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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2010 Brian Aker
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include <boost/bind.hpp>
#include <drizzled/error.h>
#include <drizzled/catalog.h>
#include <drizzled/plugin/catalog.h>
#include <boost/unordered_map.hpp>
#include <boost/thread/mutex.hpp>
namespace drizzled {
namespace plugin {
class Catalog;
}
namespace generator {
namespace catalog {
class Cache;
class Instance;
} //namespace catalog
} //namespace generator
namespace catalog {
namespace lock {
class Create;
class Erase;
} //namespace lock
class Cache
{
static inline Cache &singleton()
{
static Cache open_cache;
return open_cache;
}
size_t size() const
{
return cache.size();
}
void rehash(size_t arg)
{
cache.rehash(arg);
}
Instance::shared_ptr find(const identifier::Catalog &identifier, drizzled::error_t &error);
bool exist(const identifier::Catalog &identifier);
bool erase(const identifier::Catalog &identifier, drizzled::error_t &error);
bool insert(const identifier::Catalog &identifier, Instance::shared_ptr instance, drizzled::error_t &error);
bool lock(const identifier::Catalog &identifier, drizzled::error_t &error);
bool unlock(const identifier::Catalog &identifier, drizzled::error_t &error);
friend class drizzled::generator::catalog::Cache;
friend class drizzled::plugin::Catalog;
friend class drizzled::catalog::lock::Erase;
friend class drizzled::catalog::lock::Create;
void copy(catalog::Instance::vector &vector);
typedef boost::unordered_map< identifier::Catalog, catalog::Instance::shared_ptr> unordered_map;
unordered_map cache;
boost::mutex _mutex;
};
namespace lock {
class Erase
{
bool _locked;
const identifier::Catalog &identifier;
drizzled::error_t error;
public:
Erase(const identifier::Catalog &identifier_arg) :
_locked(false),
identifier(identifier_arg)
{
init();
}
bool locked () const
{
return _locked;
}
~Erase()
{
if (_locked)
{
if (not catalog::Cache::singleton().unlock(identifier, error))
{
my_error(error, identifier);
assert(0);
}
}
}
private:
void init()
{
// We insert a lock into the cache, if this fails we bail.
if (not catalog::Cache::singleton().lock(identifier, error))
{
assert(0);
return;
}
_locked= true;
}
};
class Create
{
bool _locked;
const identifier::Catalog &identifier;
drizzled::error_t error;
public:
Create(const identifier::Catalog &identifier_arg) :
_locked(false),
identifier(identifier_arg)
{
init();
}
bool locked () const
{
return _locked;
}
~Create()
{
if (_locked)
{
if (not catalog::Cache::singleton().unlock(identifier, error))
{
my_error(error, identifier);
assert(0);
}
}
}
private:
void init()
{
// We insert a lock into the cache, if this fails we bail.
if (not catalog::Cache::singleton().lock(identifier, error))
{
my_error(error, identifier);
return;
}
_locked= true;
}
};
} /* namespace lock */
} /* namespace catalog */
} /* namespace drizzled */
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