content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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
   *
   *    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 org.apache.kafka.raft.internals;
  
  import org.apache.kafka.common.Node;
  import org.apache.kafka.common.network.ListenerName;
  import org.apache.kafka.common.protocol.ApiMessage;
  
  import java.util.OptionalLong;
  import java.util.function.Supplier;
  
  /**
   * Interface for sending KRaft requests.
   *
   * Responsible for managing the connection state and sending request when the connection is
   * available.
   */
  public interface RequestSender {
      /**
       * The name of the listener used for sending request.
       *
       * This is generally the default (first) listener.
       */
      ListenerName listenerName();
  
      /**
       * Send a KRaft request to the destination.
       *
       * @param destination the destination for the request
       * @param requestSupplier the default constructor for the request
       * @param currentTimeMs the current time
       * @return the request timeout if the request was sent; otherwise {@code Optional.empty()}
       */
      OptionalLong send(
          Node destination,
          Supplier<ApiMessage> requestSupplier,
          long currentTimeMs
      );
  }
  