001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.client;
019
020import org.apache.yetus.audience.InterfaceAudience;
021
022/**
023 * Specify Isolation levels in Scan operations.
024 * <p>
025 * There are two isolation levels. A READ_COMMITTED isolation level indicates that only data that is
026 * committed be returned in a scan. An isolation level of READ_UNCOMMITTED indicates that a scan
027 * should return data that is being modified by transactions that might not have been committed yet.
028 */
029@InterfaceAudience.Public
030public enum IsolationLevel {
031
032  READ_COMMITTED,
033  READ_UNCOMMITTED;
034
035  public byte[] toBytes() {
036    return new byte[] { toByte() };
037  }
038
039  public byte toByte() {
040    return (byte) this.ordinal();
041  }
042
043  public static IsolationLevel fromBytes(byte[] bytes) {
044    return IsolationLevel.fromByte(bytes[0]);
045  }
046
047  public static IsolationLevel fromByte(byte vbyte) {
048    return IsolationLevel.values()[vbyte];
049  }
050}