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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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* Copyright (C) 2008 Sun Microsystems
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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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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include <drizzled/server_includes.h>
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#include <drizzled/qcache.h>
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#include <drizzled/gettext.h>
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#include "drizzled/plugin/registry.h"
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static vector<QueryCache *> all_query_cache;
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void add_query_cache(QueryCache *handler)
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all_query_cache.push_back(handler);
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void remove_query_cache(QueryCache *handler)
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all_query_cache.erase(find(all_query_cache.begin(), all_query_cache.end(),
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/* Namespaces are here to prevent global symbol clashes with these classes */
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namespace query_cache {
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class TryFetchAndSendIterate
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: public unary_function<QueryCache *, bool>
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bool is_transactional;
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TryFetchAndSendIterate(Session *session_arg, bool is_transactional_arg) :
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unary_function<QueryCache *, bool>(),
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session(session_arg), is_transactional(is_transactional_arg) { }
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inline result_type operator()(argument_type handler)
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if (handler->try_fetch_and_send(session, is_transactional))
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errmsg_printf(ERRMSG_LVL_ERROR,
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_("qcache plugin '%s' try_fetch_and_send() failed"),
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handler->getName().c_str());
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: public unary_function<QueryCache *, bool>
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bool is_transactional;
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SetIterate(Session *session_arg, bool is_transactional_arg) :
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unary_function<QueryCache *, bool>(),
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session(session_arg), is_transactional(is_transactional_arg) { }
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inline result_type operator()(argument_type handler)
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if (handler->set(session, is_transactional))
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errmsg_printf(ERRMSG_LVL_ERROR, _("qcache plugin '%s' set() failed"),
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handler->getName().c_str());
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class InvalidateTableIterate
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: public unary_function<QueryCache *, bool>
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bool is_transactional;
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InvalidateTableIterate(Session *session_arg, bool is_transactional_arg) :
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unary_function<QueryCache *, bool>(),
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session(session_arg), is_transactional(is_transactional_arg) { }
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inline result_type operator()(argument_type handler)
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if (handler->invalidate_table(session, is_transactional))
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errmsg_printf(ERRMSG_LVL_ERROR,
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_("qcache plugin '%s' invalidate_table() failed"),
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handler->getName().c_str());
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class InvalidateDbIterate
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: public unary_function<QueryCache *, bool>
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bool is_transactional;
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InvalidateDbIterate(Session *session_arg, const char *dbname_arg,
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bool is_transactional_arg) :
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unary_function<QueryCache *, bool>(),
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session(session_arg), dbname(dbname_arg),
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is_transactional(is_transactional_arg) { }
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inline result_type operator()(argument_type handler)
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if (handler->invalidate_db(session, dbname, is_transactional))
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errmsg_printf(ERRMSG_LVL_ERROR,
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_("qcache plugin '%s' invalidate_db() failed"),
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handler->getName().c_str());
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: public unary_function<QueryCache *, bool>
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FlushIterate(Session *session_arg) :
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unary_function<QueryCache *, bool>(), session(session_arg) { }
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inline result_type operator()(argument_type handler)
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if (handler->flush(session))
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errmsg_printf(ERRMSG_LVL_ERROR, _("qcache plugin '%s' flush() failed"),
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handler->getName().c_str());
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try_fetch_and_send();
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are the entry points to the query cache plugin that is called by the
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rest of the Drizzle server code.
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bool try_fetch_and_send(Session *session, bool transactional)
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/* Use find_if instead of foreach so that we can collect return codes */
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vector<QueryCache *>::iterator iter=
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find_if(all_query_cache.begin(), all_query_cache.end(),
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TryFetchAndSendIterate(session, transactional));
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/* If iter is == end() here, that means that all of the plugins returned
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* false, which in this case means they all succeeded. Since we want to
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* return false on success, we return the value of the two being !=
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return iter != all_query_cache.end();
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bool set(Session *session, bool transactional)
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/* Use find_if instead of foreach so that we can collect return codes */
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vector<QueryCache *>::iterator iter=
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find_if(all_query_cache.begin(), all_query_cache.end(),
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SetIterate(session, transactional));
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/* If iter is == end() here, that means that all of the plugins returned
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* false, which in this case means they all succeeded. Since we want to
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* return false on success, we return the value of the two being !=
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return iter != all_query_cache.end();
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bool invalidate_table(Session *session, bool transactional)
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/* Use find_if instead of foreach so that we can collect return codes */
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vector<QueryCache *>::iterator iter=
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find_if(all_query_cache.begin(), all_query_cache.end(),
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InvalidateTableIterate(session, transactional));
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/* If iter is == end() here, that means that all of the plugins returned
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* false, which in this case means they all succeeded. Since we want to
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* return false on success, we return the value of the two being !=
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return iter != all_query_cache.end();
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bool invalidate_db(Session *session, const char *dbname,
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/* Use find_if instead of foreach so that we can collect return codes */
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vector<QueryCache *>::iterator iter=
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find_if(all_query_cache.begin(), all_query_cache.end(),
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InvalidateDbIterate(session, dbname, transactional));
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/* If iter is == end() here, that means that all of the plugins returned
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* false, which in this case means they all succeeded. Since we want to
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* return false on success, we return the value of the two being !=
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return iter != all_query_cache.end();
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bool flush(Session *session)
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/* Use find_if instead of foreach so that we can collect return codes */
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vector<QueryCache *>::iterator iter=
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find_if(all_query_cache.begin(), all_query_cache.end(),
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FlushIterate(session));
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/* If iter is == end() here, that means that all of the plugins returned
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* false, which in this case means they all succeeded. Since we want to
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* return false on success, we return the value of the two being !=
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return iter != all_query_cache.end();
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} /* namespace query_cache */
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} /* namespace drizzled */