PluginLoader.cc

/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
*      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen       *
*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper is free software: you can redistribute it and/or modify       *
*  it under the terms of the GNU Lesser General Public License as            *
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*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper is distributed in the hope that it will be useful,            *
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*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
*  GNU Lesser General Public License for more details.                       *
*                                                                            *
*  You should have received a copy of the GNU LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
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\*===========================================================================*/

/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                         *
*   $Date$                     *
*                                                                            *
\*===========================================================================*/




//=============================================================================
//
//  CLASS Core - IMPLEMENTATION of the Plugin Loading
//
//=============================================================================


//== INCLUDES =================================================================

// -------------------- mview
#include "Core.hh"

#include <QMenuBar>
#include <QToolBox>
#include <QMessageBox>
#include <QApplication>
#include <QScrollArea>

#include <QPluginLoader>
#include "OpenFlipper/BasePlugin/BaseInterface.hh"
#include "OpenFlipper/BasePlugin/KeyInterface.hh"
#include "OpenFlipper/BasePlugin/BackupInterface.hh"
#include "OpenFlipper/BasePlugin/LoggingInterface.hh"
#include "OpenFlipper/BasePlugin/MouseInterface.hh"
#include "OpenFlipper/BasePlugin/PickingInterface.hh"
#include "OpenFlipper/BasePlugin/ToolboxInterface.hh"
#include "OpenFlipper/BasePlugin/OptionsInterface.hh"
#include "OpenFlipper/BasePlugin/ToolbarInterface.hh"
#include "OpenFlipper/BasePlugin/TextureInterface.hh"
#include "OpenFlipper/BasePlugin/RenderInterface.hh"
#include "OpenFlipper/BasePlugin/PostProcessorInterface.hh"
#include "OpenFlipper/BasePlugin/MenuInterface.hh"
#include "OpenFlipper/BasePlugin/ContextMenuInterface.hh"
#include "OpenFlipper/BasePlugin/ProcessInterface.hh"
#include "OpenFlipper/BasePlugin/ViewInterface.hh"
#include "OpenFlipper/BasePlugin/ViewModeInterface.hh"
#include "OpenFlipper/BasePlugin/LoadSaveInterface.hh"
#include "OpenFlipper/BasePlugin/StatusbarInterface.hh"
#include "OpenFlipper/BasePlugin/INIInterface.hh"
#include "OpenFlipper/BasePlugin/FileInterface.hh"
#include "OpenFlipper/BasePlugin/RPCInterface.hh"
#include "OpenFlipper/BasePlugin/ScriptInterface.hh"
#include "OpenFlipper/BasePlugin/SecurityInterface.hh"
#include "OpenFlipper/BasePlugin/SelectionInterface.hh"
#include "OpenFlipper/BasePlugin/TypeInterface.hh"
#include "OpenFlipper/BasePlugin/PluginConnectionInterface.hh"

#include "OpenFlipper/common/RendererInfo.hh"

#include "OpenFlipper/INIFile/INIFile.hh"

#include "OpenFlipper/common/GlobalOptions.hh"

#include <QMessageBox>
#include <QtScript/QScriptValueIterator>

#include <ACG/QtWidgets/QtFileDialog.hh>
#include "OpenFlipper/widgets/PluginDialog/PluginDialog.hh"

#include <deque>
#include <limits>

/**
 * The number of plugins to load simultaneously.
 *
 * FIXME: This number should not be constant but be
 * determined from the number of processor cores.
 */
static const int PRELOAD_THREADS_COUNT = 8;

class PreloadAggregator {
    public:
        PreloadAggregator() : expectedLoaders_(0) {}

        /**
         * Intended to be called by a PreloadThread
         * before count subsequent calls to loaderReady().
         * May be called multiple times in which case
         * the counts accumulate.
         *
         * @param count The number of times the calling
         * PreloadThread intents to call loaderReady().
         */
        void expectLoaders(int count) {
            QMutexLocker loadersLock(&loadersMutex_);
            expectedLoaders_ += count;
        }

        /**
         * Intended to be called by a PreloadThread.
         *
         * Transfers ownership of the supplied loader
         * to the PreloadAggregator.
         */
        void loaderReady(QPluginLoader *loader) {
            QMutexLocker loadersLock(&loadersMutex_);
            loaders_.push_back(loader);
            --expectedLoaders_;
            pluginAvailable_.wakeOne();
        }

        /**
         * If there are still loaders expected, block
         * until the next loader becomes available and return
         * it.
         *
         * Ownership of the returned object is transferred
         * to the caller. (I.e. the caller has to delete it.)
         *
         * @return Null if there are no more loaders expected.
         * The next loader, otherwise.
         */
        QPluginLoader *waitForNextLoader() {
            QMutexLocker loadersLock(&loadersMutex_);
            if (loaders_.empty()) {
                if (expectedLoaders_ > 0) {
                    pluginAvailable_.wait(&loadersMutex_);
                } else {
                    return 0;
                }
            }

