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Edit File : rpl_tblmap.h \| Size : 3.10 KB
/* 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 / #ifndef TABLE_MAPPING_H #define TABLE_MAPPING_H / Forward declarations / #ifndef MYSQL_CLIENT struct TABLE; #else class Table_map_log_event; typedef Table_map_log_event TABLE; void free_table_map_log_event(TABLE table); #endif /* CLASS table_mapping RESPONSIBILITIES The table mapping is used to map table id's to table pointers COLLABORATION RELAY_LOG For mapping table id:s to tables when receiving events. / / Guilhem to Mats: in the table_mapping class, the memory is allocated and never freed (until destruction). So this is a good candidate for allocating inside a MEM_ROOT: it gives the efficient allocation in chunks (like in expand()). So I have introduced a MEM_ROOT. Note that inheriting from Sql_alloc had no effect: it has effects only when "ptr= new table_mapping" is called, and this is never called. And it would then allocate from thd->mem_root which is a highly volatile object (reset from example after executing each query, see dispatch_command(), it has a free_root() at end); as the table_mapping object is supposed to live longer than a query, it was dangerous. A dedicated MEM_ROOT needs to be used, see below. / #include "hash.h" / HASH / class table_mapping { private: MEM_ROOT m_mem_root; public: enum enum_error { ERR_NO_ERROR = 0, ERR_LIMIT_EXCEEDED, ERR_MEMORY_ALLOCATION }; table_mapping(); ~table_mapping(); TABLE get_table(ulonglong table_id); int set_table(ulonglong table_id, TABLE* table); int remove_table(ulonglong table_id); void clear_tables(); ulong count() const { return m_table_ids.records; } private: /* This is a POD (Plain Old Data). Keep it that way (we apply offsetof() to it, which only works for PODs) / struct entry { ulonglong table_id; union { TABLE table; entry next; }; }; entry find_entry(ulonglong table_id) { return (entry ) my_hash_search(&m_table_ids, (uchar)&table_id, sizeof(table_id)); } int expand(); /* Head of the list of free entries; "free" in the sense that it's an allocated entry free for use, NOT in the sense that it's freed memory. / entry m_free; /* Correspondance between an id (a number) and a TABLE object */ HASH m_table_ids; }; #endif Back

Edit File : rpl_tblmap.h | Size : 3.10 KB

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 */

#ifndef TABLE_MAPPING_H
#define TABLE_MAPPING_H

/* Forward declarations */
#ifndef MYSQL_CLIENT
struct TABLE;
#else
class Table_map_log_event;
typedef Table_map_log_event TABLE;
void free_table_map_log_event(TABLE *table);
#endif

/*
  CLASS table_mapping

RESPONSIBILITIES
    The table mapping is used to map table id's to table pointers

COLLABORATION
    RELAY_LOG    For mapping table id:s to tables when receiving events.
 */

/*
  Guilhem to Mats:
  in the table_mapping class, the memory is allocated and never freed (until
  destruction). So this is a good candidate for allocating inside a MEM_ROOT:
  it gives the efficient allocation in chunks (like in expand()). So I have
  introduced a MEM_ROOT.

Note that inheriting from Sql_alloc had no effect: it has effects only when
  "ptr= new table_mapping" is called, and this is never called. And it would
  then allocate from thd->mem_root which is a highly volatile object (reset
  from example after executing each query, see dispatch_command(), it has a
  free_root() at end); as the table_mapping object is supposed to live longer
  than a query, it was dangerous.
  A dedicated MEM_ROOT needs to be used, see below.
*/

#include "hash.h"                               /* HASH */

class table_mapping {

private:
  MEM_ROOT m_mem_root;

public:

enum enum_error {
      ERR_NO_ERROR = 0,
      ERR_LIMIT_EXCEEDED,
      ERR_MEMORY_ALLOCATION
  };

table_mapping();
  ~table_mapping();

TABLE* get_table(ulonglong table_id);

int       set_table(ulonglong table_id, TABLE* table);
  int       remove_table(ulonglong table_id);
  void      clear_tables();
  ulong     count() const { return m_table_ids.records; }

private:
  /*
    This is a POD (Plain Old Data).  Keep it that way (we apply offsetof() to
    it, which only works for PODs)
  */
  struct entry { 
    ulonglong table_id;
    union {
      TABLE *table;
      entry *next;
    };
  };

entry *find_entry(ulonglong table_id)
  {
    return (entry *) my_hash_search(&m_table_ids,
                                    (uchar*)&table_id,
                                    sizeof(table_id));
  }
  int expand();

/*
    Head of the list of free entries; "free" in the sense that it's an
    allocated entry free for use, NOT in the sense that it's freed
    memory.
  */
  entry *m_free;

/* Correspondance between an id (a number) and a TABLE object */
  HASH m_table_ids;
};

#endif

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