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   /*
    * Copyright 2015 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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 io.netty.resolver;
  
  import io.netty.util.internal.SocketUtils;
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.concurrent.Promise;
  
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * A {@link InetNameResolver} that resolves using JDK's built-in domain name lookup mechanism.
   * Note that this resolver performs a blocking name lookup from the caller thread.
   */
  public class DefaultNameResolver extends InetNameResolver {
  
      public DefaultNameResolver(EventExecutor executor) {
          super(executor);
      }
  
      @Override
      protected void doResolve(String inetHost, Promise<InetAddress> promise) throws Exception {
          try {
              promise.setSuccess(SocketUtils.addressByName(inetHost));
          } catch (UnknownHostException e) {
              promise.setFailure(e);
          }
      }
  
      @Override
      protected void doResolveAll(String inetHost, Promise<List<InetAddress>> promise) throws Exception {
          try {
              promise.setSuccess(Arrays.asList(SocketUtils.allAddressesByName(inetHost)));
          } catch (UnknownHostException e) {
              promise.setFailure(e);
          }
      }
  }