class_loader.cc

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/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/
#include "cyber/class_loader/class_loader.h"
 
namespace apollo {
namespace cyber {
namespace class_loader {
ClassLoader::ClassLoader(const std::string& library_path)
    : library_path_(library_path),
      loadlib_ref_count_(0),
      classobj_ref_count_(0) {
  LoadLibrary();
}
 
ClassLoader::~ClassLoader() { UnloadLibrary(); }
 
bool ClassLoader::IsLibraryLoaded() {
  return utility::IsLibraryLoaded(library_path_, this);
}
 
bool ClassLoader::LoadLibrary() {
  std::lock_guard<std::mutex> lck(loadlib_ref_count_mutex_);
  ++loadlib_ref_count_;
  AINFO << "Begin LoadLibrary: " << library_path_;
  return utility::LoadLibrary(library_path_, this);
}
 
int ClassLoader::UnloadLibrary() {
  std::lock_guard<std::mutex> lckLib(loadlib_ref_count_mutex_);
  std::lock_guard<std::mutex> lckObj(classobj_ref_count_mutex_);
 
  if (classobj_ref_count_ > 0) {
    AINFO << "There are still classobjs have not been deleted, "
             "classobj_ref_count_: "
          << classobj_ref_count_;
  } else {
    --loadlib_ref_count_;
    if (loadlib_ref_count_ == 0) {
      utility::UnloadLibrary(library_path_, this);
    } else {
      if (loadlib_ref_count_ < 0) {
        loadlib_ref_count_ = 0;
      }
    }
  }
  return loadlib_ref_count_;
}
 
const std::string ClassLoader::GetLibraryPath() const { return library_path_; }
 
}  // namespace class_loader
}  // namespace cyber
}  // namespace apollo