~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

 */

#ifndef DRIZZLED_MODULE_REGISTRY_H

#define DRIZZLED_MODULE_REGISTRY_H

#include <string>

#include <vector>

#include <map>

#include <algorithm>

#include <iostream>

#include <boost/scoped_ptr.hpp>

#include "drizzled/gettext.h"

#include "drizzled/unireg.h"

#include "drizzled/errmsg_print.h"

#include "drizzled/plugin/plugin.h"

namespace drizzled

{

namespace module

{

class Module;

class Library;

class Graph;

class Registry

{

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(const Registry&);

  Registry& operator=(const Registry&);

  ~Registry();

  void buildDeps();

public:

  static Registry& singleton()

  {

    static Registry *registry= new Registry();

    return *registry;

  }

  void copy(plugin::Plugin::vector &arg);

  static void shutdown();

  Module *find(std::string name);

  void add(Module *module);

  void remove(Module *module);

  std::vector<Module *> 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(plugin->getTypeName());

    std::transform(plugin_type.begin(), plugin_type.end(),

                   plugin_type.begin(), ::tolower);

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

    std::transform(plugin_name.begin(), plugin_name.end(),

                   plugin_name.begin(), ::tolower);

    if (plugin_registry.find(std::make_pair(plugin_type, plugin_name)) != plugin_registry.end())

    {

      errmsg_printf(error::ERROR,

                    _("Loading plugin %s failed: a %s plugin by that name "

                      "already exists.\n"),

                    plugin->getTypeName().c_str(),

                    plugin->getName().c_str());

      failed= true;

    }

    if (T::addPlugin(plugin))

    {

      failed= true;

    }

    if (failed)

    {

      errmsg_printf(error::ERROR,

                    _("Fatal error: Failed initializing %s::%s plugin.\n"),

                    plugin->getTypeName().c_str(),

                    plugin->getName().c_str());

      unireg_abort(1);

    }

    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(plugin->getTypeName());

    std::transform(plugin_type.begin(), plugin_type.end(),

                   plugin_type.begin(), ::tolower);

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

    std::transform(plugin_name.begin(), plugin_name.end(),

                   plugin_name.begin(), ::tolower);

    T::removePlugin(plugin);

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

  }

};

} /* namespace module */

} /* namespace drizzled */

#endif /* DRIZZLED_MODULE_REGISTRY_H */