~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems, Inc.

 *

 *  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; version 2 of the License.

 *

 *  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 <drizzled/atomics.h>

#include <drizzled/common_fwd.h>

namespace drizzled {

class Query_id

{

public:

  static Query_id& get_query_id() 

  {

    return the_id;

  }

  /* return current query_id value */

  query_id_t value() const

  {

    return the_query_id;

  }

  /* increment query_id and return it.  */

  query_id_t next()

  {

    return the_query_id.increment();

  }

private:

  Query_id()

  {

    the_query_id= 1;

  }

  static Query_id the_id;

  atomic<uint64_t> the_query_id;

};

} /* namespace drizzled */