127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
#ifndef _MONITOR_H
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#define _MONITOR_H
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/*
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* This file is distributed as part of the MariaDB Corporation MaxScale. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright MariaDB Corporation Ab 2013-2014
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*/
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#include <server.h>
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#include <dcb.h>
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/**
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* @file monitor.h The interface to the monitor module
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 07/07/13 Mark Riddoch Initial implementation
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* 25/07/13 Mark Riddoch Addition of diagnotics
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* 23/05/14 Mark Riddoch Addition of routine to find monitors by name
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* 23/05/14 Massimiliano Pinto Addition of defaultId and setInterval
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* 23/06/14 Massimiliano Pinto Addition of replicationHeartbeat
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* 28/08/14 Massimiliano Pinto Addition of detectStaleMaster
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*
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* @endverbatim
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*/
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/**
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* The "Module Object" for a monitor module.
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*
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* The monitor modules are designed to monitor the backend databases that the gateway
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* connects to and provide information regarding the status of the databases that
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* is used in the routing decisions.
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*
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* startMonitor is called to start the monitoring process, it is called on the main
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* thread of the gateway and is responsible for creating a thread for the monitor
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* itself to run on. This should use the entry points defined in the thread.h
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* header file rather than make direct calls to the operating system thrading libraries.
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* The return from startMonitor is a void * handle that will be passed to all other monitor
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* API calls.
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*
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* stopMonitor is responsible for shuting down and destroying a monitor, it is called
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* with the void * handle that was returned by startMonitor.
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*
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* registerServer is called to register a server that must be monitored with a running
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* monitor. this will be called with the handle returned from the startMonitor call and
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* the SERVER structure that the monitor must update and monitor. The SERVER structure
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* contains the information required to connect to the monitored server.
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*
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* unregisterServer is called to remove a server from the set of servers that need to be
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* monitored.
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*/
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typedef struct {
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void *(*startMonitor)(void *);
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void (*stopMonitor)(void *);
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void (*registerServer)(void *, SERVER *);
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void (*unregisterServer)(void *, SERVER *);
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void (*defaultUser)(void *, char *, char *);
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void (*diagnostics)(DCB *, void *);
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void (*setInterval)(void *, size_t);
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void (*defaultId)(void *, unsigned long);
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void (*replicationHeartbeat)(void *, int);
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void (*detectStaleMaster)(void *, int);
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} MONITOR_OBJECT;
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/**
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* The monitor API version number. Any change to the monitor module API
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* must change these versions usign the rules defined in modinfo.h
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*/
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#define MONITOR_VERSION {1, 0, 0}
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/** Monitor's poll frequency */
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#define MON_BASE_INTERVAL_MS 100
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/**
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* Monitor state bit mask values
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*/
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typedef enum
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{
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MONITOR_STATE_ALLOC = 0x00,
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MONITOR_STATE_RUNNING = 0x01,
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MONITOR_STATE_STOPPING = 0x02,
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MONITOR_STATE_STOPPED = 0x04,
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MONITOR_STATE_FREED = 0x08
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} monitor_state_t;
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/**
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* Representation of the running monitor.
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*/
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typedef struct monitor {
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char *name; /**< The name of the monitor module */
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monitor_state_t state; /**< The state of the monitor */
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MONITOR_OBJECT *module; /**< The "monitor object" */
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void *handle; /**< Handle returned from startMonitor */
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size_t interval; /**< The monitor interval */
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struct monitor *next; /**< Next monitor in the linked list */
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} MONITOR;
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extern MONITOR *monitor_alloc(char *, char *);
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extern void monitor_free(MONITOR *);
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extern MONITOR *monitor_find(char *);
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extern void monitorAddServer(MONITOR *, SERVER *);
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extern void monitorAddUser(MONITOR *, char *, char *);
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extern void monitorStop(MONITOR *);
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extern void monitorStart(MONITOR *);
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extern void monitorStopAll();
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extern void monitorShowAll(DCB *);
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extern void monitorShow(DCB *, MONITOR *);
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extern void monitorList(DCB *);
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extern void monitorSetId(MONITOR *, unsigned long);
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extern void monitorSetInterval (MONITOR *, unsigned long);
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extern void monitorSetReplicationHeartbeat(MONITOR *, int);
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extern void monitorDetectStaleMaster(MONITOR *, int);
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#endif
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