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   /*
    * Copyright 2017 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.handler.codec.dns.DnsQuestion;
  
  /**
   * Used to generate new instances of {@link DnsQueryLifecycleObserver}.
   */
  public interface DnsQueryLifecycleObserverFactory {
      /**
       * Create a new instance of a {@link DnsQueryLifecycleObserver}. This will be called at the start of a new query.
       * @param question The question being asked.
       * @return a new instance of a {@link DnsQueryLifecycleObserver}.
       */
      DnsQueryLifecycleObserver newDnsQueryLifecycleObserver(DnsQuestion question);
  }