~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

 *

 *  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

 */

#include <drizzled/server_includes.h>

#include <drizzled/ha_trx_info.h>

#include <drizzled/plugin/storage_engine.h>

#include <drizzled/session.h>

using namespace drizzled;

void Ha_trx_info::register_ha(Session_TRANS *trans,

                              plugin::StorageEngine *engine_arg)

{

  assert(m_flags == 0);

  assert(m_engine == NULL);

  assert(m_next == NULL);

  m_engine= engine_arg;

  m_flags= (int) TRX_READ_ONLY; /* Assume read-only at start. */

  m_next= trans->ha_list;

  trans->ha_list= this;

}

/** Clear, prepare for reuse. */

void Ha_trx_info::reset()

{

  m_next= NULL;

  m_engine= NULL;

  m_flags= 0;

}

void Ha_trx_info::set_trx_read_write()

{

  assert(is_started());

  m_flags|= (int) TRX_READ_WRITE;

}

bool Ha_trx_info::is_trx_read_write() const

{

  assert(is_started());

  return m_flags & (int) TRX_READ_WRITE;

}

bool Ha_trx_info::is_started() const

{

  return m_engine != NULL;

}

/** Mark this transaction read-write if the argument is read-write. */

void Ha_trx_info::coalesce_trx_with(const Ha_trx_info *stmt_trx)

{

  /*

    Must be called only after the transaction has been started.

    Can be called many times, e.g. when we have many

    read-write statements in a transaction.

  */

  assert(is_started());

  if (stmt_trx->is_trx_read_write())

    set_trx_read_write();

}

Ha_trx_info *Ha_trx_info::next() const

{

  assert(is_started());

  return m_next;

}

plugin::StorageEngine *Ha_trx_info::engine() const

{

  assert(is_started());

  return m_engine;

}