/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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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* Copyright 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2012-2015 ForgeRock AS
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*/
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package org.opends.server.backends.pluggable;
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import static org.forgerock.util.Reject.*;
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import static org.opends.messages.BackendMessages.*;
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import static org.opends.server.backends.pluggable.EntryIDSet.*;
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import static org.opends.server.backends.pluggable.State.IndexFlag.*;
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import java.util.EnumSet;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.ldap.ByteString;
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import org.forgerock.util.promise.NeverThrowsException;
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import org.opends.server.backends.pluggable.CursorTransformer.ValueTransformer;
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import org.opends.server.backends.pluggable.EntryIDSet.EntryIDSetCodec;
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import org.opends.server.backends.pluggable.State.IndexFlag;
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import org.opends.server.backends.pluggable.spi.Cursor;
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import org.opends.server.backends.pluggable.spi.ReadableTransaction;
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import org.opends.server.backends.pluggable.spi.StorageRuntimeException;
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import org.opends.server.backends.pluggable.spi.TreeName;
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import org.opends.server.backends.pluggable.spi.UpdateFunction;
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import org.opends.server.backends.pluggable.spi.WriteableTransaction;
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/**
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* Represents an index implemented by a tree in which each key maps to a set of entry IDs. The key
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* is a byte array, and is constructed from some normalized form of an attribute value (or fragment
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* of a value) appearing in the entry.
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*/
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class DefaultIndex extends AbstractTree implements Index
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{
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private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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/** The limit on the number of entry IDs that may be indexed by one key. */
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private final State state;
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private final EntryContainer entryContainer;
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private int indexEntryLimit;
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private EntryIDSetCodec codec;
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/**
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* A flag to indicate if this index should be trusted to be consistent with the entries tree.
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* If not trusted, we assume that existing entryIDSets for a key is still accurate. However, keys
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* that do not exist are undefined instead of an empty entryIDSet. The following rules will be
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* observed when the index is not trusted:
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* <ul>
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* <li>no entryIDs will be added to a non-existing key.</li>
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* <li>undefined entryIdSet will be returned whenever a key is not found.</li>
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* </ul>
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*/
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private volatile boolean trusted;
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/**
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* Create a new index object.
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*
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* @param name
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* The name of the index tree within the entryContainer.
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* @param state
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* The state tree to persist index state info.
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* @param indexEntryLimit
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* The configured limit on the number of entry IDs that may be indexed by one key.
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* @param entryContainer
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* The entryContainer holding this index.
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* @throws StorageRuntimeException
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* If an error occurs in the storage.
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*/
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DefaultIndex(TreeName name, State state, int indexEntryLimit, EntryContainer entryContainer)
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throws StorageRuntimeException
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{
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super(name);
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this.indexEntryLimit = indexEntryLimit;
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this.state = state;
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this.entryContainer = entryContainer;
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}
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@Override
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final void afterOpen(WriteableTransaction txn)
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{
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final EnumSet<IndexFlag> flags = state.getIndexFlags(txn, getName());
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codec = flags.contains(COMPACTED) ? CODEC_V2 : CODEC_V1;
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trusted = flags.contains(TRUSTED);
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if (!trusted && entryContainer.getHighestEntryID(txn).longValue() == 0)
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{
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// If there are no entries in the entry container then there
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// is no reason why this index can't be upgraded to trusted.
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setTrusted(txn, true);
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}
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}
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@Override
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public String valueToString(ByteString value)
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{
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StringBuilder sb = new StringBuilder();
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final EntryIDSet eIDSet = decodeValue(ByteString.empty(), value);
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eIDSet.toString(sb);
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if (eIDSet.isDefined())
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{
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for(EntryID entryID : eIDSet)
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{
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sb.append(" ");
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sb.append(entryID);
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}
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}
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return sb.toString();
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}
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@Override
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public final Cursor<ByteString, EntryIDSet> openCursor(ReadableTransaction txn)
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{
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checkNotNull(txn, "txn must not be null");
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return CursorTransformer.transformValues(txn.openCursor(getName()),
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new ValueTransformer<ByteString, ByteString, EntryIDSet, NeverThrowsException>()
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{
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@Override
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public EntryIDSet transform(ByteString key, ByteString value) throws NeverThrowsException
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{
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return decodeValue(key, value);
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}
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});
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}
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EntryIDSet decodeValue(ByteSequence key, ByteString value)
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{
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return codec.decode(key, value);
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}
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ByteString toValue(EntryIDSet entryIDSet)
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{
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return codec.encode(entryIDSet);
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}
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@Override
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public final void update(final WriteableTransaction txn, final ByteString key, final EntryIDSet deletedIDs,
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final EntryIDSet addedIDs) throws StorageRuntimeException
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{
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// Handle cases where nothing is changed early to avoid DB access.