            /*
             * At this point, it is guaranteed that
             * loaders_.size() > 0.
             */
            QPluginLoader *result = loaders_.front();
            loaders_.pop_front();
            return result;
        }

    protected:
        std::deque<QPluginLoader *> loaders_;
        QWaitCondition pluginAvailable_;
        QMutex loadersMutex_;

        int expectedLoaders_;
};

class PreloadThread : public QThread
{
  public: 
    
    /** \brief Preload thread constructor
    *
    * This constructor initializes the preloading thread.
    *
    * @param aggregator aggregator managing the different threads
    */
    PreloadThread(PreloadAggregator *aggregator) : aggregator_(aggregator) {
    }
  
  public:
    
    void addFilename(const QString &filename) {
        QMutexLocker filenamesLock(&filenamesMutex_);
        filenames_.push_back(filename);
        aggregator_->expectLoaders(1);
    }

    /** \brief preload function
    *
    * This function is used in the thread to preload a plugin. The name is given in the constructor.
    */
    void run() {
      for (;;) {
          QString fileName;
          {
              /*
               * Just to be on the safe side, we protect
               * filenames_. (addFilename() could be called from
               * a different thread.)
               */
              QMutexLocker filenamesLock(&filenamesMutex_);
              if (filenames_.empty()) break;
              fileName = filenames_.front();
              filenames_.pop_front();
          }

          QPluginLoader *loader = new QPluginLoader;
          loader->setFileName(fileName);
          loader->load();
          aggregator_->loaderReady(loader);
      }
    }
    
  private:
    std::deque<QString> filenames_;
    QMutex filenamesMutex_;
    PreloadAggregator *aggregator_;
};

/**
 * @brief Defines the order in which plugins have to be loaded.
 *
 * First load all type Plugins to register the dataTypes to the core
 * Than load the file plugins to load objects
 * Next is textureControl to control texture based properties
 * Then load everything else.
 */
class PluginInitializationOrder {
    public:
        int getTypeOrdinal(const QString &name) const {
            const QString basename = QFileInfo(name).baseName();
            if (basename.contains("Plugin-Type"))
                return 0;
            else if (basename.contains("Plugin-File"))
                return 1;
            else if (basename.contains("TextureControl"))
                return 2;
            else
                return 3;

        }
        bool operator() (const QString &a, const QString &b) const {
            const int typeA = getTypeOrdinal(a);
            const int typeB = getTypeOrdinal(b);
            if (typeA != typeB) { return typeA < typeB; }
            return a < b;
        }

        bool operator() (const QPluginLoader *a, const QPluginLoader *b) const {
            return operator() (a->fileName(), b->fileName());
        }
};

//== IMPLEMENTATION ==========================================================


bool Core::checkSlot(QObject* _plugin , const char* _slotSignature) {
  const QMetaObject* meta = _plugin->metaObject();
  int id = meta->indexOfSlot( QMetaObject::normalizedSignature( _slotSignature ) );
  return ( id != -1 );
}

bool Core::checkSignal(QObject* _plugin , const char* _signalSignature) {
  const QMetaObject* meta = _plugin->metaObject();
  int id = meta->indexOfSignal( QMetaObject::normalizedSignature( _signalSignature ) );
  return ( id != -1 );
}

 /** Load plugins from dir Plugins. The plugin information gets stored, toolbox and menu entries are created and the required signals and slots are connected.
  */
void Core::loadPlugins()
{
  
  QString licenseTexts = "";
  
  //try to load plugins from new location
  QDir tempDir = QDir(OpenFlipper::Options::pluginDir());

  // Possible Plugin extensions
  // Windows gets DLLs
  // Mac and Linux use so
  // We don't use the dylib extension on Mac at the moment.
  QStringList filter;
  if ( OpenFlipper::Options::isWindows() )
    filter << "*.dll";
  else 
    filter << "*.so";
  
  // Get all files in the Plugin dir
  QStringList pluginlist = tempDir.entryList(filter,QDir::Files);

  // Convert local file path to absolute path
  for (int i=0; i < pluginlist.size(); i++) {
     pluginlist[i] = tempDir.absoluteFilePath(pluginlist[i]);
  }

  // get all Plugin Names which will not be loaded
  QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames", QStringList()).toStringList();
  
  // Output info about additional plugins
  for ( int i = 0 ; i < dontLoadPlugins.size(); ++i) 
    emit log(LOGOUT,tr("dontLoadPlugins Plugin from ini file: %1").arg( dontLoadPlugins[i] ) );
  
  // get all Plugins which should be loaded in addition to the standard plugins 
  QStringList additionalPlugins = OpenFlipperSettings().value("PluginControl/AdditionalPlugins", QStringList()).toStringList();
  
