1 /*
2 * Copyright The Apache Software Foundation
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21 package org.apache.hadoop.hbase.client;
22
23 import org.apache.hadoop.hbase.classification.InterfaceAudience;
24 import org.apache.hadoop.hbase.classification.InterfaceStability;
25
26 /**
27 * Specify Isolation levels in Scan operations.
28 * <p>
29 * There are two isolation levels. A READ_COMMITTED isolation level
30 * indicates that only data that is committed be returned in a scan.
31 * An isolation level of READ_UNCOMMITTED indicates that a scan
32 * should return data that is being modified by transactions that might
33 * not have been committed yet.
34 */
35 @InterfaceAudience.Public
36 @InterfaceStability.Stable
37 public enum IsolationLevel {
38
39 READ_COMMITTED(1),
40 READ_UNCOMMITTED(2);
41
42 IsolationLevel(int value) {}
43
44 public byte [] toBytes() {
45 return new byte [] { toByte() };
46 }
47
48 public byte toByte() {
49 return (byte)this.ordinal();
50 }
51
52 public static IsolationLevel fromBytes(byte [] bytes) {
53 return IsolationLevel.fromByte(bytes[0]);
54 }
55
56 public static IsolationLevel fromByte(byte vbyte) {
57 return IsolationLevel.values()[vbyte];
58 }
59 }