91f1b4bc6f
- as command types in protocol modules (standard routing or session change routing) - to write back the data from backend (discard multiple backends ouput)
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
#ifndef _ROUTER_H
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#define _ROUTER_H
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/*
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* This file is distributed as part of the SkySQL Gateway. 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 SkySQL Ab 2013
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*/
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/**
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* @file router.h - The query router interface mechanisms
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*
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* Revision History
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*
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* Date Who Description
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* 14/06/2013 Mark Riddoch Initial implementation
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* 26/06/2013 Mark Riddoch Addition of router options
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* and the diagnostic entry point
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* 15/07/2013 Massimiliano Pinto Added clientReply entry point
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* 16/07/2013 Massimiliano Pinto Added router commands values
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*
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*/
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#include <service.h>
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#include <session.h>
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#include <buffer.h>
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/**
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* The ROUTER handle points to module specific data, so the best we can do
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* is to make it a void * externally.
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*/
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typedef void *ROUTER;
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/**
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* @verbatim
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* The "module object" structure for a query router module
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*
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* The entry points are:
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* createInstance Called by the service to create a new
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* instance of the query router
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* newSession Called to create a new user session
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* within the query router
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* closeSession Called when a session is closed
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* routeQuery Called on each query that requires
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* routing
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* diagnostics Called to force the router to print
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* diagnostic output
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* clientReply Called to reply to client the data from one or all backends
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*
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* @endverbatim
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*
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* @see load_module
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*/
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typedef struct router_object {
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ROUTER *(*createInstance)(SERVICE *service, char **options);
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void *(*newSession)(ROUTER *instance, SESSION *session);
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void (*closeSession)(ROUTER *instance, void *router_session);
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int (*routeQuery)(ROUTER *instance, void *router_session, GWBUF *queue);
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void (*diagnostics)(ROUTER *instance, DCB *dcb);
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void (*clientReply)(ROUTER* instance, void* router_session, GWBUF* queue, DCB *backend_dcb);
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} ROUTER_OBJECT;
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/* Router commands */
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#define ROUTER_DEFAULT 0 /**< Standard routing */
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#define ROUTER_CHANGE_SESSION 1 /**< Route a change session */
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#endif
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