  // Output info about additional plugins
  for ( int i = 0 ; i < additionalPlugins.size(); ++i) {
    emit log(LOGOUT,tr("Additional Plugin from file: %1").arg( additionalPlugins[i] ) );
  }
  
  // Prepend the additional Plugins to the plugin list
  pluginlist = additionalPlugins << pluginlist;

  /*
   * Note: This call is not necessary, anymore. Initialization order
   * is determined later.
   */
  std::sort(pluginlist.begin(), pluginlist.end(), PluginInitializationOrder());

  for ( int i = 0 ; i < dontLoadPlugins.size(); ++i )
    emit log(LOGWARN,tr("Skipping Plugins :\t %1").arg( dontLoadPlugins[i] ) );

  emit log(LOGOUT,"================================================================================");

  QTime time;
  
  time.start();
  
  PreloadAggregator preloadAggregator;
  std::vector< PreloadThread* > loaderThreads(PRELOAD_THREADS_COUNT);

  /*
   * Initialize loaderThreads.
   */
  for (std::vector< PreloadThread* >::iterator it = loaderThreads.begin();
          it != loaderThreads.end(); ++it) {
      *it = new PreloadThread(&preloadAggregator);
  }
  
  /*
   * Distribute plugins onto loader threads in a round robin fashion.
   * (only load them in seperate thread. Instance will be created in main thread)
   */
  for ( int i = 0 ; i < pluginlist.size() ; ++i) {
    loaderThreads[i % loaderThreads.size()]->addFilename(pluginlist[i]);
  }

  /*
   * Start plugin preloading.
   */
  for (std::vector< PreloadThread* >::iterator it = loaderThreads.begin();
          it != loaderThreads.end(); ++it) {
      (*it)->start();
  }
  
  /*
   * Wait for the plugins to get preloaded
   */
  std::vector<QPluginLoader*> loadedPlugins;
  loadedPlugins.reserve(pluginlist.size());

  for (QPluginLoader *loader = preloadAggregator.waitForNextLoader(); loader != 0;
          loader = preloadAggregator.waitForNextLoader()) {

      loadedPlugins.push_back(loader);

      if ( OpenFlipper::Options::gui() && OpenFlipperSettings().value("Core/Gui/splash",true).toBool() ) {
        splashMessage_ = tr("Loading Plugin %1/%2").arg(loadedPlugins.size()).arg(pluginlist.size()) ;
        splash_->showMessage( splashMessage_ , Qt::AlignBottom | Qt::AlignLeft , Qt::white);
      }
  }

  /*
   * Finalize PreloadThreads.
   */
  for (std::vector< PreloadThread* >::iterator it = loaderThreads.begin();
          it != loaderThreads.end(); ++it) {
      (*it)->wait();
      delete *it;
  }

  /*
   * Initialize preloaded plugins in the correct order.
   */
  std::sort(loadedPlugins.begin(), loadedPlugins.end(), PluginInitializationOrder());
  for (std::vector<QPluginLoader*>::iterator it = loadedPlugins.begin();
          it != loadedPlugins.end(); ++it) {

      if ( OpenFlipper::Options::gui() && OpenFlipperSettings().value("Core/Gui/splash",true).toBool() ) {
        splashMessage_ = tr("Initializing Plugin %1/%2")
                .arg(std::distance(loadedPlugins.begin(), it) + 1)
                .arg(loadedPlugins.size());
        splash_->showMessage( splashMessage_ , Qt::AlignBottom | Qt::AlignLeft , Qt::white);
      }

      if ((*it)->instance() != 0 ) {
        QString pluginLicenseText  = "";
        loadPlugin((*it)->fileName(),true,pluginLicenseText, (*it)->instance());
        licenseTexts += pluginLicenseText;
      } else {
        emit log(LOGERR,tr("Unable to load Plugin :\t %1").arg( (*it)->fileName() ) );
        emit log(LOGERR,tr("Error was : ") + (*it)->errorString() );
        emit log(LOGOUT,"================================================================================");
      }
      delete *it;
  }

  emit log(LOGINFO, tr("Total time needed to load plugins was %1 ms.").arg(time.elapsed()));

  splashMessage_ = "";
  
  if ( licenseTexts != "" ) {
    if ( OpenFlipper::Options::gui() ) {
      
      // split for each license block
      QStringList licenseBlocks = licenseTexts.split("==");

      // Cleanup lists to get only the ones containing valid plugins.
      for ( QStringList::iterator it = licenseBlocks.begin(); it != licenseBlocks.end() ; ++it )
        if ( ! it->contains("PluginName") ) {
          licenseBlocks.erase(it);
          it = licenseBlocks.begin();
        }
      
      // sort by the contact mails
      QMap< QString , QString > contacts;
      
      for ( QStringList::iterator it = licenseBlocks.begin(); it != licenseBlocks.end() ; ++it ) {
        QStringList lines = it->split("\n");
        
        lines = lines.filter ( "Contact mail", Qt::CaseInsensitive );
        
