Files
MaxScale/modules/include/readwritesplit.h
Mark Riddoch 619af90696 Implementation of shared buffer level in the gwbuf so that one set of data can be kept with
different offsets for different gwbufs

Updated monitor to better handle maste/slave replication environments

Split MASTER and SERVER bits in the erver bitmask so that we canhave more states, MASTER, SLAVE and NOT IN REPLICATION

Updates to the read write splitter for routing commands to all nodes, diagnostic output and fixes to the algorithm to pick up a master and slave connection
2013-07-11 18:37:43 +02:00

84 lines
2.7 KiB
C

#ifndef _RWSPLITROUTER_H
#define _RWSPLITROUTER_H
/*
* This file is distributed as part of the SkySQL Gateway. It 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.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright SkySQL Ab 2013
*/
/**
* @file router.h - The read write split router module heder file
*
* @verbatim
* Revision History
*
* Tässä mitään historioita..
*
* @endverbatim
*/
#include <dcb.h>
typedef struct client_session CLIENT_SESSION;
typedef struct instance INSTANCE;
/**
* Internal structure used to define the set of backend servers we are routing
* connections to. This provides the storage for routing module specific data
* that is required for each of the backend servers.
*/
typedef struct backend {
SERVER* server; /**< The server itself */
int count; /**< Number of connections to the server */
} BACKEND;
/**
* The client session structure used within this router.
*/
struct client_session {
BACKEND* slave; /**< Slave used by the client session */
BACKEND* master; /**< Master used by the client session */
DCB* slaveconn; /**< Slave connection */
DCB* masterconn; /**< Master connection */
CLIENT_SESSION* next;
};
/**
* The statistics for this router instance
*/
typedef struct {
int n_sessions; /**< Number sessions created */
int n_queries; /**< Number of queries forwarded */
int n_master; /**< Number of statements sent to master */
int n_slave; /**< Number of statements sent to slave */
int n_all; /**< Number of statements sent to all */
} ROUTER_STATS;
/**
* The per instance data for the router.
*/
struct instance {
SERVICE* service; /**< Pointer to the service using this router */
CLIENT_SESSION* connections; /**< Link list of all the client connections */
SPINLOCK lock; /**< Spinlock for the instance data */
BACKEND** servers; /**< The set of backend servers for this instance */
BACKEND* master; /**< NULL if not known, pointer otherwise */
ROUTER_STATS stats; /**< Statistics for this router */
INSTANCE* next;
};
#endif