/*
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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 2011-2014 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.ArrayList;
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import java.util.Date;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.opends.server.admin.std.server.MonitorProviderCfg;
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import org.opends.server.api.MonitorProvider;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.DirectoryServer;
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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.ReplicationServer;
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import org.opends.server.replication.server.ReplicationServerDomain;
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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.DBCursor.PositionStrategy;
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import org.opends.server.replication.server.changelog.je.ReplicationDB.ReplServerDBCursor;
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import org.opends.server.types.Attribute;
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import org.opends.server.types.Attributes;
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import org.opends.server.types.DN;
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import org.opends.server.types.InitializationException;
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import static org.opends.messages.ReplicationMessages.*;
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/**
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* Represents a replication server database for one server in the topology.
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* <p>
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* It is responsible for efficiently saving the updates that is received from
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* each master server into stable storage.
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* <p>
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* It is also able to generate a {@link DBCursor} that can be used to
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* read all changes from a given {@link CSN}.
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* <p>
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* It publishes some monitoring information below cn=monitor.
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*/
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class JEReplicaDB
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{
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/**
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* Class that allows atomically setting oldest and newest CSNs without
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* synchronization.
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*
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* @Immutable
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*/
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private static final class CSNLimits
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{
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private final CSN oldestCSN;
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private final CSN newestCSN;
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public CSNLimits(CSN oldestCSN, CSN newestCSN)
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{
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this.oldestCSN = oldestCSN;
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this.newestCSN = newestCSN;
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}
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}
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private final AtomicBoolean shutdown = new AtomicBoolean(false);
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/**
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* Holds the oldest and newest CSNs for this replicaDB for fast retrieval.
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*
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* @NonNull
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*/
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private volatile CSNLimits csnLimits;
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private final int serverId;
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private final DN baseDN;
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private final DbMonitorProvider dbMonitor = new DbMonitorProvider();
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private final ReplicationServer replicationServer;
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private final ReplicationDB db;
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/**
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* Creates a new ReplicaDB associated to a given LDAP server.
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*
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* @param serverId
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* Id of this server.
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* @param baseDN
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* the replication domain baseDN.
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* @param replicationServer
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* The ReplicationServer that creates this ReplicaDB.
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* @param replicationEnv
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* the Database Env to use to create the ReplicationServer DB. server
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* for this domain.
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* @throws ChangelogException
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* If a database problem happened
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*/
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JEReplicaDB(final int serverId, final DN baseDN, final ReplicationServer replicationServer,
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final ReplicationDbEnv replicationEnv) throws ChangelogException
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{
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this.serverId = serverId;
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this.baseDN = baseDN;
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this.replicationServer = replicationServer;
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this.db = new ReplicationDB(serverId, baseDN, replicationServer, replicationEnv);
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this.csnLimits = new CSNLimits(db.readOldestCSN(), db.readNewestCSN());
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DirectoryServer.deregisterMonitorProvider(dbMonitor);
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DirectoryServer.registerMonitorProvider(dbMonitor);
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}
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/**
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* Add an update to the list of messages that must be saved to the db managed
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* by this db handler. This method is blocking if the size of the list of
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* message is larger than its maximum.
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*
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* @param updateMsg
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* The update message that must be saved to the db managed by this db
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* handler.
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* @throws ChangelogException
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* If a database problem happened
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*/
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public void add(UpdateMsg updateMsg) throws ChangelogException
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{
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if (shutdown.get())
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{
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throw new ChangelogException(
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ERR_COULD_NOT_ADD_CHANGE_TO_SHUTTING_DOWN_REPLICA_DB.get(updateMsg
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.toString(), String.valueOf(baseDN), String.valueOf(serverId)));
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}
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db.addEntry(updateMsg);
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final CSNLimits limits = csnLimits;
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final boolean updateNew = limits.newestCSN == null || limits.newestCSN.isOlderThan(updateMsg.getCSN());
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final boolean updateOld = limits.oldestCSN == null;
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if (updateOld || updateNew)
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{
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csnLimits = new CSNLimits(
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updateOld ? updateMsg.getCSN() : limits.oldestCSN,
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updateNew ? updateMsg.getCSN() : limits.newestCSN);
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}
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}
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/**
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* Get the oldest CSN that has not been purged yet.
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*
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* @return the oldest CSN that has not been purged yet.
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*/
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CSN getOldestCSN()
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{
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return csnLimits.oldestCSN;
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}
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/**
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* Get the newest CSN that has not been purged yet.
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*
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* @return the newest CSN that has not been purged yet.
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*/
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CSN getNewestCSN()
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{
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return csnLimits.newestCSN;
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}
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/**
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* Generate a new {@link DBCursor} that allows to browse the db managed by
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* this ReplicaDB and starting at the position defined by a given CSN.
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*
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* @param startCSN
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* The position where the cursor must start. If null, start from the
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* oldest CSN
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* @param positionStrategy
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* indicates at which exact position the cursor must start
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* @return a new {@link DBCursor} that allows to browse the db managed by this
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* ReplicaDB and starting at the position defined by a given CSN.
