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 /** 24 * Specify Isolation levels in Scan operations. 25 * <p> 26 * There are two isolation levels. A READ_COMMITTED isolation level 27 * indicates that only data that is committed be returned in a scan. 28 * An isolation level of READ_UNCOMMITTED indicates that a scan 29 * should return data that is being modified by transactions that might 30 * not have been committed yet. 31 */ 32 public enum IsolationLevel { 33 34 READ_COMMITTED(1), 35 READ_UNCOMMITTED(2); 36 37 IsolationLevel(int value) {} 38 39 public byte [] toBytes() { 40 return new byte [] { toByte() }; 41 } 42 43 public byte toByte() { 44 return (byte)this.ordinal(); 45 } 46 47 public static IsolationLevel fromBytes(byte [] bytes) { 48 return IsolationLevel.fromByte(bytes[0]); 49 } 50 51 public static IsolationLevel fromByte(byte vbyte) { 52 return IsolationLevel.values()[vbyte]; 53 } 54 }