~drizzle-trunk/drizzle/development

/* 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#ifndef PLUGIN_ARCHIVE_HA_ARCHIVE_H

#define PLUGIN_ARCHIVE_HA_ARCHIVE_H

/*

  Please read ha_archive.cc first. If you are looking for more general

  answers on how storage engines work, look at ha_example.cc and

  ha_example.h.

*/

class ArchiveShare {

public:

  ArchiveShare();

  ArchiveShare(const char *name);

  ~ArchiveShare();

  bool prime(uint64_t *auto_increment);

  std::string table_name;

  std::string data_file_name;

  uint32_t use_count;

  pthread_mutex_t _mutex;

  drizzled::THR_LOCK _lock;

  azio_stream archive_write;     /* Archive file we are working with */

  bool archive_write_open;

  bool dirty;               /* Flag for if a flush should occur */

  bool crashed;             /* Meta file is crashed */

  uint64_t mean_rec_length;

  char real_path[FN_REFLEN];

  uint64_t  version;

  drizzled::ha_rows rows_recorded;    /* Number of rows in tables */

  drizzled::ha_rows version_rows;

  pthread_mutex_t &mutex()

  {

    return _mutex;

  }

};

/*

  Version for file format.

  1 - Initial Version (Never Released)

  2 - Stream Compression, seperate blobs, no packing

  3 - One steam (row and blobs), with packing

*/

#define ARCHIVE_VERSION 3

class ha_archive: public drizzled::Cursor

{

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

  ArchiveShare *share;      /* Shared lock info */

  azio_stream archive;            /* Archive file we are working with */

  drizzled::internal::my_off_t current_position;  /* The position of the row we just read */

  unsigned char byte_buffer[IO_SIZE]; /* Initial buffer for our string */

  drizzled::String buffer;             /* Buffer used for blob storage */

  drizzled::ha_rows scan_rows;         /* Number of rows left in scan */

  bool delayed_insert;       /* If the insert is delayed */

  bool bulk_insert;          /* If we are performing a bulk insert */

  const unsigned char *current_key;

  uint32_t current_key_len;

  uint32_t current_k_offset;

  std::vector <unsigned char> record_buffer;

  bool archive_reader_open;

public:

  ha_archive(drizzled::plugin::StorageEngine &engine_arg,

             drizzled::Table &table_arg);

  ~ha_archive()

  { }

  const char *index_type(uint32_t)

  { return "NONE"; }

  void get_auto_increment(uint64_t, uint64_t, uint64_t,

                          uint64_t *first_value, uint64_t *nb_reserved_values);

  drizzled::ha_rows records() { return share->rows_recorded; }

  int doStartIndexScan(uint32_t keynr, bool sorted);

  virtual int index_read(unsigned char * buf, const unsigned char * key,

			 uint32_t key_len,

                         drizzled::ha_rkey_function find_flag);

  int index_next(unsigned char * buf);

  int doOpen(const drizzled::identifier::Table &identifier, int mode, uint32_t test_if_locked);

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

  int close(void);

  int doInsertRecord(unsigned char * buf);

  int real_write_row(unsigned char *buf, azio_stream *writer);

  int delete_all_rows();

  int doStartTableScan(bool scan=1);

  int rnd_next(unsigned char *buf);

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

  ArchiveShare *get_share(const char *table_name, int *rc);

  int free_share();

  int init_archive_writer();

  int init_archive_reader();

  void position(const unsigned char *record);

  int info(uint);

private:

  int get_row(azio_stream *file_to_read, unsigned char *buf);

  int get_row_version2(azio_stream *file_to_read, unsigned char *buf);

  int get_row_version3(azio_stream *file_to_read, unsigned char *buf);

  int read_data_header(azio_stream *file_to_read);

  int optimize();

  int repair();

public:

  void start_bulk_insert(drizzled::ha_rows rows);

  int end_bulk_insert();

  drizzled::THR_LOCK_DATA **store_lock(drizzled::Session *session,

                                       drizzled::THR_LOCK_DATA **to,

                                       drizzled::thr_lock_type lock_type);

  int check(drizzled::Session* session);

  bool check_and_repair(drizzled::Session *session);

  uint32_t max_row_length(const unsigned char *buf);

  bool fix_rec_buff(unsigned int length);

  int unpack_row(azio_stream *file_to_read, unsigned char *record);

  unsigned int pack_row(unsigned char *record);

};

#endif /* PLUGIN_ARCHIVE_HA_ARCHIVE_H */