content: /*
   * Copyright 1999-2019 Alibaba Group Holding Ltd.
   *
   * 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.
   */
  package com.alibaba.csp.sentinel.demo.spring.webmvc.controller;
  
  import java.util.Random;
  import java.util.concurrent.TimeUnit;
  
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.ResponseBody;
  import org.springframework.web.context.request.async.DeferredResult;
  import org.springframework.web.servlet.ModelAndView;
  
  /**
   * Test controller
   *
   * @author kaizi2009
   */
  @Controller
  public class WebMvcTestController {
  
      @GetMapping("/hello")
      @ResponseBody
      public String apiHello() {
          doBusiness();
          return "Hello!";
      }
  
      @GetMapping("/err")
      @ResponseBody
      public String apiError() {
          doBusiness();
          return "Oops...";
      }
  
      @GetMapping("/foo/{id}")
      @ResponseBody
      public String apiFoo(@PathVariable("id") Long id) {
          doBusiness();
          return "Hello " + id;
      }
  
      @GetMapping("/exclude/{id}")
      @ResponseBody
      public String apiExclude(@PathVariable("id") Long id) {
          doBusiness();
          return "Exclude " + id;
      }
  
      @GetMapping("/forward")
      public ModelAndView apiForward() {
          ModelAndView mav = new ModelAndView();
          mav.setViewName("hello");
          return mav;
      }
  
      @GetMapping("/async")
      @ResponseBody
      public DeferredResult<String> distribute() throws Exception {
          DeferredResult<String> result = new DeferredResult<>(4000L);
  
          Thread thread = new Thread(() -> result.setResult("async result"));
          thread.start();
  
          return result;
      }
  
      private void doBusiness() {
          Random random = new Random(1);
          try {
              TimeUnit.MILLISECONDS.sleep(random.nextInt(100));
          } catch (InterruptedException e) {
              e.printStackTrace();
          }
      }
  
  }
  