ceph/src/rocksdb/java/src/main/java/org/rocksdb/CompactionStyle.java

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 // This source code is licensed under the BSD-style license found in the
   3 // LICENSE file in the root directory of this source tree. An additional grant
   4 // of patent rights can be found in the PATENTS file in the same directory.
   5
   6 package org.rocksdb;
   7
   8 /**
   9  * Enum CompactionStyle
  10  *
  11  * RocksDB supports different styles of compaction. Available
  12  * compaction styles can be chosen using this enumeration.
  13  *
  14  * <ol>
  15  *   <li><strong>LEVEL</strong> - Level based Compaction style</li>
  16  *   <li><strong>UNIVERSAL</strong> - Universal Compaction Style is a
  17  *   compaction style, targeting the use cases requiring lower write
  18  *   amplification, trading off read amplification and space
  19  *   amplification.</li>
  20  *   <li><strong>FIFO</strong> - FIFO compaction style is the simplest
  21  *   compaction strategy. It is suited for keeping event log data with
  22  *   very low overhead (query log for example). It periodically deletes
  23  *   the old data, so it's basically a TTL compaction style.</li>
  24  * </ol>
  25  *
  26  * @see <a
  27  * href="https://github.com/facebook/rocksdb/wiki/Universal-Compaction">
  28  * Universal Compaction</a>
  29  * @see <a
  30  * href="https://github.com/facebook/rocksdb/wiki/FIFO-compaction-style">
  31  * FIFO Compaction</a>
  32  */
  33 public enum CompactionStyle {
  34   LEVEL((byte) 0),
  35   UNIVERSAL((byte) 1),
  36   FIFO((byte) 2);
  37
  38   private final byte value_;
  39
  40   private CompactionStyle(byte value) {
  41     value_ = value;
  42   }
  43
  44   /**
  45    * Returns the byte value of the enumerations value
  46    *
  47    * @return byte representation
  48    */
  49   public byte getValue() {
  50     return value_;
  51   }
  52 }