSO2 Inc.

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