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.bookkeeper.bookie;
  
  import java.io.IOException;
  /**
   * Interface that identifies LedgerStorage implementations using EntryLogger and running periodic entries compaction.
   */
  public interface CompactableLedgerStorage extends LedgerStorage {
  
      /**
       * Get an iterator over a range of ledger ids stored in the bookie.
       *
       * @param firstLedgerId first ledger id in the sequence (included)
       * @param lastLedgerId last ledger id in the sequence (not included)
       * @return
       */
      Iterable<Long> getActiveLedgersInRange(long firstLedgerId, long lastLedgerId)
              throws IOException;
  
      /**
       * Update the location of several entries.
       *
       * @param locations the list of locations to update
       * @throws IOException
       */
      void updateEntriesLocations(Iterable<EntryLocation> locations) throws IOException;
  
      /**
       * Flush the entries locations index for the compacted entries.
       *
       * @throws IOException
       */
      void flushEntriesLocationsIndex() throws IOException;
  }
  