~drizzle-trunk/drizzle/development

/* Copyright (C) 2005 MySQL AB

  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; version 2 of the License.

  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 PLUGIN_BLACKHOLE_HA_BLACKHOLE_H

#define PLUGIN_BLACKHOLE_HA_BLACKHOLE_H

#include <drizzled/cursor.h>

#include <drizzled/thr_lock.h>

#define BLACKHOLE_MAX_KEY	64		/* Max allowed keys */

#define BLACKHOLE_MAX_KEY_LENGTH 1000

/*

  Shared structure for correct LOCK operation

*/

class BlackholeShare

{

  BlackholeShare();

  BlackholeShare(const BlackholeShare &);

  BlackholeShare& operator=(const BlackholeShare &);

public:

  explicit BlackholeShare(const std::string table_name_arg);

  ~BlackholeShare();

  drizzled::THR_LOCK lock;

  uint32_t use_count;

  const std::string table_name;

};

/*

  Class definition for the blackhole storage engine

  "Dumbest named feature ever"

*/

class ha_blackhole: public drizzled::Cursor

{

  drizzled::THR_LOCK_DATA lock;      /* MySQL lock */

  BlackholeShare *share;

public:

  ha_blackhole(drizzled::plugin::StorageEngine &engine,

               drizzled::Table &table_arg);

  ~ha_blackhole()

  {}

  /*

    The name of the index type that will be used for display

    don't implement this method unless you really have indexes

  */

  const char *index_type(uint32_t key_number);

  uint32_t index_flags(uint32_t inx) const;

  int open(const char *name, int mode, uint32_t test_if_locked);

  int close(void);

  int doInsertRecord(unsigned char * buf);

  int doStartTableScan(bool scan);

  int rnd_next(unsigned char *buf);

  int rnd_pos(unsigned char * buf, unsigned char *pos);

  BlackholeShare *get_share(const char *table_name);

  void free_share();

  int index_read_map(unsigned char * buf, const unsigned char * key,

                     drizzled::key_part_map keypart_map,

                     drizzled::ha_rkey_function find_flag);

  int index_read_idx_map(unsigned char * buf, uint32_t idx, const unsigned char * key,

                         drizzled::key_part_map keypart_map,

                         drizzled::ha_rkey_function find_flag);

  int index_read_last_map(unsigned char * buf, const unsigned char * key,

                          drizzled::key_part_map keypart_map);

  int index_next(unsigned char * buf);

  int index_prev(unsigned char * buf);

  int index_first(unsigned char * buf);

  int index_last(unsigned char * buf);

  void position(const unsigned char *record);

  int info(uint32_t flag);

  void get_auto_increment(uint64_t, uint64_t,

                          uint64_t,

                          uint64_t *,

                          uint64_t *)

  {}

};

#endif /* PLUGIN_BLACKHOLE_HA_BLACKHOLE_H */