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/*
* Copyright (c) 2010, Djellel Eddine Difallah
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Djellel Eddine Difallah nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PLUGIN_MEMCACHED_QUERY_CACHE_QUERY_CACHE_SERVICE_H
#define PLUGIN_MEMCACHED_QUERY_CACHE_QUERY_CACHE_SERVICE_H
#include "drizzled/message/resultset.pb.h"
#include <drizzled/sql_list.h>
#include <map>
#include <vector>
namespace drizzled
{
class TableList;
class Item;
namespace message
{
class Resultset;
}
class QueryCacheService
{
public:
typedef std::map<std::string, drizzled::message::Resultset> CacheEntries;
typedef std::pair<const std::string, drizzled::message::Resultset> CacheEntry;
typedef std::map<std::string, std::vector<std::string>> CachedTablesEntries;
typedef std::pair<const std::string, std::vector<std::string>> CachedTablesEntry;
static const size_t DEFAULT_RECORD_SIZE= 100;
static CacheEntries cache;
static CachedTablesEntries cachedTables;
/**
* Singleton method
* Returns the singleton instance of QueryCacheService
*/
static inline QueryCacheService &singleton()
{
static QueryCacheService query_cache_service;
return query_cache_service;
};
/**
* Method which returns the active Resultset message
* for the supplied Session. If one is not found, a new Resultset
* message is allocated, initialized, and returned.
*
* @param The session processing the Select
*/
drizzled::message::Resultset *setCurrentResultsetMessage(drizzled::Session *in_session);
/**
* Helper method which initializes the header message for
* a Resultset.
*
* @param[inout] Resultset message container to modify
* @param[in] Pointer to the Session doing the processing
* @param[in] Pointer to the Table being inserted into
*/
void setResultsetHeader(drizzled::message::Resultset &resultset,
drizzled::Session *in_session,
drizzled::TableList *in_table);
/**
* Creates a new SelectRecord GPB message and pushes it to
* currrent Resultset.
*
* @param Pointer to the Session which has inserted a record
* @param Pointer to the List<Items> to add
*/
bool addRecord(drizzled::Session *in_session, drizzled::List<drizzled::Item> &list);
/* cache fetching */
static bool isCached(std::string query);
};
} /* namespace drizzled */
#endif /* PLUGIN_MEMCACHED_QUERY_CACHE_QUERY_CACHE_SERVICE_H */
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