multi_library_class_loader.cpp

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/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include "class_loader/multi_library_class_loader.h"

namespace class_loader
{

MultiLibraryClassLoader::MultiLibraryClassLoader(bool enable_ondemand_loadunload) :
enable_ondemand_loadunload_(enable_ondemand_loadunload)
{
}

MultiLibraryClassLoader::~MultiLibraryClassLoader()
{
  shutdownAllClassLoaders();
}

std::vector<std::string> MultiLibraryClassLoader::getRegisteredLibraries()
{
  std::vector<std::string> libraries;
  for(LibraryToClassLoaderMap::iterator itr = active_class_loaders_.begin(); itr != active_class_loaders_.end(); itr++)
  {
    if(itr->second != NULL)
      libraries.push_back(itr->first);
  }
  return(libraries);
}

ClassLoader* MultiLibraryClassLoader::getClassLoaderForLibrary(const std::string& library_path)
{
  return(active_class_loaders_[library_path]);
}

ClassLoaderVector MultiLibraryClassLoader::getAllAvailableClassLoaders()
{
  ClassLoaderVector loaders;
  for(LibraryToClassLoaderMap::iterator itr = active_class_loaders_.begin(); itr != active_class_loaders_.end(); itr++)
    loaders.push_back(itr->second);
  return(loaders);
}

bool MultiLibraryClassLoader::isLibraryAvailable(const std::string& library_name)
{
  std::vector<std::string> available_libraries = getRegisteredLibraries();
  return(available_libraries.end() != std::find(available_libraries.begin(), available_libraries.end(), library_name));
}

void MultiLibraryClassLoader::loadLibrary(const std::string& library_path)
{
  if(!isLibraryAvailable(library_path))
    active_class_loaders_[library_path] = new class_loader::ClassLoader(library_path, isOnDemandLoadUnloadEnabled());
}

void MultiLibraryClassLoader::shutdownAllClassLoaders()
{
  std::vector<std::string> available_libraries = getRegisteredLibraries();
  for(unsigned int c = 0; c < available_libraries.size(); c++)
    unloadLibrary(available_libraries.at(c));
}

int MultiLibraryClassLoader::unloadLibrary(const std::string& library_path)
{
  int remaining_unloads = 0;
  if(isLibraryAvailable(library_path))
  {
    ClassLoader* loader = getClassLoaderForLibrary(library_path);
    if((remaining_unloads = loader->unloadLibrary()) == 0)
    {
      active_class_loaders_[library_path] = NULL;
      delete(loader);
    }
  }
  return(remaining_unloads);
}

}