include/colmap/lib/FLANN/mpi/queries.h

/***********************************************************************
 * Software License Agreement (BSD License)
 *
 * Copyright 2008-2011  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
 * Copyright 2008-2011  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
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#ifndef MPI_QUERIES_H_
#define MPI_QUERIES_H_

#include <FLANN/mpi/matrix.h>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/asio.hpp>

namespace flann
{

template<typename T>
struct Request
{
	flann::Matrix<T> queries;
	int nn;
	int checks;

	template<typename Archive>
	void serialize(Archive& ar, const unsigned int version)
	{
		ar & queries & nn & checks;
	}
};

template<typename T>
struct Response
{
	flann::Matrix<int> indices;
	flann::Matrix<T> dists;

	template<typename Archive>
	void serialize(Archive& ar, const unsigned int version)
	{
		ar & indices & dists;
	}
};


using boost::asio::ip::tcp;

template <typename T>
void read_object(tcp::socket& sock, T& val)
{
	uint32_t size;
	boost::asio::read(sock, boost::asio::buffer(&size, sizeof(size)));
	size = ntohl(size);

	boost::asio::streambuf archive_stream;
	boost::asio::read(sock, archive_stream, boost::asio::transfer_at_least(size));

	boost::archive::binary_iarchive archive(archive_stream);
	archive >> val;
}

template <typename T>
void write_object(tcp::socket& sock, const T& val)
{
	boost::asio::streambuf archive_stream;
	boost::archive::binary_oarchive archive(archive_stream);
	archive << val;

	uint32_t size = archive_stream.size();
	size = htonl(size);
	boost::asio::write(sock, boost::asio::buffer(&size, sizeof(size)));
	boost::asio::write(sock, archive_stream);

}

}



#endif /* MPI_QUERIES_H_ */