content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * Licensed 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.aeron.logbuffer;
  
  import org.agrona.DirectBuffer;
  
  /**
   * Handler for reading data that is coming from a log buffer. The frame will either contain a whole message
   * or a fragment of a message to be reassembled. Messages are fragmented if greater than the frame for MTU in length.
   */
  @FunctionalInterface
  public interface FragmentHandler
  {
      /**
       * Callback for handling fragments of data being read from a log.
       * <p>
       * Within this callback reentrant calls to the {@link io.aeron.Aeron} client are not permitted and
       * will result in undefined behaviour.
       *
       * @param buffer containing the data.
       * @param offset at which the data begins.
       * @param length of the data in bytes.
       * @param header representing the metadata for the data.
       */
      void onFragment(DirectBuffer buffer, int offset, int length, Header header);
  }
  