~drizzle-trunk/drizzle/development

/* - 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

 */

#include <config.h>

#include <drizzled/session.h>

#include <drizzled/user_var_entry.h>

#include <drizzled/plugin/client/cached.h>

#include <drizzled/plugin/client/concurrent.h>

#include <drizzled/catalog/local.h>

#include <drizzled/execute.h>

namespace drizzled

{

Execute::Execute(Session &arg, bool wait_arg) :

  wait(wait_arg),

  _session(arg)

{

}

Execute::~Execute()

{

}

void Execute::run(const char *arg, size_t length)

{

  std::string execution_string(arg, length);

  run(execution_string);

}

void Execute::run(std::string &execution_string, sql::ResultSet &result_set)

{

  boost_thread_shared_ptr thread;

  if (_session.isConcurrentExecuteAllowed())

  {

    plugin::client::Cached *client= new plugin::client::Cached(result_set);

    client->pushSQL(execution_string);

    Session::shared_ptr new_session= Session::make_shared(client, catalog::local());

    // We set the current schema.  @todo do the same with catalog

    util::string::const_shared_ptr schema(_session.schema());

    if (not schema->empty())

      new_session->set_db(*schema);

    new_session->setConcurrentExecute(false);

    // Overwrite the context in the next session, with what we have in our

    // session. Eventually we will allow someone to change the effective

    // user.

    new_session->user()= _session.user();

    if (Session::schedule(new_session))

    {

      Session::unlink(new_session);

    }

    else if (wait)

    {

      thread= new_session->getThread();

    }

  }

  else

  {

    my_error(ER_WRONG_ARGUMENTS, MYF(0), "A Concurrent Execution Session can not launch another session.");

    return;

  }

  if (wait && thread && thread->joinable())

  {

    // We want to make sure that we can be killed

    if (_session.getThread())

    {

      boost::this_thread::restore_interruption dl(_session.getThreadInterupt());

      try {

        thread->join();

      }

      catch(boost::thread_interrupted const&)

      {

        // Just surpress and return the error

        my_error(drizzled::ER_QUERY_INTERRUPTED, MYF(0));

        return;

      }

    }

    else

    {

      thread->join();

    }

  }

}

void Execute::run(std::string &execution_string)

{

  boost_thread_shared_ptr thread;

  if (_session.isConcurrentExecuteAllowed())

  {

    plugin::client::Concurrent *client= new plugin::client::Concurrent;

    client->pushSQL(execution_string);

    Session::shared_ptr new_session= Session::make_shared(client, catalog::local());

    // We set the current schema.  @todo do the same with catalog

    util::string::const_shared_ptr schema(_session.schema());

    if (not schema->empty())

      new_session->set_db(*schema);

    new_session->setConcurrentExecute(false);

    // Overwrite the context in the next session, with what we have in our

    // session. Eventually we will allow someone to change the effective

    // user.

    new_session->user()= _session.user();

    if (Session::schedule(new_session))

    {

      Session::unlink(new_session);

    }

    else if (wait)

    {

      thread= new_session->getThread();

    }

  }

  else

  {

    my_error(ER_WRONG_ARGUMENTS, MYF(0), "A Concurrent Execution Session can not launch another session.");

    return;

  }

  if (wait && thread && thread->joinable())

  {

    // We want to make sure that we can be killed

    if (_session.getThread())

    {

      boost::this_thread::restore_interruption dl(_session.getThreadInterupt());

      try {

        thread->join();

      }

      catch(boost::thread_interrupted const&)

      {

        // Just surpress and return the error

        my_error(drizzled::ER_QUERY_INTERRUPTED, MYF(0));

        return;

      }

    }

    else

    {

      thread->join();

    }

  }

}

} /* namespace drizzled */