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* @throws ChangelogException
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* if a database problem happened
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*/
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DBCursor<UpdateMsg> generateCursorFrom(final CSN startCSN, final PositionStrategy positionStrategy)
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throws ChangelogException
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{
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return new JEReplicaDBCursor(db, startCSN, positionStrategy, this);
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}
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/**
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* Shutdown this ReplicaDB.
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*/
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void shutdown()
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{
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if (shutdown.compareAndSet(false, true))
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{
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db.shutdown();
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DirectoryServer.deregisterMonitorProvider(dbMonitor);
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}
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}
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/**
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* Synchronously purge changes older than purgeCSN from this replicaDB.
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*
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* @param purgeCSN
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* The CSN up to which changes can be purged. No purging happens when
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* it is {@code null}.
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* @throws ChangelogException
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* In case of database problem.
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*/
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void purgeUpTo(final CSN purgeCSN) throws ChangelogException
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{
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if (purgeCSN == null)
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{
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return;
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}
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for (int i = 0; i < 100; i++)
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{
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/*
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* the purge is done by group in order to save some CPU, IO bandwidth and
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* DB caches: start the transaction then do a bunch of remove then commit.
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*/
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/*
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* Matt wrote: The record removal is done as a DB transaction and the
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* deleted records are only "deleted" on commit. While the txn/cursor is
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* open the records to be deleted will, I think, be pinned in the DB
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* cache. In other words, the larger the transaction (the more records
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* deleted during a single batch) the more DB cache will be used to
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* process the transaction.
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*/
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final ReplServerDBCursor cursor = db.openDeleteCursor();
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try
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{
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for (int j = 0; j < 50; j++)
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{
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if (shutdown.get())
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{
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return;
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}
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CSN csn = cursor.nextCSN();
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if (csn == null)
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{
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return;
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}
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if (!csn.equals(csnLimits.newestCSN) && csn.isOlderThan(purgeCSN))
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{
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cursor.delete();
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}
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else
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{
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csnLimits = new CSNLimits(csn, csnLimits.newestCSN);
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return;
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}
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}
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}
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catch (ChangelogException e)
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{
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// mark shutdown for this db so that we don't try again to
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// stop it from cursor.close() or methods called by cursor.close()
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cursor.abort();
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shutdown.set(true);
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throw e;
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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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}
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/**
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* Implements monitoring capabilities of the ReplicaDB.
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*/
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private class DbMonitorProvider extends MonitorProvider<MonitorProviderCfg>
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{
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/** {@inheritDoc} */
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@Override
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public List<Attribute> getMonitorData()
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{
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final List<Attribute> attributes = new ArrayList<Attribute>();
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create(attributes, "replicationServer-database",String.valueOf(serverId));
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create(attributes, "domain-name", baseDN.toNormalizedString());
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final CSNLimits limits = csnLimits;
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if (limits.oldestCSN != null)
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{
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create(attributes, "first-change", encode(limits.oldestCSN));
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}
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if (limits.newestCSN != null)
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{
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create(attributes, "last-change", encode(limits.newestCSN));
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}
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return attributes;
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}
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private void create(final List<Attribute> attributes, final String name, final String value)
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{
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attributes.add(Attributes.create(name, value));
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}
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private String encode(final CSN csn)
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{
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return csn + " " + new Date(csn.getTime());
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}
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/** {@inheritDoc} */
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@Override
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public String getMonitorInstanceName()
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{
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ReplicationServerDomain domain = replicationServer.getReplicationServerDomain(baseDN);
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return "Changelog for DS(" + serverId + "),cn=" + domain.getMonitorInstanceName();
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}
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/** {@inheritDoc} */
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@Override
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public void initializeMonitorProvider(MonitorProviderCfg configuration)
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throws ConfigException,InitializationException
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{
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// Nothing to do for now
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}
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}
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/** {@inheritDoc} */
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@Override
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public String toString()
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{
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final CSNLimits limits = csnLimits;
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return getClass().getSimpleName() + " " + baseDN + " " + serverId + " "
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+ limits.oldestCSN + " " + limits.newestCSN;
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}
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/**
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* Clear the changes from this DB (from both memory cache and DB storage).
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* @throws ChangelogException When an exception occurs while removing the
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* changes from the DB.
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*/
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void clear() throws ChangelogException
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{
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db.clear();
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csnLimits = new CSNLimits(null, null);
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}
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/**
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* Getter for the serverID of the server for which this database is managed.
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*
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* @return the serverId.
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*/
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public int getServerId()
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{
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return this.serverId;
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}
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/**
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* Return the number of records of this replicaDB.
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* <p>
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* For test purpose.
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*
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* @return The number of records of this replicaDB.
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*/
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long getNumberRecords()
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{
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return db.getNumberRecords();
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}
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/**
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* Set the window size for writing counter records in the DB.
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* <p>
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* for unit tests only!!
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*
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* @param size
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* window size in number of records.
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*/
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void setCounterRecordWindowSize(int size)
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{
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db.setCounterRecordWindowSize(size);
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}
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}
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