client.h

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 * 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_CLIENT_H_
#define MPI_CLIENT_H_
 
#include <cstdlib>
#include <boost/asio.hpp>
#include <FLANN/util/matrix.h>
#include <FLANN/util/params.h>
#include "queries.h"
 
namespace flann {
namespace mpi {
 
 
class Client
{
public:
    Client(const std::string& host, const std::string& service)
    {
        tcp::resolver resolver(io_service_);
        tcp::resolver::query query(tcp::v4(), host, service);
        iterator_ = resolver.resolve(query);
    }
 
 
    template<typename ElementType, typename DistanceType>
    void knnSearch(const flann::Matrix<ElementType>& queries, flann::Matrix<int>& indices, flann::Matrix<DistanceType>& dists, int knn, const SearchParams& params)
    {
        tcp::socket sock(io_service_);
        sock.connect(*iterator_);
 
        Request<ElementType> req;
        req.nn = knn;
        req.queries = queries;
        req.checks = params.checks;
        // send request
        write_object(sock,req);
 
        Response<DistanceType> resp;
        // read response
        read_object(sock, resp);
 
        for (size_t i=0;i<indices.rows;++i) {
            for (size_t j=0;j<indices.cols;++j) {
                indices[i][j] = resp.indices[i][j];
                dists[i][j] = resp.dists[i][j];
            }
        }
    }
 
 
private:
    boost::asio::io_service io_service_;
    tcp::resolver::iterator iterator_;
};
 
 
} //namespace mpi
} // namespace flann
 
#endif // MPI_CLIENT_H_