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.asterix.common.transactions;
  
  import java.nio.ByteBuffer;
  
  /**
   * This interface provide callback mechanism for adding marker logs to the transaction log file
   */
  public interface ILogMarkerCallback {
  
      String KEY_MARKER_CALLBACK = "MARKER_CALLBACK";
  
      /**
       * Called before writing the marker log allowing addition of specific information to the log record
       *
       * @param buffer:
       *            the log buffer to write to
       */
      void before(ByteBuffer buffer);
  
      /**
       * Called after the log's been appended to the log tail passing the position of the log used for random access
       *
       * @param lsn
       */
      void after(long lsn);
  
  }
  