content: package act.handler.builtin.controller;
  
  /*-
   * #%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.annotations.Order;
  import act.security.CORS;
  import act.util.LogSupportedDestroyableBase;
  import act.util.Ordered;
  
  /**
   * The base class of @Before, @After, @Exception, @Finally interceptor and
   * request dispatcher
   */
  public abstract class Handler<T extends Handler> extends LogSupportedDestroyableBase implements Ordered {
  
      private Integer priority;
  
      protected Handler(Integer priority) {
          this.priority = priority;
      }
  
      public Integer priority() {
          return priority;
      }
  
      @Override
      public int order() {
          return null == priority ? Order.HIGHEST_PRECEDENCE : priority;
      }
  
      public void accept(Visitor visitor) {}
  
      public abstract boolean sessionFree();
  
      public abstract boolean express();
  
      public abstract boolean skipEvents();
  
      public interface Visitor {
          ActionHandlerInvoker.Visitor invokerVisitor();
      }
  
      @Override
      protected void releaseResources() {
      }
  
      public abstract CORS.Spec corsSpec();
  
  }
  