/*
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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 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.jeb;
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import static org.opends.server.loggers.Debug.debugException;
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import static org.opends.server.messages.JebMessages.
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MSGID_JEB_DATABASE_EXCEPTION;
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import static org.opends.server.messages.MessageHandler.getMessage;
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import com.sleepycat.je.Cursor;
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import com.sleepycat.je.CursorConfig;
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import com.sleepycat.je.Database;
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import com.sleepycat.je.DatabaseConfig;
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import com.sleepycat.je.DatabaseEntry;
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import com.sleepycat.je.DatabaseException;
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import com.sleepycat.je.LockMode;
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import com.sleepycat.je.OperationStatus;
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import com.sleepycat.je.Transaction;
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import org.opends.server.protocols.asn1.ASN1OctetString;
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import org.opends.server.types.ConditionResult;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.Entry;
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import org.opends.server.types.Modification;
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import java.util.*;
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/**
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* Represents an index implemented by a JE database in which each key maps to
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* a set of entry IDs. The key is a byte array, and is constructed from some
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* normalized form of an attribute value (or fragment of a value) appearing
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* in the entry.
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*/
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public class Index
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{
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/**
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* The fully-qualified name of this class for debugging purposes.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.backends.jeb.Index";
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/**
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* The database container holding this index database.
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*/
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private Container container;
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/**
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* The JE database configuration.
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*/
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private DatabaseConfig dbConfig;
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/**
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* The name of the database within the container.
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*/
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private String name;
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/**
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* A cached per-thread JE database handle.
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*/
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private ThreadLocal<Database> threadLocalDatabase =
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new ThreadLocal<Database>();
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/**
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* The indexer object to construct index keys from LDAP attribute values.
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*/
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public Indexer indexer;
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/**
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* The comparator for index keys.
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*/
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private Comparator<byte[]> comparator;
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/**
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* The limit on the number of entry IDs that may be indexed by one key.
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*/
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private int indexEntryLimit;
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/**
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* Limit on the number of entry IDs that may be retrieved by cursoring
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* through an index.
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*/
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private int cursorEntryLimit;
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/**
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* Number of keys that have exceeded the entry limit since this
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* object was created.
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*/
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private int entryLimitExceededCount;
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/**
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* Create a new index object.
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* @param container The database container holding this index.
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* @param name The name of the index database within the container.
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* @param indexer The indexer object to construct index keys from LDAP
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* attribute values.
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* @param indexEntryLimit The configured limit on the number of entry IDs
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* that may be indexed by one key.
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* @param cursorEntryLimit The configured limit on the number of entry IDs
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* that may be retrieved by cursoring through an index.
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*/
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public Index(Container container, String name, Indexer indexer,
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int indexEntryLimit, int cursorEntryLimit)
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{
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this.container = container;
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this.name = name;
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this.indexer = indexer;
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this.comparator = indexer.getComparator();
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this.indexEntryLimit = indexEntryLimit;
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this.cursorEntryLimit = cursorEntryLimit;
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}
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/**
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* Open this index database.
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* @param dbConfig The requested JE database configuration.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public void open(DatabaseConfig dbConfig) throws DatabaseException
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{
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this.dbConfig = dbConfig;
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this.dbConfig.setBtreeComparator(comparator.getClass());
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getDatabase();
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}
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/**
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* Get a handle to the database. It returns a per-thread handle to avoid
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* any thread contention on the database handle. The container is
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* responsible for closing all handles.
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*
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* @return A database handle.
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*
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public Database getDatabase() throws DatabaseException
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{
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Database database = threadLocalDatabase.get();
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if (database == null)
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{
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database = container.openDatabase(dbConfig, name);
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threadLocalDatabase.set(database);
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}
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return database;
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}
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/**
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* Insert an entry ID into the set of IDs indexed by a given key.
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*
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* @param txn A database transaction, or null if none is required.
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* @param key The index key.