        // Corect one found:
        if (lines.size() == 1)  {
          QString mail = lines[0].section(":",-1).simplified();
          QString list = contacts.take(mail);
          list.append(*it);
          contacts.insert(mail,list);
        } else {
          emit log(LOGWARN,tr("Can't extract mail contact from license request"));
        }
          
      }
      
      for ( QMap<QString , QString>::iterator it = contacts.begin() ; it != contacts.end() ; ++it ) {
        
        QStringList request = it.value().split("\n");
        
        // Cleanup lists to get only the relevant part
        for ( QStringList::iterator lit = request.begin(); lit != request.end() ; ++lit ) {
          
          if ( lit->contains("Message:")  ) {
            *lit = lit->section(":",-1).simplified();
          }
          
          if ( lit->contains("Contact mail:")  ) {
            *lit = lit->section(":",-1).simplified();
          }
           
        }

        QDialog licenseBox;
          
        QTextEdit *edit = new QTextEdit(&licenseBox);
        edit->setText(request.join("\n"));

        QLabel* mailLabel = new QLabel(&licenseBox);
        mailLabel->setText(tr("The text has been copied to your clipboard. Open in Mail program?"));

        QPushButton* noButton = new QPushButton(&licenseBox);
        noButton->setText(tr("No"));
        connect( noButton, SIGNAL(clicked ()), &licenseBox, SLOT(reject()) );

        QPushButton* yesButton = new QPushButton(&licenseBox);
        yesButton->setText(tr("Yes"));
        connect( yesButton, SIGNAL(clicked ()), &licenseBox, SLOT(accept()) );

        QGridLayout *layout = new QGridLayout;
        layout->addWidget(edit,0,0,1,2);
        layout->addWidget(mailLabel,1,0,1,2);
        layout->addWidget(noButton,2,0);
        layout->addWidget(yesButton,2,1);
        licenseBox.setLayout(layout);

        licenseBox.resize(500,500);
        licenseBox.setModal(true);
        licenseBox.setWindowTitle(tr("Plugin License check failed, issuer is: %1").arg( it.key() ));  
        int userAnswer =licenseBox.exec();

        // set a text to the Clipboard
        QClipboard *cb = QApplication::clipboard();
        cb->setText(request.join("\n"));

        if ( userAnswer == 1 ) {
           QString url = "mailto:" + it.key();
           url += "?subject=License Request&body=";
#ifdef WIN32
           url += request.join(";;");
#else
           url += request.join("\n");
#endif

           QUrl encodedURL(url, QUrl::TolerantMode);
           QDesktopServices::openUrl(encodedURL);
        }
        
      }

      
    } else {
      emit log(LOGWARN,tr("Plugin License check failed: "));
      std::cerr << licenseTexts.toStdString() << std::endl;
    }
  } 

  emit pluginsInitialized();

  emit log(LOGOUT,tr("Loaded %n Plugin(s)","",plugins_.size()) );
}

/** @brief slot for loading Plugins
 */
void Core::slotLoadPlugin(){

  if ( OpenFlipper::Options::nogui() )
    return;

  // Setup filters for possible plugin extensions
  // Windows gets DLLs
  // Mac and Linux use so
  // We don't use the dylib extension on Mac at the moment.
  QString filter;
  if ( OpenFlipper::Options::isWindows() )
    filter = "Plugins (*.dll)";
  else 
    filter = "Plugins (*.so)";

  // Ask the user to select the file to load
  QString filename = ACG::getOpenFileName(coreWidget_,tr("Load Plugin"),filter, OpenFlipperSettings().value("Core/CurrentDir").toString() );

  if (filename.isEmpty())
    return;

  // get the plugin name
  // and check if Plugin is in the dontLoad List
  QPluginLoader loader( filename );
  QObject *plugin = loader.instance();
  QString name;

  // Check if a plugin has been loaded
  if (plugin) {
    // Check if it is a BasePlugin
    BaseInterface* basePlugin = qobject_cast< BaseInterface * >(plugin);
    if ( basePlugin ) {
      name = basePlugin->name();
    }else
      return;
  }else
    return;

  // Ask if the plugin is on the block list
  QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames", QStringList()).toStringList();
  if (dontLoadPlugins.contains(name)){
      int ret = QMessageBox::question(0, tr("Plugin Loading Prevention"),
                   tr("OpenFlipper is currently configured to prevent loading this plugin.\n"
                      "Do you want to enable this plugin permanently?"),
                   QMessageBox::Yes | QMessageBox::No,
                   QMessageBox::Yes);
      if (ret == QMessageBox::Yes) {
        dontLoadPlugins.removeAll(name);
        OpenFlipperSettings().setValue("PluginControl/DontLoadNames",dontLoadPlugins);
      } else
         return;
  }
  
