~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 <string>

#include <vector>

#include <map>

#include <algorithm>

#include <iosfwd>

#include <boost/algorithm/string.hpp>

#include <boost/scoped_ptr.hpp>

#include <drizzled/gettext.h>

#include <drizzled/unireg.h>

#include <drizzled/errmsg_print.h>

#include <drizzled/plugin/plugin.h>

#include <drizzled/util/find_ptr.h>

namespace drizzled {

namespace module {

class Registry : boost::noncopyable

{

public:

  typedef std::map<std::string, Library*> LibraryMap;

  typedef std::map<std::string, Module*> ModuleMap;

  typedef std::vector<Module*> ModuleList;

private:

  LibraryMap library_registry_;

  ModuleMap module_registry_;

  boost::scoped_ptr<Graph> depend_graph_; 

  plugin::Plugin::map plugin_registry;

  bool deps_built_;

  Registry();

  ~Registry();

  void buildDeps();

public:

  static Registry& singleton()

  {

    static Registry* registry= new Registry();

    return *registry;

  }

  static void shutdown();

  Module* find(const std::string&);

  void add(Module*);

  void remove(Module*);

  ModuleList getList();

  const plugin::Plugin::map &getPluginsMap() const

  {

    return plugin_registry;

  }

  const ModuleMap &getModulesMap() const

  {

    return module_registry_;

  }

  Library *addLibrary(const std::string &plugin_name, bool builtin= false);

  void removeLibrary(const std::string &plugin_name);

  Library *findLibrary(const std::string &plugin_name) const;

  void shutdownModules();

  template<class T>

  void add(T *plugin)

  {

    bool failed= false;

    std::string plugin_type(boost::to_lower_copy(plugin->getTypeName()));

    std::string plugin_name(boost::to_lower_copy(plugin->getName()));

    if (find_ptr(plugin_registry, std::make_pair(plugin_type, plugin_name)))

    {

      std::string error_message;

      error_message+=  _("Loading plugin failed, a plugin by that name already exists.");

      error_message+= plugin->getTypeName();

      error_message+= ":";

      error_message+= plugin->getName();

      unireg_actual_abort(__FILE__, __LINE__, __func__, error_message);

    }

    if (T::addPlugin(plugin))

    {

      std::string error_message;

      error_message+= _("Fatal error: Failed initializing: ");

      error_message+= plugin->getTypeName();

      error_message+= ":";

      error_message+= plugin->getName();

      unireg_actual_abort(__FILE__, __LINE__, __func__, error_message);

    }

    if (failed)

    {

      unireg_abort << _("Fatal error: Failed initializing: ") << plugin->getTypeName() << ":" << plugin->getName();

    }

    plugin_registry.insert(std::make_pair(std::make_pair(plugin_type, plugin_name), plugin));

  }

  template<class T>

  void remove(T *plugin)

  {

    std::string plugin_type(boost::to_lower_copy(plugin->getTypeName()));

    std::string plugin_name(boost::to_lower_copy(plugin->getName()));

    T::removePlugin(plugin);

    plugin_registry.erase(std::make_pair(plugin_type, plugin_name));

  }

};

} /* namespace module */

} /* namespace drizzled */