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From "Scott Banachowski (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AVRO-508) Use page-backed buffers for C++ serialization input or output
Date Mon, 05 Apr 2010 21:10:27 GMT

     [ https://issues.apache.org/jira/browse/AVRO-508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Banachowski updated AVRO-508:
-----------------------------------

    Attachment: applypatch508.sh
                AVRO-508.patch

Patch, and script to apply patch

> Use page-backed buffers for C++ serialization input or output
> -------------------------------------------------------------
>
>                 Key: AVRO-508
>                 URL: https://issues.apache.org/jira/browse/AVRO-508
>             Project: Avro
>          Issue Type: New Feature
>          Components: c++
>            Reporter: Scott Banachowski
>         Attachments: applypatch508.sh, AVRO-508.patch
>
>
> This change came about when I looked at how to tie the object container and http changes
to the serializer.
> The current implementation of C++ allows serialization to and from C++  iostreams.  However,
typically I want to serialize to a buffer, which I can write to disk or network (or both).
 While iostreams do buffering, they're not well-suited if you just want to store to memory
(the unittest examples serialize to ostringstream then extract the data as a string--not so
efficient).  
> So I've added a buffering library, that does page-backed allocations (adds a page as
buffer grows).  It also supports the concept classes defined by boost::asio for Constant and
Mutable buffer sequences (this allows the buffers to be used directly in asio networking calls),
conversion to iovec, appending of foreign buffers, and iostream interface wrapper, so it's
pretty flexible in the way it can be used.

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