engine_config.hpp

/*

Copyright (c) 2017, Project OSRM contributors
All rights reserved.

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are permitted provided that the following conditions are met:

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list of conditions and the following disclaimer in the documentation and/or
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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*/

#ifndef ENGINE_CONFIG_HPP
#define ENGINE_CONFIG_HPP

#include "storage/storage_config.hpp"

#include <boost/filesystem/path.hpp>

#include <string>

namespace osrm
{

namespace engine
{

/**
 * Configures an OSRM instance.
 *
 * You can customize the storage OSRM uses for auxiliary files specifying a storage config.
 *
 * You can further set service constraints.
 * These are the maximum number of allowed locations (-1 for unlimited) for the services:
 *  - Trip
 *  - Route
 *  - Table
 *  - Match
 *  - Nearest
 *
 * In addition, shared memory can be used for datasets loaded with osrm-datastore.
 *
 * You can chose between three algorithms:
 *  - Algorithm::CH
 *      Contraction Hierarchies, extremely fast queries but slow pre-processing. The default right
 * now.
 *  - Algorithm::CoreCH
 *      Deprecated, to be removed in v6.0
 *      Contraction Hierachies with partial contraction for faster pre-processing but slower
 * queries.
 *  - Algorithm::MLD
 *      Multi Level Dijkstra, moderately fast in both pre-processing and query.
 *
 * \see OSRM, StorageConfig
 */
struct EngineConfig final
{
    bool IsValid() const;

    enum class Algorithm
    {
        CH,
        CoreCH, // Deprecated, will be removed in v6.0
        MLD
    };

    storage::StorageConfig storage_config;
    int max_locations_trip = -1;
    int max_locations_viaroute = -1;
    int max_locations_distance_table = -1;
    int max_locations_map_matching = -1;
    double max_radius_map_matching = -1.0;
    int max_results_nearest = -1;
    int max_alternatives = 3; // set an arbitrary upper bound; can be adjusted by user
    bool use_shared_memory = true;
    Algorithm algorithm = Algorithm::CH;
    std::string verbosity;
};
}
}

#endif // SERVER_CONFIG_HPP