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Date: Sat, 16 Sep 2006 21:15:22 -0700 (PDT)
From: "James Clark (JIRA)" <jira@apache.org>
To: axis-c-dev@ws.apache.org
Subject: [jira] Created: (AXIS2C-290) Improve IO architecture to minimize
 copying
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Improve IO architecture to minimize copying
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                 Key: AXIS2C-290
                 URL: http://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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