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.arrow.vector.ipc.message;
  
  /** Interface for Arrow IPC messages (https://arrow.apache.org/docs/format/IPC.html). */
  public interface ArrowMessage extends FBSerializable, AutoCloseable {
  
    long computeBodyLength();
  
    <T> T accepts(ArrowMessageVisitor<T> visitor);
  
    /** Returns the flatbuffer enum value indicating the type of the message. */
    byte getMessageType();
  
    /**
     * Visitor interface for implementations of {@link ArrowMessage}.
     *
     * @param <T> The type of value to return after visiting.
     */
    interface ArrowMessageVisitor<T> {
      T visit(ArrowDictionaryBatch message);
  
      T visit(ArrowRecordBatch message);
    }
  }
  