  // check if the plugin is not on the additional plugin list
  QStringList additionalPlugins = OpenFlipperSettings().value("PluginControl/AdditionalPlugins", QStringList()).toStringList();
  if (!additionalPlugins.contains(name)){
    int ret = QMessageBox::question(0, tr("Plugin Loading ..."),
                                       tr("Should OpenFlipper load this plugin on next startup?"),
                                    QMessageBox::Yes | QMessageBox::No,
                                    QMessageBox::Yes);
    if (ret == QMessageBox::Yes) {
      additionalPlugins << filename;
      std::cerr << "Added: " << filename.toStdString() << std::endl;
      OpenFlipperSettings().setValue("PluginControl/AdditionalPlugins",additionalPlugins);
    }
  }
  
  QString licenseText = "";
  loadPlugin(filename,false,licenseText);
  
  if ( licenseText != "" ) {
    if ( OpenFlipper::Options::gui() ) {
      QMessageBox::warning ( 0, tr("Plugin License check failed"),  licenseText );
      
      std::cerr << "OpenURL: " << std::endl;
      QDesktopServices::openUrl(QUrl(tr("mailto:contact@openflipper.com?subject=License Request&body=%1").arg(licenseText), QUrl::TolerantMode));
    } else {
      std::cerr << "Plugin License check failed" << std::endl;
      std::cerr << licenseText.toStdString() << std::endl;
    }
  }
}

/** @brief slot for showing loaded Plugins
 */
void Core::slotShowPlugins(){

  if ( OpenFlipper::Options::gui() ){

    int ret = 0;

    while (ret == 0){

      PluginDialog* dialog = new PluginDialog(plugins_, coreWidget_);

      //connect signals
      connect(dialog, SIGNAL(unloadPlugin(QString)), this, SLOT(unloadPlugin(QString)));
      connect(dialog, SIGNAL( loadPlugin() ), this, SLOT( slotLoadPlugin() ));

      //if a plugin was deleted/loaded the dialog returns 0 and it needs to be loaded again
      ret = dialog->exec();

      delete dialog;
    }
  }
}

/** @brief Unload a Plugin with given name (slot)
 *  @param name plugin name
 */
void Core::unloadPlugin(QString name){
  for (uint i=0; i < plugins_.size(); i++)
    if (plugins_[i].rpcName == name){
      if ( checkSlot( plugins_[i].plugin , "exit()" ) )
        QMetaObject::invokeMethod(plugins_[i].plugin, "exit",  Qt::DirectConnection);

      //remove toolbox widget
      QString name_nospace = name;
      name_nospace.remove(" ");
      if ( coreWidget_->viewModes_[0]->visibleToolboxes.contains(name_nospace) )
        coreWidget_->viewModes_[0]->visibleToolboxes.removeAt(coreWidget_->viewModes_[0]->visibleToolboxes.indexOf(name_nospace));
      for ( uint j = 0 ; j < plugins_[i].toolboxWidgets.size() ; ++j )
        if (plugins_[i].toolboxWidgets[j].second ){
          plugins_[i].toolboxWidgets[j].second->setVisible(false);
          delete plugins_[i].toolboxWidgets[j].second;

          if( plugins_[i].toolboxIcons[j] != 0 )
            delete plugins_[i].toolboxIcons[j];
        }

      plugins_.erase(plugins_.begin() + i);

      emit log(LOGOUT,tr("Unloaded Plugin :\t\t %1").arg( name) );

      return;
    }

    log(LOGERR, tr("Unable to unload plugin '%1' (plugin wasn't found)").arg(name));
}

/** @brief Load a Plugin with given filename
 *  @param filename complete path + filename of the plugin
 *  @param silent if 'true': user isn't asked what to do if a plugin is already loaded
 *  @param _licenseErrors String will be epty when no license issues occured, otherwise it contains the required information for obtaining a license
 *  @param _plugin You can provide a preloaded plugin here. If this is 0 the filename will be used to load the plugin.
 */
void Core::loadPlugin(QString filename, bool silent, QString& _licenseErrors, QObject* _plugin){

  _licenseErrors = "";
  
  // Only load .dll under windows
  if ( OpenFlipper::Options::isWindows() ) {
    QString dllname = filename;
    if ( ! dllname.endsWith( ".dll" ) )
      return;
  }

  // Only load .so under linux
  if ( OpenFlipper::Options::isLinux() ) {
    QString soname = filename;
    if ( ! soname.endsWith( ".so" ) )
      return;
  }

  // This will be the reference to our plugin
  QObject *plugin = 0;

  // Try to open the file if we did not get a plugin,
  // Otherwise use the supplied plugin pointer
  if ( _plugin == 0 ) {
    QPluginLoader loader( filename );
    plugin = loader.instance();  
    
    if ( !plugin) {
      emit log(LOGERR,tr("Unable to load Plugin :\t %1").arg( filename ) );
      emit log(LOGERR,tr("Error was : ") + loader.errorString() );
      emit log(LOGOUT,"================================================================================");       
    }
    
