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/* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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 02110-1335 USA */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
#include "thr_lock.h" /* THR_LOCK */
#include "handler.h" /* handler */
#include "table.h" /* TABLE_SHARE */
/*
Shared structure for correct LOCK operation
*/
struct st_blackhole_share {
THR_LOCK lock;
uint use_count;
uint table_name_length;
char table_name[1];
};
/*
Class definition for the blackhole storage engine
"Dumbest named feature ever"
*/
class ha_blackhole: public handler
{
THR_LOCK_DATA lock; /* MySQL lock */
st_blackhole_share *share;
public:
ha_blackhole(handlerton *hton, TABLE_SHARE *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(uint key_number);
ulonglong table_flags() const
{
return(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
HA_BINLOG_STMT_CAPABLE | HA_BINLOG_ROW_CAPABLE |
HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY | HA_CAN_ONLINE_BACKUPS |
HA_FILE_BASED | HA_CAN_GEOMETRY | HA_CAN_INSERT_DELAYED);
}
ulong index_flags(uint inx, uint part, bool all_parts) const
{
return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ?
0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
HA_READ_ORDER | HA_KEYREAD_ONLY);
}
/* The following defines can be increased if necessary */
#define BLACKHOLE_MAX_KEY 64 /* Max allowed keys */
#define BLACKHOLE_MAX_KEY_SEG 16 /* Max segments for key */
#define BLACKHOLE_MAX_KEY_LENGTH 1000
uint max_supported_keys() const { return BLACKHOLE_MAX_KEY; }
uint max_supported_key_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
uint max_supported_key_part_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
int open(const char *name, int mode, uint test_if_locked);
int close(void);
int truncate();
int rnd_init(bool scan);
int rnd_next(uchar *buf);
int rnd_pos(uchar * buf, uchar *pos);
int index_read_map(uchar * buf, const uchar * key, key_part_map keypart_map,
enum ha_rkey_function find_flag);
int index_read_idx_map(uchar * buf, uint idx, const uchar * key,
key_part_map keypart_map,
enum ha_rkey_function find_flag);
int index_read_last_map(uchar * buf, const uchar * key, key_part_map keypart_map);
int index_next(uchar * buf);
int index_prev(uchar * buf);
int index_first(uchar * buf);
int index_last(uchar * buf);
void position(const uchar *record);
int info(uint flag);
int external_lock(THD *thd, int lock_type);
int create(const char *name, TABLE *table_arg,
HA_CREATE_INFO *create_info);
THR_LOCK_DATA **store_lock(THD *thd,
THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
private:
virtual int write_row(uchar *buf);
virtual int update_row(const uchar *old_data, const uchar *new_data);
virtual int delete_row(const uchar *buf);
};
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