content: package act.plugin;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.Destroyable;
  import act.util.LogSupportedDestroyableBase;
  import org.osgl.util.C;
  
  import java.util.*;
  
  public class GenericPluginManager extends LogSupportedDestroyableBase {
      private Map<Class<?>, List<?>> registry = new HashMap<>();
  
      @Override
      protected void releaseResources() {
          for (List<?> pluginList : registry.values()) {
              for (Object plugin: pluginList) {
                  if (plugin instanceof Destroyable) {
                      ((Destroyable) plugin).destroy();
                  }
              }
          }
          registry.clear();
      }
  
      public synchronized <CT, ET extends CT> GenericPluginManager register(Class<CT> clazz, ET plugin) {
          List pluginList = registry.get(clazz);
          if (null == pluginList) {
              pluginList = new ArrayList<>();
              registry.put(clazz, pluginList);
          }
          pluginList.add(plugin);
          return this;
      }
  
      public <T> List<T> pluginList(Class<T> pluginClass) {
          List<T> list = (List<T>)registry.get(pluginClass);
          return null == list ? C.<T>list() : C.<T>list(list);
      }
  
  }
  