replication.h

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/* Copyright 2008 Lemur Consulting Ltd
 * Copyright 2008,2011,2015,2016 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

#ifndef XAPIAN_INCLUDED_REPLICATION_H
#define XAPIAN_INCLUDED_REPLICATION_H

#include "xapian/visibility.h"

#include <string>

namespace Xapian {

struct ReplicationInfo {
    int changeset_count;

    int fullcopy_count;

    bool changed;

    ReplicationInfo()
        : changeset_count(0),
          fullcopy_count(0),
          changed(false)
    {}

    void clear() {
        changeset_count = 0;
        fullcopy_count = 0;
        changed = false;
    }
};

class XAPIAN_VISIBILITY_DEFAULT DatabaseMaster {
    std::string path;

  public:
    explicit DatabaseMaster(const std::string & path_) : path(path_) {}

    void write_changesets_to_fd(int fd,
                                const std::string & start_revision,
                                ReplicationInfo * info) const;

    std::string get_description() const;
};

class XAPIAN_VISIBILITY_DEFAULT DatabaseReplica {
    class Internal;
    Internal * internal;

    DatabaseReplica(const DatabaseReplica & other);

    void operator=(const DatabaseReplica & other);

  public:
    ~DatabaseReplica();

    explicit DatabaseReplica(const std::string & path);

    std::string get_revision_info() const;

    void set_read_fd(int fd);

    bool apply_next_changeset(ReplicationInfo * info,
                              double reader_close_time);

    std::string get_description() const;
};

}

#endif /* XAPIAN_INCLUDED_REPLICATION_H */