Drizzled Public API Documentation

cache.cc
1 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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3  *
4  * Copyright (C) 2010 Brian Aker
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
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10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
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16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <config.h>
22 
23 #include <boost/bind.hpp>
24 #include <boost/thread/mutex.hpp>
25 #include <boost/thread/shared_mutex.hpp>
26 
27 #include <drizzled/session.h>
28 #include <drizzled/identifier/table.h>
29 #include <drizzled/definition/cache.h>
30 #include <drizzled/table/instance.h>
31 #include <drizzled/util/find_ptr.h>
32 
33 namespace drizzled {
34 namespace definition {
35 
36 Cache::Map Cache::cache;
37 boost::mutex Cache::_mutex;
38 
39 table::instance::Shared::shared_ptr Cache::find(const identifier::Table::Key &key)
40 {
41  boost::mutex::scoped_lock scopedLock(_mutex);
42  if (Map::mapped_type* ptr= find_ptr(cache, key))
43  return *ptr;
44  return table::instance::Shared::shared_ptr();
45 }
46 
47 void Cache::erase(const identifier::Table::Key &key)
48 {
49  boost::mutex::scoped_lock scopedLock(_mutex);
50 
51  cache.erase(key);
52 }
53 
54 bool Cache::insert(const identifier::Table::Key &key, table::instance::Shared::shared_ptr share)
55 {
56  boost::mutex::scoped_lock scopedLock(_mutex);
57  std::pair<Map::iterator, bool> ret= cache.insert(std::make_pair(key, share));
58 
59  return ret.second;
60 }
61 
62 void Cache::CopyFrom(drizzled::table::instance::Shared::vector &vector)
63 {
64  boost::mutex::scoped_lock scopedLock(_mutex);
65 
66  vector.reserve(definition::Cache::size());
67 
68  std::transform(cache.begin(), cache.end(), std::back_inserter(vector), boost::bind(&Map::value_type::second, _1));
69  assert(vector.size() == cache.size());
70 }
71 
72 } /* namespace definition */
73 } /* namespace drizzled */