001/*
002 * Copyright The Apache Software Foundation
003 *
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package org.apache.hadoop.hbase.client;
022
023import org.apache.yetus.audience.InterfaceAudience;
024
025/**
026 * Specify Isolation levels in Scan operations.
027 * <p>
028 * There are two isolation levels. A READ_COMMITTED isolation level
029 * indicates that only data that is committed be returned in a scan.
030 * An isolation level of READ_UNCOMMITTED indicates that a scan
031 * should return data that is being modified by transactions that might
032 * not have been committed yet.
033 */
034@InterfaceAudience.Public
035public enum IsolationLevel {
036
037  READ_COMMITTED(1),
038  READ_UNCOMMITTED(2);
039
040  IsolationLevel(int value) {}
041
042  public byte [] toBytes() {
043    return new byte [] { toByte() };
044  }
045
046  public byte toByte() {
047    return (byte)this.ordinal();
048  }
049
050  public static IsolationLevel fromBytes(byte [] bytes) {
051    return IsolationLevel.fromByte(bytes[0]);
052  }
053
054  public static IsolationLevel fromByte(byte vbyte) {
055    return IsolationLevel.values()[vbyte];
056  }
057}