multi_library_class_loader.cpp
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00001 /*
00002  * Copyright (c) 2012, Willow Garage, Inc.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions are met:
00007  *
00008  *     * Redistributions of source code must retain the above copyright
00009  *       notice, this list of conditions and the following disclaimer.
00010  *     * Redistributions in binary form must reproduce the above copyright
00011  *       notice, this list of conditions and the following disclaimer in the
00012  *       documentation and/or other materials provided with the distribution.
00013  *     * Neither the name of the Willow Garage, Inc. nor the names of its
00014  *       contributors may be used to endorse or promote products derived from
00015  *       this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00021  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00022  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00023  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00026  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00027  * POSSIBILITY OF SUCH DAMAGE.
00028  */
00029 
00030 #include "class_loader/multi_library_class_loader.hpp"
00031 
00032 #include <string>
00033 #include <vector>
00034 
00035 namespace class_loader
00036 {
00037 
00038 MultiLibraryClassLoader::MultiLibraryClassLoader(bool enable_ondemand_loadunload)
00039 : enable_ondemand_loadunload_(enable_ondemand_loadunload)
00040 {
00041 }
00042 
00043 MultiLibraryClassLoader::~MultiLibraryClassLoader()
00044 {
00045   shutdownAllClassLoaders();
00046 }
00047 
00048 std::vector<std::string> MultiLibraryClassLoader::getRegisteredLibraries()
00049 {
00050   std::vector<std::string> libraries;
00051   for (
00052     LibraryToClassLoaderMap::iterator itr = active_class_loaders_.begin();
00053     itr != active_class_loaders_.end(); itr++)
00054   {
00055     libraries.push_back(itr->first);
00056   }
00057   return libraries;
00058 }
00059 
00060 ClassLoader * MultiLibraryClassLoader::getClassLoaderForLibrary(const std::string & library_path)
00061 {
00062   LibraryToClassLoaderMap::iterator itr = active_class_loaders_.find(library_path);
00063   if (itr != active_class_loaders_.end()) {
00064     return itr->second;
00065   } else {return NULL;}
00066 }
00067 
00068 ClassLoaderVector MultiLibraryClassLoader::getAllAvailableClassLoaders()
00069 {
00070   ClassLoaderVector loaders;
00071   for (
00072     LibraryToClassLoaderMap::iterator itr = active_class_loaders_.begin();
00073     itr != active_class_loaders_.end(); itr++)
00074   {
00075     loaders.push_back(itr->second);
00076   }
00077   return loaders;
00078 }
00079 
00080 bool MultiLibraryClassLoader::isLibraryAvailable(const std::string & library_name)
00081 {
00082   return getClassLoaderForLibrary(library_name) != NULL;
00083 }
00084 
00085 void MultiLibraryClassLoader::loadLibrary(const std::string & library_path)
00086 {
00087   if (!isLibraryAvailable(library_path)) {
00088     active_class_loaders_[library_path] =
00089       new class_loader::ClassLoader(library_path, isOnDemandLoadUnloadEnabled());
00090   }
00091 }
00092 
00093 void MultiLibraryClassLoader::shutdownAllClassLoaders()
00094 {
00095   std::vector<std::string> available_libraries = getRegisteredLibraries();
00096   for (unsigned int c = 0; c < available_libraries.size(); c++) {
00097     unloadLibrary(available_libraries.at(c));
00098   }
00099 }
00100 
00101 int MultiLibraryClassLoader::unloadLibrary(const std::string & library_path)
00102 {
00103   int remaining_unloads = 0;
00104   LibraryToClassLoaderMap::iterator itr = active_class_loaders_.find(library_path);
00105   if (itr != active_class_loaders_.end()) {
00106     ClassLoader * loader = itr->second;
00107     if (0 == (remaining_unloads = loader->unloadLibrary())) {
00108       delete (loader);
00109       active_class_loaders_.erase(itr);
00110     }
00111   }
00112   return remaining_unloads;
00113 }
00114 
00115 }  // namespace class_loader


class_loader
Author(s): Mirza Shah
autogenerated on Mon Oct 22 2018 05:20:55