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https://issues.apache.org/jira/browse/AXIS2C-290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592284#action_12592284
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Damitha Kumarage commented on AXIS2C-290:
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James has detailed this approach cleanly and it seems that expat parser also
fits well with that design. So I suggest this is a good project for a next GSOC
project :).
> Improve IO architecture to minimize copying
> -------------------------------------------
>
> Key: AXIS2C-290
> URL: https://issues.apache.org/jira/browse/AXIS2C-290
> Project: Axis2-C
> Issue Type: Improvement
> Reporter: James Clark
>
> At the moment, there's a lot of inefficiency in how data moves through the
> system. Data (especally binary data) is copied multiple times, and often
> multiple copies of potentially large data items are held in memory. The
> design needs revisiting so as to minimize copying.
> Apache2's native IO interface is "bucket brigades". At the moment, we're not
> using this but rather the Apache 1.x compatibility layer that is built on top
> of this. This is causing an unnecessary copy of data both on input and
> output. The design goals should include:
> - the XML parser should be able to operate directly on bytes in a bucket
> brigade
> - the MIME parser should be able to operate directly on bytes in a bucket
> brigade
> - when a binary blob in the axiom tree (what is currently called a data
> handler) comes from MTOM optimizsed input, it should refer to bytes in the
> Apache bucket brigade
> - when a binary blob in the axiom tree is output using MTOM, that blob should
> be passed for output to Apache without any copying
> - when data is encrypted, the encrypted bytes should be stored once and then
> passed for output to Apache without any copying
> - when the message body is signed, it should be serialized once; this
> serialization should both be used for signing and be passed for output to
> Apache without copying (this is particularly tricky because the MTOMification
> is applied for output but not for signing)
> - the design is not too tightly coupled to Apache2's bucket brigades
> interface.
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