1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.directory.mavibot.btree; 21 22 23 /** 24 * An enum to describe the B-tree type. We have three possible type : 25 * <ul> 26 * <li>IN_MEMORY : the B-tree will remain in memory, and won't be persisted on disk</li> 27 * <li>BACKED_ON_DISK : the B-tree is in memory, but will be persisted on disk</li> 28 * <li>PERSISTED : the B-tree is managed by a RecordManager, and some pages may 29 * be swapped out from memory on demand</li> 30 * <li>PERSISTED_SUB : The B-tree is a Persisted B-tree, but a Sub B-tree one</li> 31 * <li>PERSISTED_MANAGEMENT : This is a Persisted B-tree used to manage the other B-trees</li> 32 * </ul> 33 * 34 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 35 */ 36 public enum BTreeTypeEnum 37 { 38 /** Pure in-memory B-tree, not persisted on disk */ 39 IN_MEMORY, 40 41 /** Persisted B-tree */ 42 PERSISTED, 43 44 /** Persisted sub B-tree */ 45 PERSISTED_SUB, 46 47 /** Persisted Management B-tree */ 48 BTREE_OF_BTREES, 49 50 /** Persisted Management B-tree */ 51 COPIED_PAGES_BTREE, 52 53 /** In-memory B-tree but saved on disk */ 54 BACKED_ON_DISK 55 }