/*
|
* CDDL HEADER START
|
*
|
* The contents of this file are subject to the terms of the
|
* Common Development and Distribution License, Version 1.0 only
|
* (the "License"). You may not use this file except in compliance
|
* with the License.
|
*
|
* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
|
* or http://forgerock.org/license/CDDLv1.0.html.
|
* See the License for the specific language governing permissions
|
* and limitations under the License.
|
*
|
* When distributing Covered Code, include this CDDL HEADER in each
|
* file and include the License file at legal-notices/CDDLv1_0.txt.
|
* If applicable, add the following below this CDDL HEADER, with the
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
* information:
|
* Portions Copyright [yyyy] [name of copyright owner]
|
*
|
* CDDL HEADER END
|
*
|
* Copyright 2014 ForgeRock AS
|
*/
|
package org.opends.server.replication.server.changelog.je;
|
|
import java.util.Collections;
|
import java.util.Iterator;
|
import java.util.Map.Entry;
|
import java.util.concurrent.ConcurrentSkipListMap;
|
|
import org.opends.server.replication.common.CSN;
|
import org.opends.server.replication.protocol.UpdateMsg;
|
import org.opends.server.replication.server.changelog.api.ChangelogException;
|
import org.opends.server.replication.server.changelog.api.DBCursor;
|
import org.opends.server.replication.server.changelog.api.ReplicationDomainDB;
|
import org.opends.server.types.DN;
|
|
/**
|
* Cursor iterating over a replication domain's replica DBs.
|
*
|
* \@NotThreadSafe
|
*/
|
public class DomainDBCursor extends CompositeDBCursor<Void>
|
{
|
|
private final DN baseDN;
|
private final ReplicationDomainDB domainDB;
|
|
private final ConcurrentSkipListMap<Integer, CSN> newReplicas =
|
new ConcurrentSkipListMap<Integer, CSN>();
|
/**
|
* Replaces null CSNs in ConcurrentSkipListMap that does not support null values.
|
*/
|
private static final CSN NULL_CSN = new CSN(0, 0, 0);
|
|
/**
|
* Builds a DomainDBCursor instance.
|
*
|
* @param baseDN
|
* the replication domain baseDN of this cursor
|
* @param domainDB
|
* the DB for the provided replication domain
|
*/
|
public DomainDBCursor(DN baseDN, ReplicationDomainDB domainDB)
|
{
|
this.baseDN = baseDN;
|
this.domainDB = domainDB;
|
}
|
|
/**
|
* Returns the replication domain baseDN of this cursor.
|
*
|
* @return the replication domain baseDN of this cursor.
|
*/
|
public DN getBaseDN()
|
{
|
return baseDN;
|
}
|
|
/**
|
* Adds a replicaDB for this cursor to iterate over. Added cursors will be
|
* created and iterated over on the next call to {@link #next()}.
|
*
|
* @param serverId
|
* the serverId of the replica
|
* @param startAfterCSN
|
* the CSN after which to start iterating
|
*/
|
public void addReplicaDB(int serverId, CSN startAfterCSN)
|
{
|
// only keep the oldest CSN that will be the new cursor's starting point
|
newReplicas.putIfAbsent(serverId, startAfterCSN != null ? startAfterCSN : NULL_CSN);
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
protected void incorporateNewCursors() throws ChangelogException
|
{
|
for (Iterator<Entry<Integer, CSN>> iter = newReplicas.entrySet().iterator(); iter.hasNext();)
|
{
|
final Entry<Integer, CSN> pair = iter.next();
|
final int serverId = pair.getKey();
|
final CSN csn = pair.getValue();
|
final CSN startAfterCSN = !NULL_CSN.equals(csn) ? csn : null;
|
final DBCursor<UpdateMsg> cursor = domainDB.getCursorFrom(baseDN, serverId, startAfterCSN);
|
addCursor(cursor, null);
|
iter.remove();
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
@SuppressWarnings("unchecked")
|
protected Iterator<Void> removedCursorsIterator()
|
{
|
return Collections.EMPTY_LIST.iterator(); // nothing to remove
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void close()
|
{
|
super.close();
|
domainDB.unregisterCursor(this);
|
newReplicas.clear();
|
}
|
|
}
|
