Plugin.C

Go to the documentation of this file.
00001 /*!@file Component/Plugin.C */
00002 
00003 // //////////////////////////////////////////////////////////////////// //
00004 // The iLab Neuromorphic Vision C++ Toolkit - Copyright (C) 2000-2005   //
00005 // by the University of Southern California (USC) and the iLab at USC.  //
00006 // See http://iLab.usc.edu for information about this project.          //
00007 // //////////////////////////////////////////////////////////////////// //
00008 // Major portions of the iLab Neuromorphic Vision Toolkit are protected //
00009 // under the U.S. patent ``Computation of Intrinsic Perceptual Saliency //
00010 // in Visual Environments, and Applications'' by Christof Koch and      //
00011 // Laurent Itti, California Institute of Technology, 2001 (patent       //
00012 // pending; application number 09/912,225 filed July 23, 2001; see      //
00013 // http://pair.uspto.gov/cgi-bin/final/home.pl for current status).     //
00014 // //////////////////////////////////////////////////////////////////// //
00015 // This file is part of the iLab Neuromorphic Vision C++ Toolkit.       //
00016 //                                                                      //
00017 // The iLab Neuromorphic Vision C++ Toolkit is free software; you can   //
00018 // redistribute it and/or modify it under the terms of the GNU General  //
00019 // Public License as published by the Free Software Foundation; either  //
00020 // version 2 of the License, or (at your option) any later version.     //
00021 //                                                                      //
00022 // The iLab Neuromorphic Vision C++ Toolkit is distributed in the hope  //
00023 // that it will be useful, but WITHOUT ANY WARRANTY; without even the   //
00024 // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      //
00025 // PURPOSE.  See the GNU General Public License for more details.       //
00026 //                                                                      //
00027 // You should have received a copy of the GNU General Public License    //
00028 // along with the iLab Neuromorphic Vision C++ Toolkit; if not, write   //
00029 // to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,   //
00030 // Boston, MA 02111-1307 USA.                                           //
00031 // //////////////////////////////////////////////////////////////////// //
00032 //
00033 // Primary maintainer for this file: Rob Peters <rjpeters at usc dot edu>
00034 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/Component/Plugin.C $
00035 // $Id: Plugin.C 7425 2006-11-09 23:46:58Z rjpeters $
00036 //
00037 
00038 #ifndef COMPONENT_PLUGIN_C_DEFINED
00039 #define COMPONENT_PLUGIN_C_DEFINED
00040 
00041 #include "Component/Plugin.H"
00042 
00043 #include "Util/StringUtil.H" // for toLowerCase()
00044 #include "Util/log.H"
00045 #include "Util/sformat.H"
00046 
00047 #include <dlfcn.h>
00048 
00049 bool loadPlugin(OptionManager* mgr,
00050                 const char* realm, const char* name)
00051 {
00052   const std::string soname = sformat("%s/%s/%s.so",
00053                                      INVT_PLUGIN_DIR, realm, name);
00054 
00055   const std::string initname =
00056     toLowerCase(sformat("%s_%s_init", realm, name));
00057 
00058   LDEBUG("opening %s", soname.c_str());
00059 
00060   // open the shared object with RTLD_LAZY -- this means don't resolve
00061   // all symbols now, which makes the dlopen() faster, but also makes
00062   // errors asynchronous
00063 
00064   void* const handle = dlopen(soname.c_str(), RTLD_LAZY);
00065   const char* err = dlerror();
00066   if (err != 0)
00067     {
00068       LDEBUG("dlopen() failed: %s", err);
00069       return false;
00070     }
00071 
00072   LDEBUG("looking for %s() in %s", initname.c_str(), soname.c_str());
00073 
00074   void* const sym = dlsym(handle, initname.c_str());
00075   err = dlerror();
00076   if (err != 0)
00077     {
00078       LDEBUG("dlsym() failed: %s", err);
00079       dlclose(handle);
00080       return false;
00081     }
00082 
00083   PluginInitFunc* f = (PluginInitFunc*)(sym);
00084 
00085   const int status = (*f)(mgr);
00086 
00087   if (status == 0)
00088     LINFO("loaded %s/%s plugin (from %s)",
00089           realm, name, soname.c_str());
00090   else
00091     LERROR("%s/%s plugin initialization failed (from %s)",
00092            realm, name, soname.c_str());
00093 
00094   return (status == 0);
00095 }
00096 
00097 PluginFallback::PluginFallback(OptionManager* mgr, const char* realm)
00098   :
00099   itsManager(mgr),
00100   itsRealm(realm)
00101 {}
00102 
00103 PluginFallback::~PluginFallback() throw() {}
00104 
00105 void PluginFallback::try_fallback(const rutz::fstring& key) const
00106 {
00107   loadPlugin(itsManager, itsRealm, key.c_str());
00108 }
00109 
00110 // ######################################################################
00111 /* So things look consistent in everyone's emacs... */
00112 /* Local Variables: */
00113 /* mode: c++ */
00114 /* indent-tabs-mode: nil */
00115 /* End: */
00116 
00117 #endif // COMPONENT_PLUGIN_C_DEFINED
Generated on Sun May 8 08:40:23 2011 for iLab Neuromorphic Vision Toolkit by  doxygen 1.6.3