[jira] Resolved: (AXIS2C-290) Improve IO architecture to minimize copying

["Samisa Abeysinghe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AXIS2C-290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Samisa Abeysinghe resolved AXIS2C-290.
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    Resolution: Won't Fix

This is kind of implemented with the latest changes to the httpd module and the ongoing work with MTOM parser. 
However, it is not the same implementation as proposed and this proposal should be part of 2.x family, if we ever undertake that mission.

> 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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