content: package act.db;
  
  /*-
   * #%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 act.app.App;
  import act.db.meta.MasterEntityMetaInfoRepo;
  import act.plugin.AppServicePlugin;
  import act.plugin.Plugin;
  import org.osgl.util.C;
  
  import java.lang.annotation.Annotation;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * The base class for Database Plugin
   */
  public abstract class DbPlugin extends AppServicePlugin implements Plugin {
  
      @Override
      public void register() {
          super.register();
          Act.dbManager().register(this);
          Act.trigger(new DbPluginRegistered(this));
      }
  
      /**
       * Sub class to override this method to return a set
       * of annotation classes that marks on an entity(model) class
       * @return entity class annotations
       */
      public Set<Class<? extends Annotation>> entityAnnotations() {
          return C.set();
      }
  
      @Override
      public int hashCode() {
          return getClass().hashCode();
      }
  
      @Override
      protected void applyTo(App app) {
          Set<Class<? extends Annotation>> entityAnnotations = entityAnnotations();
          if (!entityAnnotations.isEmpty()) {
              MasterEntityMetaInfoRepo repo = app.entityMetaInfoRepo();
              for (Class<? extends Annotation> annoType : entityAnnotations) {
                  repo.registerEntityAnnotation(annoType);
              }
          }
      }
  
      @Override
      public boolean equals(Object obj) {
          return obj == this || null != obj && getClass() == obj.getClass();
      }
  
      public abstract DbService initDbService(String id, App app, Map<String, String> conf);
  
  }
  