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fix performance regression in output generation, use copy elision and return result char array

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This commit is contained in:
Dennis Luxen 2015-01-26 13:35:24 +01:00
parent 37a9813482
commit 06a08a874f
2 changed files with 10 additions and 10 deletions
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13
Server/Connection.cpp
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@ -86,7 +86,7 @@ void Connection::handle_read(const boost::system::error_code &error, std::size_t
case deflateRFC1951:
// use deflate for compression
reply.headers.insert(reply.headers.begin(), {"Content-Encoding", "deflate"});
CompressBufferCollection(reply.content, compression_type, compressed_output);
compressed_output = compress_buffers(reply.content, compression_type);
reply.SetSize(static_cast<unsigned>(compressed_output.size()));
output_buffer = reply.HeaderstoBuffers();
output_buffer.push_back(boost::asio::buffer(compressed_output));
@ -94,7 +94,7 @@ void Connection::handle_read(const boost::system::error_code &error, std::size_t
case gzipRFC1952:
// use gzip for compression
reply.headers.insert(reply.headers.begin(), {"Content-Encoding", "gzip"});
CompressBufferCollection(reply.content, compression_type, compressed_output);
compressed_output = compress_buffers(reply.content, compression_type);
reply.SetSize(static_cast<unsigned>(compressed_output.size()));
output_buffer = reply.HeaderstoBuffers();
output_buffer.push_back(boost::asio::buffer(compressed_output));
@ -142,9 +142,8 @@ void Connection::handle_write(const boost::system::error_code &error)
}
}
void Connection::CompressBufferCollection(std::vector<char> uncompressed_data,
CompressionType compression_type,
std::vector<char> &compressed_data)
std::vector<char> Connection::compress_buffers(const std::vector<char> &uncompressed_data,
const CompressionType compression_type)
{
boost::iostreams::gzip_params compression_parameters;
@ -156,12 +155,14 @@ void Connection::CompressBufferCollection(std::vector<char> uncompressed_data,
compression_parameters.noheader = true;
}
BOOST_ASSERT(compressed_data.empty());
std::vector<char> compressed_data;
// plug data into boost's compression stream
boost::iostreams::filtering_ostream gzip_stream;
gzip_stream.push(boost::iostreams::gzip_compressor(compression_parameters));
gzip_stream.push(boost::iostreams::back_inserter(compressed_data));
gzip_stream.write(&uncompressed_data[0], uncompressed_data.size());
boost::iostreams::close(gzip_stream);
return compressed_data;
}
}

7
Server/Connection.h
View File

@ -1,6 +1,6 @@
/*
Copyright (c) 2013, Project OSRM, Dennis Luxen, others
Copyright (c) 2015, Project OSRM, Dennis Luxen, others
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
@ -75,9 +75,8 @@ class Connection : public std::enable_shared_from_this<Connection>
/// Handle completion of a write operation.
void handle_write(const boost::system::error_code &e);
void CompressBufferCollection(std::vector<char> uncompressed_data,
CompressionType compression_type,
std::vector<char> &compressed_data);
std::vector<char> compress_buffers(const std::vector<char> &uncompressed_data,
const CompressionType compression_type);
boost::asio::io_service::strand strand;
boost::asio::ip::tcp::socket TCP_socket;