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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Definitions required for Query Cache plugin
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* Copyright (C) 2008 Sun Microsystems, Toru Maesaka
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* Copyright (C) 2010 Djellel Eddine Difallah
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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#ifndef DRIZZLED_PLUGIN_QUERY_CACHE_H
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#define DRIZZLED_PLUGIN_QUERY_CACHE_H
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#include "drizzled/plugin.h"
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#include "drizzled/plugin/plugin.h"
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#include <drizzled/sql_list.h>
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This is the API that a qcache plugin must implement.
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it should implement each of these function pointers.
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if a function pointer is NULL (not loaded), that's ok.
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class QueryCache : public Plugin
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QueryCache(const QueryCache &);
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QueryCache& operator=(const QueryCache &);
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explicit QueryCache(std::string name_arg)
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: Plugin(name_arg, "QueryCache")
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virtual ~QueryCache() {}
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/* Lookup the cache and transmit the data back to the client */
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virtual bool tryFetchAndSend(Session *session,
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bool is_transactional)= 0;
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virtual bool set(Session *session, bool is_transactional)= 0;
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virtual bool invalidateTable(Session *session, bool is_transactional)= 0;
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virtual bool invalidateDb(Session *session, const char *db_name,
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bool transactional)= 0;
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virtual bool flush(Session *session)= 0;
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/* these are the Query Cache interface functions */
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/* Lookup the cache and transmit the data back to the client */
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virtual bool doIsCached(Session* session)= 0;
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/* Lookup the cache and transmit the data back to the client */
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virtual bool doSendCachedResultset(Session *session)= 0;
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/* Send the current Resultset to the cache */
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virtual bool doSetResultset(Session *session)= 0;
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/* initiate a new Resultset (header) */
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virtual bool doPrepareResultset(Session *session)= 0;
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/* push a record to the current Resultset */
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virtual bool doInsertRecord(Session *session, List<Item> &item)= 0;
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static bool addPlugin(QueryCache *handler);
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static void removePlugin(QueryCache *handler);
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/* These are the functions called by the rest of the Drizzle server */
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static bool tryFetchAndSendDo(Session *session, bool transactional);
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static bool setDo(Session *session, bool transactional);
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static bool invalidateTableDo(Session *session, bool transactional);
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static bool invalidateDbDo(Session *session, const char *db_name,
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static bool flushDo(Session *session);
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static bool isCached(Session *session);
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static bool sendCachedResultset(Session *session);
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static bool prepareResultset(Session *session);
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static bool setResultset(Session *session);
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static bool insertRecord(Session *session, List<Item> &item);
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} /* namespace plugin */