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if (isNullOrEmpty(deletedIDs) && isNullOrEmpty(addedIDs))
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{
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return;
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}
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/*
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* Avoid taking a write lock on a record which has hit all IDs because it is likely to be a
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* point of contention.
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*/
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if (!get(txn, key).isDefined())
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{
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return;
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}
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// The record is going to be changed in some way.
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txn.update(getName(), key, new UpdateFunction()
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{
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@Override
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public ByteSequence computeNewValue(final ByteSequence oldValue)
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{
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if (oldValue != null)
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{
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EntryIDSet entryIDSet = computeEntryIDSet(key, oldValue.toByteString(), deletedIDs, addedIDs);
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/*
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* If there are no more IDs then return null indicating that the record should be removed.
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* If index is not trusted then this will cause all subsequent reads for this key to
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* return undefined set.
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*/
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return entryIDSet.size() == 0 ? null : toValue(entryIDSet);
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}
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else if (trusted)
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{
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if (deletedIDs != null)
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{
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logIndexCorruptError(txn, key);
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}
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if (isNotEmpty(addedIDs))
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{
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return toValue(addedIDs);
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}
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}
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return null; // no change.
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}
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});
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}
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private static boolean isNullOrEmpty(EntryIDSet entryIDSet)
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{
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return entryIDSet == null || entryIDSet.size() == 0;
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}
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private static boolean isNotEmpty(EntryIDSet entryIDSet)
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{
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return entryIDSet != null && entryIDSet.size() > 0;
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}
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private EntryIDSet computeEntryIDSet(ByteString key, ByteString value, EntryIDSet deletedIDs, EntryIDSet addedIDs)
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{
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EntryIDSet entryIDSet = decodeValue(key, value);
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if (addedIDs != null)
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{
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if (entryIDSet.isDefined() && indexEntryLimit > 0)
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{
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final long nbDeleted = deletedIDs != null ? deletedIDs.size() : 0;
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final long idCountDelta = addedIDs.size() - nbDeleted;
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if (idCountDelta + entryIDSet.size() >= indexEntryLimit)
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{
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entryIDSet = newUndefinedSetWithKey(key);
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if (logger.isTraceEnabled())
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{
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logger.trace("Index entry exceeded in index %s. " + "Limit: %d. ID list size: %d.\nKey:%s", getName(),
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indexEntryLimit, idCountDelta + addedIDs.size(), key.toHexPlusAsciiString(4));
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}
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return entryIDSet;
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}
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}
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entryIDSet.addAll(addedIDs);
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}
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if (deletedIDs != null)
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{
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entryIDSet.removeAll(deletedIDs);
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}
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return entryIDSet;
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}
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private void logIndexCorruptError(WriteableTransaction txn, ByteString key)
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{
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if (logger.isTraceEnabled())
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{
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logger.trace("The expected key does not exist in the index %s.\nKey:%s", getName(), key.toHexPlusAsciiString(4));
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}
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setTrusted(txn, false);
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logger.error(ERR_INDEX_CORRUPT_REQUIRES_REBUILD, getName());
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}
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@Override
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public final EntryIDSet get(ReadableTransaction txn, ByteSequence key)
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{
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try
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{
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ByteString value = txn.read(getName(), key);
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if (value != null)
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{
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return decodeValue(key, value);
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}
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return trusted ? newDefinedSet() : newUndefinedSet();
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}
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catch (StorageRuntimeException e)
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{
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logger.traceException(e);
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return newUndefinedSet();
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}
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}
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@Override
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public final boolean setIndexEntryLimit(int indexEntryLimit)
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{
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final boolean rebuildRequired = this.indexEntryLimit < indexEntryLimit;
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this.indexEntryLimit = indexEntryLimit;
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return rebuildRequired;
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}
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@Override
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public final int getIndexEntryLimit()
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{
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return indexEntryLimit;
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}
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@Override
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public final synchronized void setTrusted(WriteableTransaction txn, boolean trusted) throws StorageRuntimeException
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{
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this.trusted = trusted;
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if (trusted)
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{
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state.addFlagsToIndex(txn, getName(), TRUSTED);
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}
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else
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{
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state.removeFlagsFromIndex(txn, getName(), TRUSTED);
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}
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}
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@Override
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public final boolean isTrusted()
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{
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return trusted;
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}
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}
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