content: package act.handler.builtin;
  
  /*-
   * #%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.ActionContext;
  import act.conf.AppConfig;
  import act.handler.ExpressHandler;
  import act.handler.UnknownHttpMethodProcessor;
  import act.handler.builtin.controller.FastRequestHandler;
  import act.handler.builtin.controller.RequestHandlerProxy;
  import act.view.ActErrorResult;
  import org.osgl.http.H;
  import org.osgl.logging.LogManager;
  import org.osgl.logging.Logger;
  import org.osgl.mvc.result.Result;
  
  import java.io.Serializable;
  
  public class UnknownHttpMethodHandler extends FastRequestHandler implements Serializable {
  
      private static Logger logger = LogManager.get(UnknownHttpMethodHandler.class);
      public static final UnknownHttpMethodHandler INSTANCE = new UnknownHttpMethodHandler();
  
      private volatile UnknownHttpMethodProcessor configured;
  
      @Override
      public void handle(ActionContext context) {
          H.Method method = context.req().method();
          Result result = configured(context.config()).handle(method);
          try {
              result = RequestHandlerProxy.GLOBAL_AFTER_INTERCEPTOR.apply(result, context);
          } catch (Exception e) {
              logger.error(e, "Error calling global after interceptor");
              result = ActErrorResult.of(e);
          }
          result.apply(context.req(), context.prepareRespForResultEvaluation());
      }
  
      @Override
      public String toString() {
          return "unknown http method handler: " + configured(Act.appConfig()).getClass().getSimpleName();
      }
  
      @Override
      public boolean express(ActionContext context) {
          return configured(null) instanceof ExpressHandler;
      }
  
      @Override
      public boolean skipEvents(ActionContext context) {
          return true;
      }
  
      private UnknownHttpMethodProcessor configured(AppConfig config) {
          if (null == configured) {
              synchronized (this) {
                  if (null == configured) {
                      if (null == config) {
                          config = Act.appConfig();
                      }
                      configured = config.unknownHttpMethodProcessor();
                  }
              }
          }
          return configured;
      }
  
      private Object readResolve() {
          return INSTANCE;
      }
  }
  