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, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.mavibot.btree; 021 022 023/** 024 * An enum to describe the B-tree type. We have three possible type : 025 * <ul> 026 * <li>IN_MEMORY : the B-tree will remain in memory, and won't be persisted on disk</li> 027 * <li>BACKED_ON_DISK : the B-tree is in memory, but will be persisted on disk</li> 028 * <li>PERSISTED : the B-tree is managed by a RecordManager, and some pages may 029 * be swapped out from memory on demand</li> 030 * <li>PERSISTED_SUB : The B-tree is a Persisted B-tree, but a Sub B-tree one</li> 031 * <li>PERSISTED_MANAGEMENT : This is a Persisted B-tree used to manage the other B-trees</li> 032 * </ul> 033 * 034 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 035 */ 036public enum BTreeTypeEnum 037{ 038 /** Pure in-memory B-tree, not persisted on disk */ 039 IN_MEMORY, 040 041 /** Persisted B-tree */ 042 PERSISTED, 043 044 /** Persisted sub B-tree */ 045 PERSISTED_SUB, 046 047 /** Persisted Management B-tree */ 048 BTREE_OF_BTREES, 049 050 /** Persisted Management B-tree */ 051 COPIED_PAGES_BTREE, 052 053 /** In-memory B-tree but saved on disk */ 054 BACKED_ON_DISK 055}