dd.h

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/* Copyright (c) 2014, 2023, Oracle and/or its affiliates.
 
   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__DD_INCLUDED
#define DD__DD_INCLUDED
 
namespace dd {
 
///////////////////////////////////////////////////////////////////////////
 
// enum type to pass to init() function.
enum class enum_dd_init_type {
  DD_INITIALIZE = 1,
  DD_INITIALIZE_SYSTEM_VIEWS,
  DD_RESTART_OR_UPGRADE,
  DD_POPULATE_UPGRADE,
  DD_DELETE,
  DD_UPDATE_I_S_METADATA,
  DD_INITIALIZE_NON_DD_BASED_SYSTEM_VIEWS
};
 
/**
  Initialize data dictionary upon server startup, server startup on old
  data directory or install data dictionary for the first time.
 
  @param dd_init - Option for initialization, population or deletion
                   of data dictionary.
 
  @return false - On success
  @return true - On error
*/
bool init(enum_dd_init_type dd_init);
 
/**
  Shuts down the data dictionary instance by deleting
  the instance of dd::Dictionary_impl* upon server shutdown.
 
  @return false - On success
  @return true - If invoked when data dictionary instance
                 is not yet initialized.
*/
bool shutdown();
 
/**
  Get the data dictionary instance.
 
  @returns 'Dictionary*' pointer to data dictionary instance.
           Else returns NULL if data dictionary is not
           initialized.
*/
class Dictionary *get_dictionary();
 
/**
  Create a instance of data dictionary object of type X.
  E.g., X could be 'dd::Table', 'dd::View' and etc.
 
  @returns Pointer to the newly allocated dictionary object.
*/
template <typename X>
X *create_object();
 
///////////////////////////////////////////////////////////////////////////
 
}  // namespace dd
 
#endif  // DD__DD_INCLUDED