connection_control_interfaces.h

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/* Copyright (c) 2024, 2025, 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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   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
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   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
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef CONNECTION_CONTROL_INTERFACES_H
#define CONNECTION_CONTROL_INTERFACES_H
 
#include <string> /* std::string */
#include <vector> /* std::vector */
#include "connection_control.h"
#include "connection_control_data.h" /* Variables and Status */
 
namespace connection_control {
/* Typedefs for convenience */
typedef std::string Sql_string;
 
/* Forward declaration */
class Connection_event_coordinator;
 
/**
  Interface for defining action on connection events
*/
class Connection_event_observer {
 public:
  virtual bool notify_event(
      MYSQL_THD thd, Connection_event_coordinator *coordinator,
      const mysql_event_tracking_connection_data *connection_event) = 0;
  virtual bool notify_sys_var(Connection_event_coordinator *coordinator,
                              opt_connection_control variable,
                              void *new_value) = 0;
  virtual ~Connection_event_observer() = default;
};
 
/* Status variable action enum */
typedef enum status_var_action {
  ACTION_NONE = 0,
  ACTION_INC,
  ACTION_RESET,
  ACTION_LAST /* Must be at the end */
} status_var_action;
}  // namespace connection_control
#endif  // !CONNECTION_CONTROL_INTERFACES_H