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.distributedlog.logsegment;
  
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import org.apache.distributedlog.Entry;
  import org.apache.distributedlog.io.AsyncCloseable;
  
  /**
   * An interface class to read entries {@link org.apache.distributedlog.Entry}
   * from a random access log segment.
   */
  public interface LogSegmentRandomAccessEntryReader extends AsyncCloseable {
  
      /**
       * Read entries [startEntryId, endEntryId] from a random access log segment.
       *
       * @param startEntryId start entry id
       * @param endEntryId end entry id
       * @return A promise that when satisfied will contain a list of entries of [startEntryId, endEntryId].
       */
      CompletableFuture<List<Entry.Reader>> readEntries(long startEntryId, long endEntryId);
  
      /**
       * Return the last add confirmed entry id (LAC).
       *
       * @return the last add confirmed entry id.
       */
      long getLastAddConfirmed();
  }
  