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* @param entryID The entry ID.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public void insertID(Transaction txn, DatabaseEntry key, EntryID entryID)
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throws DatabaseException
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{
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OperationStatus status;
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LockMode lockMode = LockMode.RMW;
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DatabaseEntry entryIDData = entryID.getDatabaseEntry();
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DatabaseEntry data = new DatabaseEntry();
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status = Container.read(getDatabase(), txn, key, data, lockMode);
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if (status == OperationStatus.SUCCESS)
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{
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EntryIDSet entryIDList =
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new EntryIDSet(key.getData(), data.getData());
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if (entryIDList.isDefined())
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{
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if (indexEntryLimit > 0 && entryIDList.size() >= indexEntryLimit)
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{
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entryIDList = new EntryIDSet();
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entryLimitExceededCount++;
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}
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else
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{
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entryIDList.add(entryID);
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}
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byte[] after = entryIDList.toDatabase();
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data.setData(after);
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Container.put(getDatabase(), txn, key, data);
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}
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}
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else
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{
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Container.put(getDatabase(), txn, key, entryIDData);
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}
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}
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/**
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* Remove an entry ID from the set of IDs indexed by a given key.
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*
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* @param txn A database transaction, or null if none is required.
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* @param key The index key.
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* @param entryID The entry ID.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public void removeID(Transaction txn, DatabaseEntry key, EntryID entryID)
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throws DatabaseException
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{
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OperationStatus status;
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LockMode lockMode = LockMode.RMW;
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DatabaseEntry data = new DatabaseEntry();
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status = Container.read(getDatabase(), txn, key, data, lockMode);
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if (status == OperationStatus.SUCCESS)
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{
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EntryIDSet entryIDList = new EntryIDSet(key.getData(), data.getData());
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if (entryIDList.isDefined())
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{
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if (!entryIDList.remove(entryID))
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{
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// This shouldn't happen!
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// TODO notify the database needs to be checked
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}
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else
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{
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byte[] after = entryIDList.toDatabase();
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if (after == null)
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{
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// No more IDs, so remove the key
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Container.delete(getDatabase(), txn, key);
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}
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else
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{
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data.setData(after);
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Container.put(getDatabase(), txn, key, data);
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}
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}
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}
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}
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else
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{
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// This shouldn't happen!
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// TODO notify the database needs to be checked
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}
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}
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/**
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* Check if an entry ID is in the set of IDs indexed by a given key.
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*
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* @param txn A database transaction, or null if none is required.
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* @param key The index key.
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* @param entryID The entry ID.
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* @return true if the entry ID is indexed by the given key,
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* false if it is not indexed by the given key,
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* undefined if the key has exceeded the entry limit.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public ConditionResult containsID(Transaction txn, DatabaseEntry key,
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EntryID entryID)
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throws DatabaseException
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{
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OperationStatus status;
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LockMode lockMode = LockMode.DEFAULT;
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DatabaseEntry data = new DatabaseEntry();
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status = Container.read(getDatabase(), txn, key, data, lockMode);
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if (status == OperationStatus.SUCCESS)
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{
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EntryIDSet entryIDList =
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new EntryIDSet(key.getData(), data.getData());
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if (!entryIDList.isDefined())
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{
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return ConditionResult.UNDEFINED;
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}
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else if (entryIDList.contains(entryID))
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{
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return ConditionResult.TRUE;
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}
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else
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{
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return ConditionResult.FALSE;
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}
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}
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else
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{
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return ConditionResult.FALSE;
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}
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}
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/**
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* Reads the set of entry IDs for a given key.
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*
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* @param key The database key.
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* @param txn A database transaction, or null if none is required.
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* @param lockMode The JE locking mode to be used for the database read.
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* @return The entry IDs indexed by this key.
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*/
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public EntryIDSet readKey(DatabaseEntry key, Transaction txn,
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LockMode lockMode)
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{
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try
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{
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OperationStatus status;
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DatabaseEntry data = new DatabaseEntry();
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status = Container.read(getDatabase(), txn, key, data, lockMode);
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if (status != OperationStatus.SUCCESS)
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{
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return new EntryIDSet(key.getData(), null);
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}
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return new EntryIDSet(key.getData(), data.getData());
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}
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catch (DatabaseException e)
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{
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assert debugException(CLASS_NAME, "readKey", e);
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return new EntryIDSet();
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}
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}
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/**
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* Writes the set of entry IDs for a given key.