  } else {
      plugin = _plugin;
  }
  
  // Check if a plugin has been loaded
  PluginInfo info;
  QString supported;

  emit log(LOGOUT,tr("Location : \t %1").arg(filename) );
  
  // Check if it is a BasePlugin
  BaseInterface* basePlugin = qobject_cast< BaseInterface * >(plugin);
  if ( basePlugin ) {
    emit log(LOGOUT,tr("Found Plugin : \t %1").arg(basePlugin->name()) );

    if ( OpenFlipper::Options::gui() && OpenFlipperSettings().value("Core/Gui/splash",true).toBool() ) {
      splashMessage_ = splashMessage_ + " " + basePlugin->name() ;
      splash_->showMessage( splashMessage_ , Qt::AlignBottom | Qt::AlignLeft , Qt::white);
    }

    //Check if plugin is already loaded
    for (uint k=0; k < plugins_.size(); k++){

        QString name_nospace =  basePlugin->name();
        name_nospace.remove(" ");

        if (plugins_[k].name == name_nospace){
          if (silent || OpenFlipper::Options::nogui() ){ //dont load the plugin
            emit log(LOGWARN, tr("\t\t\t Already loaded from %1").arg( plugins_[k].path) );
            emit log(LOGOUT,"================================================================================");
            return;
        }else{ //ask the user
          int ret = QMessageBox::question(coreWidget_,
                                          tr("Plugin already loaded"),
                                          tr("A Plugin with the same name was already loaded from %1.\n" 
                                              "You can only load the new plugin if you unload the existing one first.\n\n"
                                              "Do you want to unload the existing plugin first?").arg( plugins_[k].path),
                                          QMessageBox::Yes|QMessageBox::No, QMessageBox::No);
          if (ret == QMessageBox::Yes)
            unloadPlugin(plugins_[k].name);
          else{
            emit log(LOGWARN, tr("\t\t\t Already loaded from %1.").arg( plugins_[k].path));
            emit log(LOGOUT,"================================================================================");
            return;
          }
        }
      }
    }

    QStringList dontLoadPlugins = OpenFlipperSettings().value("PluginControl/DontLoadNames",QStringList()).toStringList();
    
    if ( dontLoadPlugins.contains(basePlugin->name(), Qt::CaseInsensitive) ) {
      emit log(LOGWARN,tr("OpenFlipper.ini prevented Plugin %1 from being loaded! ").arg( basePlugin->name() ));
      emit log(LOGOUT,"================================================================================");
      return;
    }

    //Check if it is a BasePlugin
    SecurityInterface * securePlugin = qobject_cast< SecurityInterface * >(plugin);
    if ( securePlugin ) {
      emit log(LOGINFO,tr("Plugin uses security interface. Trying to authenticate against plugin ..."));

      bool success = false;
      QMetaObject::invokeMethod(plugin,"authenticate", Q_RETURN_ARG( bool , success ) ) ;
      
      QString message = "";
      QMetaObject::invokeMethod(plugin,"licenseError", Q_RETURN_ARG( QString , message ) ) ;
      _licenseErrors = message;

      if ( success )
        emit log(LOGINFO,tr("... ok. Loading plugin "));
      else {
        emit log(LOGERR,tr("... failed. Plugin access denied."));
        emit log(LOGOUT,"================================================================================");
        
        // Abort here, as the plugin will not do anything else until correct authentication.
        return;
      }
    }


    emit log(LOGOUT,tr("Plugin Desciption :\t %1 ").arg( basePlugin->description()) );

    supported = "BaseInterface ";

    info.name          = basePlugin->name();
    info.description   = basePlugin->description();
    info.plugin        = plugin;
    info.path          = filename;

    if ( checkSlot(plugin,"version()") )
      info.version = basePlugin->version();
    else
      info.version = QString::number(-1);

    if ( OpenFlipper::Options::nogui() ) {

      if ( ! checkSlot( plugin , "noguiSupported()" ) ) {
        emit log(LOGWARN,tr("Running in nogui mode which is unsupported by this plugin, skipping") );
        emit log(LOGOUT,"================================================================================");
        return;
      }

    }


    // Check for baseInterface of old style!
    if ( checkSignal(plugin,"updated_objects(int)") ) {
      log(LOGERR,tr("Plugin Uses old style updated_objects! Convert to updatedObject!"));
      emit log(LOGOUT,"================================================================================");
      return;
    }

    if ( checkSignal(plugin,"update_view()") ) {
      log(LOGERR,tr("Plugin Uses old style update_view! Convert to updateView!"));
      emit log(LOGOUT,"================================================================================");
      return;
    }

    if ( checkSignal(plugin,"updateView()") )
      connect(plugin,SIGNAL(updateView()),this,SLOT(updateView()));


    if ( checkSignal(plugin,"updatedObject(int)") && checkSignal(plugin,"updatedObject(int,const UpdateType&)") ){
      
      log(LOGERR,tr("Plugin uses deprecated and(!) new updatedObject. Only new updatedObject will be active."));
      connect(plugin,SIGNAL(updatedObject(int,const UpdateType&)),this,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
      
