events.h

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#ifndef _EVENT_H_
#define _EVENT_H_
/* Copyright (c) 2004, 2013, 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 02110-1301  USA */

#ifdef HAVE_PSI_INTERFACE
extern PSI_mutex_key key_event_scheduler_LOCK_scheduler_state;
extern PSI_cond_key key_event_scheduler_COND_state;
extern PSI_thread_key key_thread_event_scheduler, key_thread_event_worker;
#endif /* HAVE_PSI_INTERFACE */

/* Always defined, for SHOW PROCESSLIST. */
extern PSI_stage_info stage_waiting_on_empty_queue;
extern PSI_stage_info stage_waiting_for_next_activation;
extern PSI_stage_info stage_waiting_for_scheduler_to_stop;

#include "sql_string.h"                         /* LEX_STRING */
#include "my_time.h"                            /* interval_type */

class Event_db_repository;
class Event_parse_data;
class Event_queue;
class Event_scheduler;
struct TABLE_LIST;
class THD;
typedef struct charset_info_st CHARSET_INFO;

int
sortcmp_lex_string(LEX_STRING s, LEX_STRING t, CHARSET_INFO *cs);

class Events
{
public:
  /*
    the following block is to support --event-scheduler command line option
    and the @@global.event_scheduler SQL variable.
    See sys_var.cc
  */
  enum enum_opt_event_scheduler { EVENTS_OFF, EVENTS_ON, EVENTS_DISABLED };
  /* Protected using LOCK_global_system_variables only. */
  static ulong opt_event_scheduler;
  static bool check_if_system_tables_error();
  static bool start(int *err_no);
  static bool stop();

public:
  /* A hack needed for Event_queue_element */
  static Event_db_repository *
  get_db_repository() { return db_repository; }

  static bool
  init(my_bool opt_noacl);

  static void
  deinit();

  static void
  init_mutexes();

  static void
  destroy_mutexes();

  static bool
  create_event(THD *thd, Event_parse_data *parse_data, bool if_exists);

  static bool
  update_event(THD *thd, Event_parse_data *parse_data,
               LEX_STRING *new_dbname, LEX_STRING *new_name);

  static bool
  drop_event(THD *thd, LEX_STRING dbname, LEX_STRING name, bool if_exists);

  static void
  drop_schema_events(THD *thd, char *db);

  static bool
  show_create_event(THD *thd, LEX_STRING dbname, LEX_STRING name);

  /* Needed for both SHOW CREATE EVENT and INFORMATION_SCHEMA */
  static int
  reconstruct_interval_expression(String *buf, interval_type interval,
                                  longlong expression);

  static int
  fill_schema_events(THD *thd, TABLE_LIST *tables, Item * /* cond */);

  static void
  dump_internal_status();

private:

  static bool
  load_events_from_db(THD *thd);

private:
  static Event_queue         *event_queue;
  static Event_scheduler     *scheduler;
  static Event_db_repository *db_repository;
  /* Set to TRUE if an error at start up */
  static bool check_system_tables_error;

private:
  /* Prevent use of these */
  Events(const Events &);
  void operator=(Events &);
};

#endif /* _EVENT_H_ */