datastore.h

// Percy++ Copyright 2007,2012,2013,2014
// Ian Goldberg <iang@cs.uwaterloo.ca>,
// Casey Devet <cjdevet@uwaterloo.ca>,
// Ryan Henry <rhenry@cs.uwaterloo.ca>
// 
// This program is free software; you can redistribute it and/or modify
// it under the terms of version 2 of the GNU General Public License as
// published by the Free Software Foundation.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// There is a copy of the GNU General Public License in the COPYING file
// packaged with this plugin; if you cannot find it, write to the Free
// Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301 USA

#ifndef __DATASTORE_H__
#define __DATASTORE_H__
#include <ZZ.h>
#include <NTL/mat_ZZ_p.h>
#include <set>
#include <map>
#include <vector>
#include "percyparams.h"

NTL_CLIENT


class DataStore {
private:
    unsigned char *database;

protected:
    const PercyServerParams * serverparams;
    const PercyParams * params;
    dbsize_t block_size;
    dbsize_t num_blocks;
    dbsize_t database_size;

    // Distributed computation stuff
    nservers_t num_workers;
    std::vector<dbsize_t> subdb_offsets;
    std::vector<DataStore*> subdatastores;

public:
    DataStore (unsigned char * database, const PercyServerParams * params);

    virtual ~DataStore ();

    const unsigned char *get_data() const {return database;}

    void set_database (unsigned char * data = NULL);

    vector<DataStore*> get_worker_datastores () const { 
    return subdatastores;
    }
    DataStore * get_worker_datastore (nservers_t worker_index) const {
    return (worker_index < num_workers ? subdatastores[worker_index] : NULL);
    }
};



class FileDataStore : public DataStore {
private:
    int dbfd;
    unsigned char *mapptr;
    dboffset_t map_offset;

public:
    FileDataStore(const char *filename, const PercyServerParams * params,
        dboffset_t offset = 0);

    virtual ~FileDataStore();
};

#endif