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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 | } |