4f3d746f4e
buffer.c: added memory release for hint of a GWBUF hint.c: added bool hint_exists() hint.h: added placeholder for hint type HINT_ROUTE_TO_ALL which doesn't have implementation yet. filter/Makefile: fixed dependency issue hintparser.c: added const char* token_get_keyword(), hint_parser:added NULL check, hint_next_token: fixed off-by-one bug readwritesplit.h: added bitfield for hints' use, which includes route targets and flag for case where user hinted to route to named backend server. readwritesplit.c: added function route_target_t get_route_target() for resolving route target based on 1) query type (from query_classifier) 2) transaction state (active/not) and 3) hints. Modified get_dcb, which is called in routeQuery to provide pointer to correct backend DCB. Now get_dcb also takes server unique name as a parameter if such a hint was found. for hints' use, which includes enter the commit message for your changes.
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
#ifndef _HINT_H
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#define _HINT_H
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/*
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* This file is distributed as part of 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 SkySQL Ab 2014
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*/
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/**
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* @file hint.h The generic hint data that may be attached to buffers
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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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* 10/07/14 Mark Riddoch Initial implementation
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*
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* @endverbatim
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*/
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#include <skygw_debug.h>
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/**
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* The types of hint that are supported by the generic hinting mechanism.
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*/
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typedef enum {
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HINT_ROUTE_TO_MASTER = 1,
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HINT_ROUTE_TO_SLAVE,
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HINT_ROUTE_TO_NAMED_SERVER,
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HINT_ROUTE_TO_UPTODATE_SERVER,
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HINT_ROUTE_TO_ALL, /*< not implemented yet */
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HINT_PARAMETER
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} HINT_TYPE;
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/**
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* A generic hint.
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*
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* A hint has a type associated with it and may optionally have hint
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* specific data.
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* Multiple hints may be attached to a single buffer.
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*/
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typedef struct hint {
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HINT_TYPE type; /*< The Type of hint */
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void *data; /*< Type specific data */
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void *value; /*< Parameter value for hint */
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unsigned int dsize; /*< Size of the hint data */
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struct hint *next; /*< Another hint for this buffer */
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} HINT;
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extern HINT *hint_alloc(HINT_TYPE, void *, unsigned int);
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extern HINT *hint_create_parameter(HINT *, char *, char *);
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extern HINT *hint_create_route(HINT *, HINT_TYPE, char *);
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extern void hint_free(HINT *);
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extern HINT *hint_dup(HINT *);
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bool hint_exists(HINT **, HINT_TYPE);
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#endif
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