/** @file
 * @brief Support for glass database replication
 */
/* Copyright 2008 Lemur Consulting Ltd
 * Copyright 2009,2010,2011,2014 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_DATABASEREPLICATOR_H
#define XAPIAN_INCLUDED_GLASS_DATABASEREPLICATOR_H

#include "backends/databasereplicator.h"
#include "glass_defs.h"

class GlassDatabaseReplicator : public Xapian::DatabaseReplicator {
    /** Path of database.
     */
    std::string db_dir;

    /** File descriptors for writing to each table.
     *
     *  The corresponding entry is -1 if that table is not yet opened.
     */
    mutable int fds[Glass::MAX_];

    /** Process a chunk which holds a version file.
     */
    void process_changeset_chunk_version(std::string & buf,
                                         RemoteConnection & conn,
                                         double end_time) const;

    /** Process a chunk which holds a list of changed blocks in the
     *  database.
     */
    void process_changeset_chunk_blocks(Glass::table_type table,
                                        unsigned v,
                                        std::string & buf,
                                        RemoteConnection & conn,
                                        double end_time) const;

    void commit() const;

  public:
    explicit GlassDatabaseReplicator(const std::string & db_dir_);

    ~GlassDatabaseReplicator();

    /** Virtual methods of DatabaseReplicator. */
    //@{
    bool check_revision_at_least(const std::string & rev,
                                 const std::string & target) const;
    std::string apply_changeset_from_conn(RemoteConnection & conn,
                                          double end_time,
                                          bool valid) const;
    std::string get_uuid() const;
    //@}
};

#endif /* XAPIAN_INCLUDED_GLASS_DATABASEREPLICATOR_H */