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*
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* @param key The database key.
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* @param entryIDList The entry IDs indexed by this key.
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* @param txn A database transaction, or null if none is required.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public void writeKey(Transaction txn, DatabaseEntry key,
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EntryIDSet entryIDList)
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throws DatabaseException
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{
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DatabaseEntry data = new DatabaseEntry();
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byte[] after = entryIDList.toDatabase();
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if (after == null)
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{
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// No more IDs, so remove the key.
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Container.delete(getDatabase(), txn, key);
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}
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else
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{
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if (!entryIDList.isDefined())
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{
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entryLimitExceededCount++;
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}
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data.setData(after);
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Container.put(getDatabase(), txn, key, data);
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}
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}
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/**
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* Reads a range of keys and collects all their entry IDs into a
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* single set.
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*
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* @param lower The lower bound of the range. A 0 length byte array indicates
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* no lower bound and the range will start from the
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* smallest key.
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* @param upper The upper bound of the range. A 0 length byte array indicates
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* no upper bound and the range will end at the largest
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* key.
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* @param lowerIncluded true if a key exactly matching the lower bound
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* is included in the range, false if only keys
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* strictly greater than the lower bound are included.
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* This value is ignored if the lower bound is not
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* specified.
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* @param upperIncluded true if a key exactly matching the upper bound
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* is included in the range, false if only keys
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* strictly less than the upper bound are included.
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* This value is ignored if the upper bound is not
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* specified.
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* @return The set of entry IDs.
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*/
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public EntryIDSet readRange(byte[] lower, byte[] upper,
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boolean lowerIncluded, boolean upperIncluded)
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{
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LockMode lockMode = LockMode.DEFAULT;
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try
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{
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// Total number of IDs found so far.
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int totalIDCount = 0;
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DatabaseEntry data = new DatabaseEntry();
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DatabaseEntry key;
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ArrayList<EntryIDSet> lists = new ArrayList<EntryIDSet>();
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OperationStatus status;
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Cursor cursor;
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cursor = getDatabase().openCursor(null, CursorConfig.READ_COMMITTED);
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try
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{
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// Set the lower bound if necessary.
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if(lower.length > 0)
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{
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key = new DatabaseEntry(lower);
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// Initialize the cursor to the lower bound.
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status = cursor.getSearchKeyRange(key, data, lockMode);
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// Advance past the lower bound if necessary.
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if (status == OperationStatus.SUCCESS && !lowerIncluded &&
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comparator.compare(key.getData(), lower) == 0)
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{
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// Do not include the lower value.
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status = cursor.getNext(key, data, lockMode);
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}
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}
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else
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{
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key = new DatabaseEntry();
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status = cursor.getNext(key, data, lockMode);
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}
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if (status != OperationStatus.SUCCESS)
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{
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// There are no values.
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return new EntryIDSet(key.getData(), null);
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}
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// Step through the keys until we hit the upper bound or the last key.
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while (status == OperationStatus.SUCCESS)
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{
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// Check against the upper bound if necessary
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if(upper.length > 0)
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{
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int cmp = comparator.compare(key.getData(), upper);
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if ((cmp > 0) || (cmp == 0 && !upperIncluded))
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{
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break;
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}
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}
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EntryIDSet list = new EntryIDSet(key.getData(), data.getData());
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if (!list.isDefined())
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{
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// There is no point continuing.
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return list;
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}
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totalIDCount += list.size();
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if (cursorEntryLimit > 0 && totalIDCount > cursorEntryLimit)
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{
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// There are too many. Give up and return an undefined list.
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return new EntryIDSet();
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}
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lists.add(list);
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status = cursor.getNext(key, data, LockMode.DEFAULT);
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}
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return EntryIDSet.unionOfSets(lists, false);
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}
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finally
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{
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cursor.close();
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}
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}
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catch (DatabaseException e)
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{
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assert debugException(CLASS_NAME, "readRange", e);
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return new EntryIDSet();
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}
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}
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/**
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* Get the number of keys that have exceeded the entry limit since this
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* object was created.
