saedb/streaming/sgraph.hpp at e84da7993d9b911b81f90d9ee710604f4057f056 · THUKEG/saedb · GitHub

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// The Steraming Graph Interface

#pragma once

#include <cstdint>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iostream>

#include "trigger.hpp"

namespace sae {
namespace streaming {

using vid_t = int64_t;
using eid_t = int64_t;
using tid_t = uint8_t;
using data_t = std::string;

struct Graph {
    vid_t n;
    vid_t m;
};

inline std::ostream& operator<<(std::ostream& os, const Graph& g) {
    os << "graph{n=" << g.n << ", m=" << g.m << "}";
    return os;
}

struct Vertex {
    vid_t id;
    tid_t type;
    data_t data;

    bool operator<(const Vertex& v) const {
        return id < v.id;
    }

    bool operator==(const Vertex& v) const {
        return id == v.id;
    }
};

inline std::ostream& operator<<(std::ostream& os, const Vertex& v) {
    os << "vertex{id=" << v.id << ", type=" << int(v.type) << ", data=" << v.data << "}";
    return os;
}

struct Edge {
    eid_t id;
    vid_t source;
    vid_t target;
    tid_t type;
    data_t data;

    bool operator<(const Edge& e) const {
        return id < e.id;
    }

    bool operator==(const Edge& e) const {
        return id == e.id;
    }

};

inline std::ostream& operator<<(std::ostream& os, const Edge& e) {
    os << "edge{id=" << e.id << ", source=" << e.source << ", target=" << e.target << ", type=" << int(e.type) << ", data=" << e.data << "}";
    return os;
}

// Implementations should guarantee that the callbacks are in the specific order: graph, vertex, edge.
struct StreamingGraph {
    virtual ~StreamingGraph() {};
    virtual void process(const Trigger<Graph>&,
                         const Trigger<Vertex>&,
                         const Trigger<Edge>&) = 0;
};

// The following code are for automatic graph format registering
using StreamingGraphCreator = std::function<StreamingGraph*(std::istream&)>;
using GraphFormatMap = std::map<std::string, StreamingGraphCreator>;
extern GraphFormatMap *graph_format_map;

struct GraphFormatRegisterer {
    GraphFormatRegisterer(const char *, StreamingGraphCreator&&);
};

} // namespace streaming
} // namespace sae

#define REGSITER_GRAPH_FORMAT(name, klass) \
    namespace sae { namespace streaming { \
        GraphFormatRegisterer graph_format_registerer_##name(#name, [](std::istream& is) { \
            return new klass(is); \
        }); \
    }}