glass_changes.h

Go to the documentation of this file.

 
/* Copyright 2014 Olly Betts
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <https://www.gnu.org/licenses/>.
 */
 
#ifndef XAPIAN_INCLUDED_GLASS_CHANGES_H
#define XAPIAN_INCLUDED_GLASS_CHANGES_H
 
#include "glass_defs.h"
#include <string>
 
class GlassChanges {
    int changes_fd;
 
    std::string changes_stem;
 
    glass_revision_number_t max_changesets;
 
    glass_revision_number_t oldest_changeset;
 
  public:
    explicit GlassChanges(const std::string & db_dir)
        : changes_fd(-1),
          changes_stem(db_dir + "/changes"),
          oldest_changeset(0) { }
 
    ~GlassChanges();
 
    GlassChanges * start(glass_revision_number_t old_rev,
                         glass_revision_number_t rev,
                         int flags);
 
    void write_block(const char * p, size_t len);
 
    void write_block(const std::string & s) {
        write_block(s.data(), s.size());
    }
 
    void set_oldest_changeset(glass_revision_number_t rev) {
        oldest_changeset = rev;
    }
 
    glass_revision_number_t get_oldest_changeset() const {
        return oldest_changeset;
    }
 
    void commit(glass_revision_number_t new_rev, int flags);
 
    static void check(const std::string & changes_file);
};
 
#endif // XAPIAN_INCLUDED_GLASS_CHANGES_H