transaction_impl.h

/* Copyright (c) 2014, 2017, 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, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 DD__TRANSACTION_IMPL_INCLUDED
#define DD__TRANSACTION_IMPL_INCLUDED

#include <sys/types.h>
#include <map>

#include "my_inttypes.h"
#include "mysql/udf_registration_types.h"
#include "sql/dd/dd_kill_immunizer.h"  // dd::DD_kill_immunizer
#include "sql/dd/impl/types/abstract_table_impl.h"
#include "sql/dd/impl/types/charset_impl.h"
#include "sql/dd/impl/types/collation_impl.h"
#include "sql/dd/impl/types/column_impl.h"
#include "sql/dd/impl/types/column_statistics_impl.h"
#include "sql/dd/impl/types/event_impl.h"
#include "sql/dd/impl/types/foreign_key_impl.h"
#include "sql/dd/impl/types/function_impl.h"
#include "sql/dd/impl/types/index_stat_impl.h"
#include "sql/dd/impl/types/parameter_impl.h"
#include "sql/dd/impl/types/partition_impl.h"
#include "sql/dd/impl/types/procedure_impl.h"
#include "sql/dd/impl/types/resource_group_impl.h"
#include "sql/dd/impl/types/routine_impl.h"
#include "sql/dd/impl/types/schema_impl.h"
#include "sql/dd/impl/types/spatial_reference_system_impl.h"
#include "sql/dd/impl/types/table_impl.h"
#include "sql/dd/impl/types/table_stat_impl.h"
#include "sql/dd/impl/types/tablespace_impl.h"
#include "sql/dd/impl/types/trigger_impl.h"
#include "sql/dd/impl/types/view_impl.h"
#include "sql/dd/impl/types/view_routine_impl.h"
#include "sql/dd/impl/types/view_table_impl.h"
#include "sql/dd/string_type.h"  // dd::String_type
#include "sql/discrete_interval.h"
#include "sql/field.h"
#include "sql/handler.h"
#include "sql/set_var.h"
#include "sql/sql_class.h"  // THD::killed_state
#include "thr_lock.h"

struct LEX;

namespace dd {

class Raw_table;

///////////////////////////////////////////////////////////////////////////

/**
  Auxiliary class for opening dictionary tables.
*/
class Open_dictionary_tables_ctx {
 public:
  Open_dictionary_tables_ctx(THD *thd, thr_lock_type lock_type)
      : m_thd(thd), m_lock_type(lock_type), m_ignore_global_read_lock(false) {}

  ~Open_dictionary_tables_ctx();

  Raw_table *get_table(const String_type &name) const;

  template <typename T>
  Raw_table *get_table() const {
    return get_table(T::DD_table::instance().name());
  }

  template <typename X>
  void register_tables() {
    X::Impl::register_tables(this);
  }

  template <typename X>
  void add_table() {
    this->add_table(X::instance().name());
  }

  /**
    Open all the DD tables in list Open_dictionary_tables_ctx::m_tables.

    @return true - On failure and error is reported.
    @return false - On success.
  */
  bool open_tables();

  void add_table(const String_type &name);

  THD *get_thd() const { return m_thd; }

  /**
    Ignore global read lock when opening the tables.

    @returns void.
  */
  void mark_ignore_global_read_lock() {
    if (m_lock_type == TL_WRITE) m_ignore_global_read_lock = true;
  }

 private:
  THD *m_thd;
  thr_lock_type m_lock_type;
  bool m_ignore_global_read_lock;
  typedef std::map<String_type, Raw_table *> Object_table_map;
  Object_table_map m_tables;
};

/**
  Implementation of read-only data-dictionary transaction.
  Relies on attachable transactions infrastructure.
*/
class Transaction_ro {
 public:
  Transaction_ro(THD *thd, enum_tx_isolation isolation)
      : otx(thd, TL_READ), m_thd(thd), m_kill_immunizer(thd) {
    thd->begin_attachable_ro_transaction();
    thd->tx_isolation = isolation;
  }

  ~Transaction_ro() { m_thd->end_attachable_transaction(); }

  Open_dictionary_tables_ctx otx;

 private:
  THD *m_thd;

  DD_kill_immunizer m_kill_immunizer;
};

///////////////////////////////////////////////////////////////////////////

/**
  Class for storing/restoring state during dictionary update operations.
*/
class Update_dictionary_tables_ctx {
 public:
  Update_dictionary_tables_ctx(THD *thd);

  ~Update_dictionary_tables_ctx();

  Open_dictionary_tables_ctx otx;

 private:
  THD *m_thd;

  DD_kill_immunizer m_kill_immunizer;

  LEX *m_lex_saved;

  // Stores state before DD operations
  Open_tables_backup m_open_tables_state_backup;
  bool m_saved_binlog_row_based;
  ulonglong m_saved_options;
  sql_mode_t m_saved_mode;
  long long m_latest_auto_incr_id;
  enum_check_fields m_saved_check_for_truncated_fields;
  uint m_saved_in_sub_stmt;
  bool m_saved_time_zone_used;

  /*
    Save auto_increment_increment state.

    Value of the auto_increment_increment is set to 1 in the constructor.
    auto_increment_offset is used only when auto_increment_increment is greater
    than 1. So saving only auto_increment_increment value.
  */
  ulong m_saved_auto_increment_increment;

  // Save auto_inc_intervals_in_cur_stmt_for_binlog
  Discrete_intervals_list m_auto_inc_intervals_in_cur_stmt_for_binlog_saved;

  Discrete_intervals_list m_auto_inc_intervals_forced_saved;
};

///////////////////////////////////////////////////////////////////////////

}  // namespace dd

#endif  // DD__TRANSACTION_IMPL_INCLUDED