dd.h

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/* Copyright (c) 2014, 2024, 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.
 
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   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
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   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_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