Drizzled Public API Documentation

cache.cc

00001 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2010 Brian Aker
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; either version 2 of the License, or
00009  *  (at your option) any later version.
00010  *
00011  *  This program is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU General Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU General Public License
00017  *  along with this program; if not, write to the Free Software
00018  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00019  */
00020 
00021 #include <config.h>
00022 
00023 #include <boost/bind.hpp>
00024 #include <boost/thread/mutex.hpp>
00025 #include <boost/thread/shared_mutex.hpp>
00026 
00027 #include <drizzled/session.h>
00028 #include <drizzled/identifier/table.h>
00029 #include <drizzled/definition/cache.h>
00030 #include <drizzled/table/instance.h>
00031 #include <drizzled/util/find_ptr.h>
00032 
00033 namespace drizzled {
00034 
00035 namespace definition {
00036 
00037 table::instance::Shared::shared_ptr Cache::find(const identifier::Table::Key &key)
00038 {
00039   boost::mutex::scoped_lock scopedLock(_mutex);
00040   if (Map::mapped_type* ptr= find_ptr(cache, key))
00041     return *ptr;
00042   return table::instance::Shared::shared_ptr();
00043 }
00044 
00045 void Cache::erase(const identifier::Table::Key &key)
00046 {
00047   boost::mutex::scoped_lock scopedLock(_mutex);
00048   
00049   cache.erase(key);
00050 }
00051 
00052 bool Cache::insert(const identifier::Table::Key &key, table::instance::Shared::shared_ptr share)
00053 {
00054   boost::mutex::scoped_lock scopedLock(_mutex);
00055   std::pair<Map::iterator, bool> ret=
00056     cache.insert(std::make_pair(key, share));
00057 
00058   return ret.second;
00059 }
00060 
00061 void Cache::CopyFrom(drizzled::table::instance::Shared::vector &vector)
00062 {
00063   boost::mutex::scoped_lock scopedLock(_mutex);
00064 
00065   vector.reserve(definition::Cache::singleton().size());
00066 
00067   std::transform(cache.begin(),
00068                  cache.end(),
00069                  std::back_inserter(vector),
00070                  boost::bind(&Map::value_type::second, _1) );
00071   assert(vector.size() == cache.size());
00072 }
00073 
00074 } /* namespace definition */
00075 } /* namespace drizzled */