/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.jeb;
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import com.sleepycat.je.Database;
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import com.sleepycat.je.DatabaseException;
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import static org.opends.server.loggers.debug.DebugLogger.debugCaught;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import org.opends.server.types.DebugLogLevel;
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import java.util.Comparator;
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/**
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* This comparator is used to sort databases in order of priority
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* for preloading into the cache.
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*/
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public class DbPreloadComparator implements Comparator<Database>
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{
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/**
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* Calculate the relative priority of a database for preloading.
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*
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* @param database A handle to the database.
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* @return 1 for id2entry database, 2 for dn2id database, 3 for all others.
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*/
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static private int priority(Database database)
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{
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try
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{
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String name = database.getDatabaseName();
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if (name.endsWith(EntryContainer.ID2ENTRY_DATABASE_NAME))
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{
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return 1;
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}
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else if (name.endsWith(EntryContainer.DN2ID_DATABASE_NAME))
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{
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return 2;
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}
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else
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{
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return 3;
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}
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}
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catch (DatabaseException e)
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{
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if (debugEnabled())
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{
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debugCaught(DebugLogLevel.ERROR, e);
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}
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return 3;
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}
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}
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/**
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* Compares its two arguments for order. Returns a negative integer,
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* zero, or a positive integer as the first argument is less than, equal
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* to, or greater than the second.
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*
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* @param database1 the first object to be compared.
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* @param database2 the second object to be compared.
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* @return a negative integer, zero, or a positive integer as the
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* first argument is less than, equal to, or greater than the
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* second.
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**/
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public int compare(Database database1, Database database2)
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{
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return priority(database1) - priority(database2);
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}
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}
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