/*
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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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* Copyright 2014 ForgeRock AS
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*/
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package org.opends.server.replication.server.changelog.je;
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import java.util.Iterator;
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import java.util.Map.Entry;
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import java.util.concurrent.ConcurrentSkipListMap;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.protocol.UpdateMsg;
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import org.opends.server.replication.server.changelog.api.ChangelogException;
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import org.opends.server.replication.server.changelog.api.DBCursor;
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import org.opends.server.replication.server.changelog.api.ReplicationDomainDB;
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import org.opends.server.types.DN;
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/**
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* Cursor iterating over a replication domain's replica DBs.
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*
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* \@NotThreadSafe
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*/
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public class DomainDBCursor extends CompositeDBCursor<Void>
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{
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private final DN baseDN;
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private final ReplicationDomainDB domainDB;
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private final ConcurrentSkipListMap<Integer, CSN> newReplicas =
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new ConcurrentSkipListMap<Integer, CSN>();
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/**
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* Replaces null CSNs in ConcurrentSkipListMap that does not support null values.
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*/
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private static final CSN NULL_CSN = new CSN(0, 0, 0);
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private final PositionStrategy positionStrategy;
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/**
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* Builds a DomainDBCursor instance.
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*
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* @param baseDN
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* the replication domain baseDN of this cursor
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* @param domainDB
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* the DB for the provided replication domain
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* @param positionStrategy
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* Cursor position strategy, which allow to indicates at which
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* exact position the cursor must start
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*/
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public DomainDBCursor(DN baseDN, ReplicationDomainDB domainDB, PositionStrategy positionStrategy)
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{
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this.baseDN = baseDN;
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this.domainDB = domainDB;
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this.positionStrategy = positionStrategy;
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}
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/**
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* Returns the replication domain baseDN of this cursor.
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*
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* @return the replication domain baseDN of this cursor.
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*/
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public DN getBaseDN()
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{
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return baseDN;
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}
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/**
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* Adds a replicaDB for this cursor to iterate over. Added cursors will be
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* created and iterated over on the next call to {@link #next()}.
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*
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* @param serverId
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* the serverId of the replica
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* @param startAfterCSN
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* the CSN after which to start iterating
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*/
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public void addReplicaDB(int serverId, CSN startAfterCSN)
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{
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// only keep the oldest CSN that will be the new cursor's starting point
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newReplicas.putIfAbsent(serverId, startAfterCSN != null ? startAfterCSN : NULL_CSN);
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}
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/** {@inheritDoc} */
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@Override
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protected void incorporateNewCursors() throws ChangelogException
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{
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for (Iterator<Entry<Integer, CSN>> iter = newReplicas.entrySet().iterator(); iter.hasNext();)
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{
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final Entry<Integer, CSN> pair = iter.next();
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final int serverId = pair.getKey();
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final CSN csn = pair.getValue();
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final CSN startCSN = !NULL_CSN.equals(csn) ? csn : null;
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final DBCursor<UpdateMsg> cursor =
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domainDB.getCursorFrom(baseDN, serverId, startCSN, positionStrategy);
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addCursor(cursor, null);
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iter.remove();
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}
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}
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/** {@inheritDoc} */
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@Override
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public void close()
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{
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super.close();
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domainDB.unregisterCursor(this);
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newReplicas.clear();
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}
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}
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