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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/thread/mutex.hpp>
#include <boost/make_shared.hpp>
#include <drizzled/message/catalog.h>
namespace drizzled {
namespace catalog {
class Instance
{
Instance() :
_locked(false),
_lock_id(0)
{ };
bool _locked;
drizzled::session_id_t _lock_id;
message::catalog::shared_ptr _message;
mutable boost::mutex _schema_lock;
mutable boost::mutex _system_variable_lock;
public:
typedef boost::shared_ptr<Instance> shared_ptr;
typedef std::vector<shared_ptr> vector;
typedef const Instance* const_pointer;
typedef const Instance& const_reference;
typedef Instance& reference;
Instance(message::catalog::shared_ptr &message_arg)
{
_message= message_arg;
};
Instance(const message::catalog::shared_ptr &message_arg)
{
_message= message_arg;
};
static shared_ptr make_shared(message::catalog::shared_ptr &message_arg)
{
assert(not message_arg->name().empty());
return boost::make_shared<Instance>(message_arg);
};
static shared_ptr make_shared(const identifier::Catalog &identifier)
{
drizzled::message::catalog::shared_ptr new_message= drizzled::message::catalog::make_shared(identifier);
assert(not new_message->name().empty());
return boost::make_shared<Instance>(new_message);
}
const std::string &getName() const
{
assert(_message);
return _message->name();
}
const std::string &name() const
{
assert(_message);
return _message->name();
}
message::catalog::shared_ptr message() const
{
return _message;
}
bool locked() const
{
return _locked;
}
bool lock(drizzled::session_id_t id)
{
if (_locked and _lock_id == id)
{
assert(0); // We shouldn't support recursion
return true;
}
else if (_locked)
{
return false;
}
_locked= true;
_lock_id= id;
return true;
}
bool unlock(drizzled::session_id_t id)
{
if (_locked and _lock_id == id)
{
_locked= false;
_lock_id= 0;
return true;
}
return false;
}
boost::mutex &schemaLock()
{
return _schema_lock;
}
boost::mutex &systemVariableLock()
{
return _system_variable_lock;
}
};
} /* namespace catalog */
} /* namespace drizzled */
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