Use page-backed buffers for C++ serialization input or output
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Key: AVRO-508
URL: https://issues.apache.org/jira/browse/AVRO-508
Project: Avro
Issue Type: New Feature
Components: c++
Reporter: Scott Banachowski
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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