查看本类的 API文档回源码主页

   /*
    * Copyright 2019 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.dns;
  
  import io.netty.channel.AddressedEnvelope;
  import io.netty.channel.Channel;
  import io.netty.handler.codec.dns.DefaultDnsQuery;
  import io.netty.handler.codec.dns.DnsQuery;
  import io.netty.handler.codec.dns.DnsQuestion;
  import io.netty.handler.codec.dns.DnsRecord;
  import io.netty.handler.codec.dns.DnsResponse;
  import io.netty.util.concurrent.Future;
  import io.netty.util.concurrent.Promise;
  
  import java.net.InetSocketAddress;
  
  final class TcpDnsQueryContext extends DnsQueryContext {
  
      TcpDnsQueryContext(Channel channel, Future<? extends Channel> channelReadyFuture,
                         InetSocketAddress nameServerAddr,
                         DnsQueryContextManager queryContextManager,
                         int maxPayLoadSize, boolean recursionDesired,
                         long queryTimeoutMillis,
                         DnsQuestion question, DnsRecord[] additionals,
                         Promise<AddressedEnvelope<DnsResponse, InetSocketAddress>> promise) {
          super(channel, channelReadyFuture, nameServerAddr, queryContextManager, maxPayLoadSize, recursionDesired,
                  // No retry via TCP.
                  queryTimeoutMillis, question, additionals, promise, null, false);
      }
  
      @Override
      protected DnsQuery newQuery(int id, InetSocketAddress nameServerAddr) {
          return new DefaultDnsQuery(id);
      }
  
      @Override
      protected String protocol() {
          return "TCP";
      }
  }