001 /* 002 * CDDL HEADER START 003 * 004 * The contents of this file are subject to the terms of the 005 * Common Development and Distribution License, Version 1.0 only 006 * (the "License"). You may not use this file except in compliance 007 * with the License. 008 * 009 * You can obtain a copy of the license at 010 * trunk/opends/resource/legal-notices/OpenDS.LICENSE 011 * or https://OpenDS.dev.java.net/OpenDS.LICENSE. 012 * See the License for the specific language governing permissions 013 * and limitations under the License. 014 * 015 * When distributing Covered Code, include this CDDL HEADER in each 016 * file and include the License file at 017 * trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable, 018 * add the following below this CDDL HEADER, with the fields enclosed 019 * by brackets "[]" replaced with your own identifying information: 020 * Portions Copyright [yyyy] [name of copyright owner] 021 * 022 * CDDL HEADER END 023 * 024 * 025 * Copyright 2006-2008 Sun Microsystems, Inc. 026 */ 027 package org.opends.server.backends.jeb; 028 029 import static org.opends.server.loggers.debug.DebugLogger.*; 030 import org.opends.server.loggers.debug.DebugTracer; 031 032 import java.util.Comparator; 033 034 /** 035 * This comparator is used to sort databases in order of priority 036 * for preloading into the cache. 037 */ 038 public class DbPreloadComparator 039 implements Comparator<DatabaseContainer> 040 { 041 /** 042 * The tracer object for the debug logger. 043 */ 044 private static final DebugTracer TRACER = getTracer(); 045 046 047 /** 048 * Calculate the relative priority of a database for preloading. 049 * 050 * @param database A handle to the database. 051 * @return 1 for id2entry database, 2 for dn2id database, 3 for all others. 052 */ 053 static private int priority(DatabaseContainer database) 054 { 055 String name = database.getName(); 056 if (name.endsWith(EntryContainer.ID2ENTRY_DATABASE_NAME)) 057 { 058 return 1; 059 } 060 else if (name.endsWith(EntryContainer.DN2ID_DATABASE_NAME)) 061 { 062 return 2; 063 } 064 else 065 { 066 return 3; 067 } 068 } 069 070 /** 071 * Compares its two arguments for order. Returns a negative integer, 072 * zero, or a positive integer as the first argument is less than, equal 073 * to, or greater than the second. 074 * 075 * @param database1 the first object to be compared. 076 * @param database2 the second object to be compared. 077 * @return a negative integer, zero, or a positive integer as the 078 * first argument is less than, equal to, or greater than the 079 * second. 080 **/ 081 public int compare(DatabaseContainer database1, DatabaseContainer database2) 082 { 083 return priority(database1) - priority(database2); 084 } 085 }