    } else {

      if ( checkSignal(plugin,"updatedObject(int)") ){
        log(LOGWARN,tr("Plugin uses deprecated updatedObject."));
        connect(plugin,SIGNAL(updatedObject(int)),this,SLOT(slotObjectUpdated(int)), Qt::DirectConnection);
      }

      if ( checkSignal(plugin,"updatedObject(int,const UpdateType&)") )
        connect(plugin,SIGNAL(updatedObject(int,const UpdateType&)),this,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
    }

    if ( checkSlot( plugin , "slotObjectUpdated(int)" ) && checkSlot( plugin , "slotObjectUpdated(int,const UpdateType&)" ) ){
      
      log(LOGERR,tr("Plugin uses deprecated and(!) new slotObjectUpdated. Only new slotObjectUpdated will be active."));
      connect(this,SIGNAL(signalObjectUpdated(int,const UpdateType&)),plugin,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
    
    } else {

      if ( checkSlot( plugin , "slotObjectUpdated(int)" ) ){
        log(LOGWARN,tr("Plugin uses deprecated slotObjectUpdated."));
        connect(this,SIGNAL(signalObjectUpdated(int)),plugin,SLOT(slotObjectUpdated(int)), Qt::DirectConnection);
      }

      if ( checkSlot( plugin , "slotObjectUpdated(int,const UpdateType&)" ) )
        connect(this,SIGNAL(signalObjectUpdated(int,const UpdateType&)),plugin,SLOT(slotObjectUpdated(int,const UpdateType&)), Qt::DirectConnection);
    }

    if ( checkSignal(plugin,"objectPropertiesChanged(int)")) {
      emit log (LOGERR,tr("Signal objectPropertiesChanged(int) is deprecated. " ));
      emit log (LOGERR,tr("The signal will be automatically emitted by the object that has been changed and the core will deliver it to the plugins!. "));
      emit log (LOGERR,tr("Please remove this signal from your plugins!. "));
    }
    
    if ( checkSlot( plugin , "slotViewChanged()" ) )
      connect(this,SIGNAL(pluginViewChanged()),plugin,SLOT(slotViewChanged()), Qt::DirectConnection);

    if ( checkSlot( plugin , "slotSceneDrawn()" ) )
      connect(this,SIGNAL(pluginSceneDrawn()),plugin,SLOT(slotSceneDrawn()), Qt::DirectConnection);

    if ( checkSlot( plugin , "slotDrawModeChanged(int)" ) )
          connect(coreWidget_,SIGNAL(drawModeChanged(int)),plugin,SLOT(slotDrawModeChanged(int)), Qt::DirectConnection);

    if ( checkSlot(plugin,"slotObjectPropertiesChanged(int)"))
      connect(this,SIGNAL(objectPropertiesChanged(int)),plugin,SLOT(slotObjectPropertiesChanged(int)), Qt::DirectConnection);

    if ( checkSignal(plugin,"visibilityChanged()" ) )
      emit log (LOGERR,tr("Signal visibilityChanged() now requires objectid or -1 as argument " ));

    if ( checkSignal(plugin,"visibilityChanged(int)") ) {
      emit log (LOGERR,tr("Signal visibilityChanged(int) is deprecated! " ));
      emit log (LOGERR,tr("If an object changes its visibility, it will call the required functions automatically." ));
      emit log (LOGERR,tr("If you change a scenegraph node, call nodeVisibilityChanged(int). See docu of this function for details." ));
    }
    
    if ( checkSignal(plugin,"nodeVisibilityChanged(int)") )
      connect(plugin,SIGNAL(nodeVisibilityChanged(int)),this,SLOT(slotVisibilityChanged(int)), Qt::DirectConnection);
    

    if ( checkSlot(plugin,"slotVisibilityChanged(int)") )
      connect(this,SIGNAL(visibilityChanged(int)),plugin,SLOT(slotVisibilityChanged(int)), Qt::DirectConnection);

    if ( checkSignal(plugin,"activeObjectChanged()" ) )
      emit log (LOGERR,tr("Signal activeObjectChanged() is now objectSelectionChanged( int _objectId ) ") );

    if ( checkSlot(plugin,"slotActiveObjectChanged()" ) )
      emit log (LOGERR,tr("Slot slotActiveObjectChanged() is now slotObjectSelectionChanged( int _objectId ) ") );

    if ( checkSlot(plugin,"slotAllCleared()") )
      connect(this,SIGNAL(allCleared()),plugin,SLOT(slotAllCleared()));


