content: /*
   * Copyright 1999-2018 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.nacos.config.server.exception;
  
  import com.alibaba.nacos.config.server.monitor.MetricsMonitor;
  import org.springframework.dao.DataAccessException;
  import org.springframework.jdbc.CannotGetJdbcConnectionException;
  import org.springframework.web.bind.annotation.ControllerAdvice;
  import org.springframework.web.bind.annotation.ExceptionHandler;
  
  import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  
  /**
   * global exception handler
   *
   * @author Nacos
   */
  @ControllerAdvice
  public class GlobalExceptionHandler {
  
      /**
       * For IllegalArgumentException, we are returning void with status code as 400, so our error-page will be used in
       * this case.
       *
       * @throws IllegalArgumentException
       */
      @ExceptionHandler(IllegalArgumentException.class)
      public void handleIllegalArgumentException(HttpServletResponse response, Exception ex) throws IOException {
          MetricsMonitor.getIllegalArgumentException().increment();
          response.setStatus(400);
          if (ex.getMessage() != null) {
              response.getWriter().println(ex.getMessage());
          } else {
              response.getWriter().println("invalid param");
          }
      }
  
      /**
       * For NacosException
       *
       * @throws NacosException
       */
      @ExceptionHandler(NacosException.class)
      public void handleNacosException(HttpServletResponse response, NacosException ex) throws IOException {
          MetricsMonitor.getNacosException().increment();
          response.setStatus(ex.getErrCode());
          if (ex.getErrMsg() != null) {
              response.getWriter().println(ex.getErrMsg());
          } else {
              response.getWriter().println("unknown exception");
          }
      }
  
      /**
       * For DataAccessException
       *
       * @throws DataAccessException
       */
      @ExceptionHandler(DataAccessException.class)
      public void handleDataAccessException(HttpServletResponse response, DataAccessException ex) throws DataAccessException {
          MetricsMonitor.getDbException().increment();
          throw new CannotGetJdbcConnectionException(ex.getMessage());
      }
  
  }
  