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/* Copyright (C) 2003 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef PLUGIN_CSV_HA_TINA_H
#define PLUGIN_CSV_HA_TINA_H
#include <drizzled/cursor.h>
#include <drizzled/thr_lock.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "transparent_file.h"
#define DEFAULT_CHAIN_LENGTH 512
/*
Version for file format.
1 - Initial Version. That is, the version when the metafile was introduced.
*/
#define TINA_VERSION 1
class TinaShare
{
TinaShare();
TinaShare(const TinaShare &);
TinaShare& operator=(const TinaShare &);
public:
explicit TinaShare(const char *name);
~TinaShare();
std::string table_name;
char data_file_name[FN_REFLEN];
uint32_t use_count;
/*
Here we save the length of the file for readers. This is updated by
inserts, updates and deletes. The var is initialized along with the
share initialization.
*/
off_t saved_data_file_length;
pthread_mutex_t mutex;
drizzled::THR_LOCK lock;
bool update_file_opened;
bool tina_write_opened;
int meta_file; /* Meta file we use */
int tina_write_filedes; /* File Cursor for readers */
bool crashed; /* Meta file is crashed */
drizzled::ha_rows rows_recorded; /* Number of rows in tables */
uint32_t data_file_version; /* Version of the data file used */
};
struct tina_set {
off_t begin;
off_t end;
};
class ha_tina: public drizzled::Cursor
{
drizzled::THR_LOCK_DATA lock; /* MySQL lock */
TinaShare *share; /* Shared lock info */
off_t current_position; /* Current position in the file during a file scan */
off_t next_position; /* Next position in the file scan */
off_t local_saved_data_file_length; /* save position for reads */
off_t temp_file_length;
unsigned char byte_buffer[IO_SIZE];
Transparent_file *file_buff;
int data_file; /* File Cursor for readers */
int update_temp_file;
drizzled::String buffer;
/*
The chain contains "holes" in the file, occured because of
deletes/updates. It is used in rnd_end() to get rid of them
in the end of the query.
*/
tina_set chain_buffer[DEFAULT_CHAIN_LENGTH];
tina_set *chain;
tina_set *chain_ptr;
unsigned char chain_alloced;
uint32_t chain_size;
uint32_t local_data_file_version; /* Saved version of the data file used */
bool records_is_known;
drizzled::memory::Root blobroot;
bool get_write_pos(off_t *end_pos, tina_set *closest_hole);
int open_update_temp_file_if_needed();
int init_tina_writer();
int init_data_file();
public:
ha_tina(drizzled::plugin::StorageEngine &engine, drizzled::TableShare &table_arg);
~ha_tina()
{
if (chain_alloced)
free(chain);
if (file_buff)
delete file_buff;
}
const char *table_type(void) const { return "CSV"; }
const char *index_type(uint32_t)
{ return "NONE"; }
/*
Called in test_quick_select to determine if indexes should be used.
*/
virtual double scan_time() { return (double) (stats.records+stats.deleted) / 20.0+10; }
/* The next method will never be called */
virtual bool fast_key_read() { return 1;}
/*
TODO: return actual upper bound of number of records in the table.
(e.g. save number of records seen on full table scan and/or use file size
as upper bound)
*/
drizzled::ha_rows estimate_rows_upper_bound() { return HA_POS_ERROR; }
int open(const char *name, int mode, uint32_t open_options);
int close(void);
int write_row(unsigned char * buf);
int update_row(const unsigned char * old_data, unsigned char * new_data);
int delete_row(const unsigned char * buf);
int rnd_init(bool scan=1);
int rnd_next(unsigned char *buf);
int rnd_pos(unsigned char * buf, unsigned char *pos);
int rnd_end();
TinaShare *get_share(const char *table_name);
int free_share();
int repair(drizzled::Session* session, drizzled::HA_CHECK_OPT* check_opt);
/* This is required for SQL layer to know that we support autorepair */
void position(const unsigned char *record);
int info(uint);
int delete_all_rows(void);
/*
These functions used to get/update status of the Cursor.
Needed to enable concurrent inserts.
*/
void get_status();
void update_status();
/* The following methods were added just for TINA */
int encode_quote(unsigned char *buf);
int find_current_row(unsigned char *buf);
int chain_append();
};
#endif /* PLUGIN_CSV_HA_TINA_H */
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