Drizzled Public API Documentation

query_cache_service.h
00001 /* 
00002  * Copyright (C) 2010 Djellel Eddine Difallah
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions are met:
00007  *
00008  *   * Redistributions of source code must retain the above copyright notice,
00009  *     this list of conditions and the following disclaimer.
00010  *   * Redistributions in binary form must reproduce the above copyright notice,
00011  *     this list of conditions and the following disclaimer in the documentation
00012  *     and/or other materials provided with the distribution.
00013  *   * Neither the name of Djellel Eddine Difallah nor the names of its contributors
00014  *     may be used to endorse or promote products derived from this software
00015  *     without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
00021  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00022  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00023  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00026  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
00027  * THE POSSIBILITY OF SUCH DAMAGE.
00028  */
00029 #pragma once
00030 
00031 #include <drizzled/message/resultset.pb.h>
00032 #include <drizzled/sql_list.h>
00033 #include <map>
00034 #include <vector>
00035 
00036 namespace drizzled
00037 {
00038 class TableList;
00039 class Item;
00040 
00041 namespace message
00042 {
00043 class Resultset;
00044 }
00045 
00046 class QueryCacheService
00047 {
00048 public:
00049 
00050   typedef std::map<std::string, drizzled::message::Resultset> CacheEntries;
00051   typedef std::pair<const std::string, drizzled::message::Resultset> CacheEntry;
00052   typedef std::map<std::string, std::vector<std::string>> CachedTablesEntries;
00053   typedef std::pair<const std::string, std::vector<std::string>> CachedTablesEntry;
00054 
00055   static const size_t DEFAULT_RECORD_SIZE= 100;
00056   static CacheEntries cache;
00057   static CachedTablesEntries cachedTables;
00058 
00063   static inline QueryCacheService &singleton()
00064   {
00065     static QueryCacheService query_cache_service;
00066     return query_cache_service;
00067   };
00068 
00076   drizzled::message::Resultset *setCurrentResultsetMessage(drizzled::Session *in_session);
00077 
00086   void setResultsetHeader(drizzled::message::Resultset &resultset,
00087                        drizzled::Session *in_session,
00088                        drizzled::TableList *in_table);
00096   bool addRecord(drizzled::Session *in_session, drizzled::List<drizzled::Item> &list);
00097 
00098   /* cache fetching */
00099   static bool isCached(std::string query);
00100   
00101 }; 
00102 } /* namespace drizzled */