    if ( checkSignal(plugin,"objectSelectionChanged(int)") ) {
      emit log (LOGERR,tr("Signal objectSelectionChanged(in) is deprecated!") );
      emit log (LOGERR,tr("If the selection for an object is changed, the core will emit the required signals itself!") );
    }

    if ( checkSlot( plugin , "slotObjectSelectionChanged(int)" ) )
      connect(this,SIGNAL(objectSelectionChanged(int)),plugin,SLOT(slotObjectSelectionChanged(int) ), Qt::DirectConnection);


    if ( checkSlot( plugin , "pluginsInitialized()" ) )
      connect(this,SIGNAL(pluginsInitialized()),plugin,SLOT(pluginsInitialized()), Qt::DirectConnection);

    if ( checkSignal(plugin,"setSlotDescription(QString,QString,QStringList,QStringList)") )
      connect(plugin, SIGNAL(setSlotDescription(QString,QString,QStringList,QStringList)),
              this,   SLOT(slotSetSlotDescription(QString,QString,QStringList,QStringList)) );

    // =============================================
    // Function allowing switching of renderers from other plugins
    // =============================================
    if ( checkSignal(plugin,"setRenderer(unsigned int,QString)" ) ) {
      connect(plugin,SIGNAL(setRenderer(unsigned int,QString)),this,SLOT(slotSetRenderer(unsigned int,QString)));
    }

    if ( checkSignal(plugin,"getCurrentRenderer(unsigned int,QString&)" ) ) {
      connect(plugin,SIGNAL(getCurrentRenderer(unsigned int,QString&)),this,SLOT(slotGetCurrentRenderer(unsigned int,QString&)), Qt::DirectConnection);
    }


  }

  //Check if the plugin supports Logging
  LoggingInterface* logPlugin = qobject_cast< LoggingInterface * >(plugin);
  if ( logPlugin ) {
    supported = supported + "Logging ";

    // Create intermediate logger class which will mangle the output
    PluginLogger* newlog = new PluginLogger(info.name);
    loggers_.push_back(newlog);
    connect(plugin,SIGNAL(log(Logtype, QString )),newlog,SLOT(slotLog(Logtype, QString )),Qt::DirectConnection);
    connect(plugin,SIGNAL(log(QString )),newlog,SLOT(slotLog(QString )),Qt::DirectConnection);

    // Connect it to the core widget logger
    if ( OpenFlipper::Options::gui() )
      connect(newlog,SIGNAL(log(Logtype, QString )),coreWidget_,SLOT(slotLog(Logtype, QString )),Qt::DirectConnection);

    // connection to console logger
    connect(newlog,SIGNAL(log(Logtype, QString )),this,SLOT(slotLog(Logtype, QString )),Qt::DirectConnection);

    // connection to file logger
    connect(newlog,SIGNAL(log(Logtype, QString )),this,SLOT(slotLogToFile(Logtype, QString )),Qt::DirectConnection);

    // connection to external plugin logger
    if ( checkSlot(plugin,"logOutput(Logtype,QString)") )
      connect(this,SIGNAL(externalLog(Logtype,QString)), plugin, SLOT(logOutput(Logtype,QString)) ) ;
  }

  //Check if the plugin supports Menubar-Interface
  MenuInterface* menubarPlugin = qobject_cast< MenuInterface * >(plugin);
  if ( menubarPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "Menubar ";

    if ( checkSignal(plugin,"addMenubarAction(QAction*,QString)") )
      connect(plugin      , SIGNAL(addMenubarAction(QAction*,QString)),
              coreWidget_ , SLOT(slotAddMenubarAction(QAction*,QString)),Qt::DirectConnection);
    if ( checkSignal(plugin,"getMenubarMenu (QString,QMenu*&,bool)") )
      connect(plugin      , SIGNAL(getMenubarMenu (QString,QMenu*&,bool)),
              coreWidget_ , SLOT(slotGetMenubarMenu (QString,QMenu*&,bool)),Qt::DirectConnection);
  }

  //Check if the plugin supports ContextMenuInterface
  ContextMenuInterface* contextMenuPlugin = qobject_cast< ContextMenuInterface * >(plugin);
  if ( contextMenuPlugin && OpenFlipper::Options::gui() ) {
    supported = supported + "ContextMenu ";

    if ( checkSignal(plugin,"addContextMenuItem(QAction*,ContextMenuType)") )
      connect(plugin      , SIGNAL(addContextMenuItem(QAction*,ContextMenuType)),
              coreWidget_ , SLOT(slotAddContextItem(QAction*,ContextMenuType)),Qt::DirectConnection);

    if ( checkSignal(plugin,"addContextMenuItem(QAction*,DataType,ContextMenuType)") )
      connect(plugin      , SIGNAL(addContextMenuItem(QAction*,DataType,ContextMenuType)),
              coreWidget_ , SLOT(slotAddContextItem(QAction*,DataType,ContextMenuType)),Qt::DirectConnection);