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.Act;
  import org.osgl.$;
  import org.osgl.exception.UnexpectedException;
  import org.osgl.logging.L;
  import org.osgl.logging.Logger;
  
  import java.util.List;
  
  /**
   * Responsible for scanning/loading Act server plugins.
   * <p>A server plugin shall be packaged in jar file and put into
   * <code>${ACT_HOME}/plugin folder</code></p>
   */
  public class PluginScanner {
  
      private static final Logger logger = L.get(PluginScanner.class);
  
      public PluginScanner() {
      }
  
      public int scan() {
          Plugin.InfoRepo.clear();
          List<Class<?>> pluginClasses = Act.pluginClasses();
          int sz = pluginClasses.size();
          for (int i = 0; i < sz; ++i) {
              Class<?> c = pluginClasses.get(i);
              try {
                  Plugin p = (Plugin) $.newInstance(c);
                  Plugin.InfoRepo.register(p);
              } catch (UnexpectedException e) {
                  // ignore: some plugin does not provide default constructor
                  logger.warn(e, "failed to register plugin: %s", c);
              }
          }
          return sz;
      }
  
      public void unload() {
          Plugin.InfoRepo.clear();
      }
  
  }
  