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* @return The number of keys that have exceeded the entry limit since this
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* object was created.
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*/
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public int getEntryLimitExceededCount()
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{
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return entryLimitExceededCount;
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}
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/**
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* Get a string representation of this object.
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* @return return A string representation of this object.
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*/
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public String toString()
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{
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return name;
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}
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/**
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* Open a cursor to the JE database holding this index.
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* @param txn A JE database transaction to be associated with the cursor,
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* or null if none is required.
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* @param cursorConfig The requested JE cursor configuration.
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* @return A new JE cursor.
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* @throws JebException If an error occurs in the JE backend.
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*/
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public Cursor openCursor(Transaction txn, CursorConfig cursorConfig)
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throws JebException
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{
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try
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{
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return getDatabase().openCursor(txn, cursorConfig);
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}
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catch (DatabaseException e)
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{
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assert debugException(CLASS_NAME, "openCursor", e);
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int msgID = MSGID_JEB_DATABASE_EXCEPTION;
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String message = getMessage(msgID, e.getMessage());
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throw new JebException(msgID, message, e);
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}
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}
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/**
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* Update the index for a new entry.
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*
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* @param txn A database transaction, or null if none is required.
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* @param entryID The entry ID.
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* @param entry The entry to be indexed.
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* @throws DatabaseException If an error occurs in the JE database.
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* @throws DirectoryException If a Directory Server error occurs.
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*/
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public void addEntry(Transaction txn, EntryID entryID, Entry entry)
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throws DatabaseException, DirectoryException
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{
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HashSet<ASN1OctetString> addKeys = new HashSet<ASN1OctetString>();
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indexer.indexEntry(txn, entry, addKeys);
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DatabaseEntry key = new DatabaseEntry();
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for (ASN1OctetString keyBytes : addKeys)
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{
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key.setData(keyBytes.value());
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insertID(txn, key, entryID);
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}
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}
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/**
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* Update the index for a deleted entry.
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*
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* @param txn A database transaction, or null if none is required.
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* @param entryID The entry ID
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* @param entry The contents of the deleted entry.
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* @throws DatabaseException If an error occurs in the JE database.
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* @throws DirectoryException If a Directory Server error occurs.
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*/
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public void removeEntry(Transaction txn, EntryID entryID, Entry entry)
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throws DatabaseException, DirectoryException
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{
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HashSet<ASN1OctetString> delKeys = new HashSet<ASN1OctetString>();
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indexer.indexEntry(txn, entry, delKeys);
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DatabaseEntry key = new DatabaseEntry();
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for (ASN1OctetString keyBytes : delKeys)
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{
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key.setData(keyBytes.value());
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removeID(txn, key, entryID);
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}
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}
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/**
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* Update the index to reflect a sequence of modifications in a Modify
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* operation.
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*
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* @param txn A database transaction, or null if none is required.
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* @param entryID The ID of the entry that was modified.
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* @param oldEntry The entry before the modifications were applied.
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* @param newEntry The entry after the modifications were applied.
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* @param mods The sequence of modifications in the Modify operation.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public void modifyEntry(Transaction txn,
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EntryID entryID,
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Entry oldEntry,
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Entry newEntry,
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List<Modification> mods)
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throws DatabaseException
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{
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HashSet<ASN1OctetString> addKeys = new HashSet<ASN1OctetString>();
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HashSet<ASN1OctetString> delKeys = new HashSet<ASN1OctetString>();
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indexer.modifyEntry(txn, oldEntry, newEntry, mods, addKeys, delKeys);
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DatabaseEntry key = new DatabaseEntry();
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for (ASN1OctetString keyBytes : addKeys)
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{
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key.setData(keyBytes.value());
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insertID(txn, key, entryID);
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}
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for (ASN1OctetString keyBytes : delKeys)
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{
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key.setData(keyBytes.value());
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removeID(txn, key, entryID);
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}
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}
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}
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