104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
/* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef CONNECTION_CONTROL_INTERFACES_H
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#define CONNECTION_CONTROL_INTERFACES_H
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#include <mysql/plugin_audit.h> /* mysql_event_connection */
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#include "connection_control_data.h" /* Variables and Status */
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#include <vector> /* std::vector */
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#include <string> /* std::string */
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namespace connection_control
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{
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/* Typedefs for convenience */
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typedef std::string Sql_string;
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/* Forward declarations */
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class Connection_event_coordinator_services;
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class Error_handler
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{
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public:
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virtual void handle_error(const char * error_message)= 0;
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virtual ~Error_handler() {}
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};
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/**
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Interface for recording connection events
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*/
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class Connection_event_records
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{
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public:
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virtual bool create_or_update_entry(const Sql_string &s)= 0;
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virtual bool remove_entry(const Sql_string &s)= 0;
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virtual bool match_entry(const Sql_string &s, void *value)= 0;
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virtual void reset_all()= 0;
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virtual ~Connection_event_records()
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{ /* Emptiness! */ }
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};
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/**
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Interface for defining action on connection events
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*/
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class Connection_event_observer
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{
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public:
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virtual bool notify_event(MYSQL_THD thd,
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Connection_event_coordinator_services *coordinator,
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const mysql_event_connection *connection_event,
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Error_handler *error_handler)= 0;
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virtual bool notify_sys_var(Connection_event_coordinator_services *coordinator,
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opt_connection_control variable,
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void *new_value,
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Error_handler *error_handler)= 0;
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virtual ~Connection_event_observer()
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{ /* Nothing to see here! */ }
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};
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/* Status variable action enum */
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typedef enum status_var_action
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{
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ACTION_NONE=0,
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ACTION_INC,
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ACTION_RESET,
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ACTION_LAST /* Must be at the end */
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}status_var_action;
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/**
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Interface to provide service to observers
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*/
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class Connection_event_coordinator_services
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{
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public:
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virtual bool notify_status_var(Connection_event_observer **observer,
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stats_connection_control status_var,
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status_var_action action)= 0;
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virtual bool register_event_subscriber(Connection_event_observer **subscriber,
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std::vector<opt_connection_control> *sys_vars,
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std::vector<stats_connection_control> *status_vars)= 0;
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virtual ~Connection_event_coordinator_services()
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{ /* go away */ }
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};
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}
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#endif // !CONNECTION_CONTROL_INTERFACES_H
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