lsup_rdf/include/store_mdb.h

/** @file store_mdb.h
 *
 * @brief LMDB graph store backend.
 *
 * This module stores triples in a LMDB embedded store, organized
 * into named graphs. The store is optimized and indexed for fast lookup of any
 * number of bound terms.
 *
 * The store must be first initialized once, to create the environment files
 * and folders as well as the internal databases, then it must be opened once
 * per session. Within that session multiple R/W operations can be performed
 * using transactions.
 *
 * Note that, even though the terms "graph", "context", etc. are used, no code
 * in this module checks for valid RDF data. In theory any term can be any
 * binary data. This allows using the store for non-RDF graph data.
 *
 * TODO more doc
 */


#ifndef _LSUP_STORE_MDB_H
#define _LSUP_STORE_MDB_H

#include "lmdb.h"

#include "buffer.h"
#include "store.h"


// FIXME find a better cross-platform path.
#define DEFAULT_ENV_PATH "./mdb_store"

// RAMdisk path for MDB volatile store.
#define LSUP_MDB_RAMDISK_PATH TMPDIR "/lsup_mem_graph"


extern const LSUP_StoreInt mdbstore_int;       /// MDB store interface.
extern const LSUP_StoreIteratorInt mdbiter_int;  /// MDB iterator interface.

#endif  /* _LSUP_STORE_MDB_H */