113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
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#pragma once
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#include "data_structures/concurrent/skiplist.hpp"
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#include "database/db_transaction.hpp"
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#include "snapshot/snapshot_engine.hpp"
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#include "storage/garbage/garbage.hpp"
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#include "transactions/engine.hpp"
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#include "mvcc/version_list.hpp"
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#include "utils/pass_key.hpp"
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// forward declaring Edge and Vertex because they use
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// GraphDb::Label etc., and therefore include this header
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class Vertex;
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class VertexAccessor;
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class Edge;
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class EdgeAccessor;
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// TODO: Maybe split this in another layer between Db and Dbms. Where the new
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// layer would hold SnapshotEngine and his kind of concept objects. Some
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// guidelines would be: retain objects which are necessary to implement querys
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// in Db, the rest can be moved to the new layer.
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/**
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* Main class which represents Database concept in code.
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*/
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class GraphDb {
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public:
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using sptr = std::shared_ptr<GraphDb>;
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// definitions for what data types are used for a Label, Property, EdgeType
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using Label = uint32_t;
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using EdgeType = uint32_t;
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using Property = uint32_t;
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/**
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* This constructor will create a database with the name "default"
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*
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* NOTE: explicit is here to prevent compiler from evaluating const char *
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* into a bool.
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*
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* @param import_snapshot will in constructor import latest snapshot
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* into the db.
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*/
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explicit GraphDb(bool import_snapshot = true);
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/**
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* Construct database with a custom name.
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*
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* @param name database name
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* @param import_snapshot will in constructor import latest snapshot
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* into the db.
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*/
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GraphDb(const char *name, bool import_snapshot = true);
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/**
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* Construct database with a custom name.
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*
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* @param name database name
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* @param import_snapshot will in constructor import latest snapshot
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* into the db.
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*/
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GraphDb(const std::string &name, bool import_snapshot = true);
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/**
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* Database object can't be copied.
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*/
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GraphDb(const GraphDb &db) = delete;
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/**
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* Creates a new Vertex and returns an accessor to it.
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*
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* @param db_trans The transaction that is creating a vertex.
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* @return See above.
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*/
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VertexAccesor insert_vertex(DbTransaction& db_trans);
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/**
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* Creates a new Edge and returns an accessor to it.
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*
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* @param db_trans The transaction that is creating an Edge.
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* @param from The 'from' vertex.
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* @param to The 'to' vertex'
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* @param type Edge type.
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* @return An accessor to the edge.
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*/
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EdgeAccessor insert_edge(DbTransaction& db_trans, VertexAccessor& from,
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VertexAccessor& to, EdgeType type);
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/** transaction engine related to this database */
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tx::Engine tx_engine;
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/** garbage collector related to this database*/
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// TODO bring back garbage collection
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// Garbage garbage = {tx_engine};
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// TODO bring back shapshot engine
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// SnapshotEngine snap_engine = {*this};
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// database name
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const std::string name_;
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private:
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// main storage for the graph
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SkipList<mvcc::VersionList<Edge>*> edges_;
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SkipList<mvcc::VersionList<Vertex>*> vertices_;
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// utility stuff
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const PassKey<GraphDb> pass_key;
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};
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