/*
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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 2013-2014 ForgeRock AS
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*/
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package org.opends.server.replication.server.changelog.je;
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import java.io.File;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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import org.opends.messages.Message;
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import org.opends.messages.MessageBuilder;
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import org.opends.server.admin.std.server.ReplicationServerCfg;
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import org.opends.server.api.DirectoryThread;
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import org.opends.server.config.ConfigException;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.common.ServerState;
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import org.opends.server.replication.protocol.UpdateMsg;
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import org.opends.server.replication.server.ChangelogState;
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import org.opends.server.replication.server.ReplicationServer;
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import org.opends.server.replication.server.changelog.api.*;
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import org.opends.server.types.DN;
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import org.opends.server.types.DebugLogLevel;
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import org.opends.server.util.StaticUtils;
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import org.opends.server.util.TimeThread;
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import com.forgerock.opendj.util.Pair;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* JE implementation of the ChangelogDB interface.
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*/
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public class JEChangelogDB implements ChangelogDB, ReplicationDomainDB
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{
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/** The tracer object for the debug logger. */
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private static final DebugTracer TRACER = getTracer();
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/**
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* This map contains the List of updates received from each LDAP server.
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* <p>
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* When removing a domainMap, code:
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* <ol>
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* <li>first get the domainMap</li>
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* <li>synchronized on the domainMap</li>
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* <li>remove the domainMap</li>
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* <li>then check it's not null</li>
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* <li>then close all inside</li>
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* </ol>
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* When creating a JEReplicaDB, synchronize on the domainMap to avoid
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* concurrent shutdown.
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*/
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private final ConcurrentMap<DN, ConcurrentMap<Integer, JEReplicaDB>>
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domainToReplicaDBs =
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new ConcurrentHashMap<DN, ConcurrentMap<Integer, JEReplicaDB>>();
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private ReplicationDbEnv dbEnv;
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private ReplicationServerCfg config;
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private final File dbDirectory;
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/**
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* The handler of the changelog database, the database stores the relation
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* between a change number and the associated cookie.
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* <p>
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* @GuardedBy("cnIndexDBLock")
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*/
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private JEChangeNumberIndexDB cnIndexDB;
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private final AtomicReference<ChangeNumberIndexer> cnIndexer =
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new AtomicReference<ChangeNumberIndexer>();
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/** Used for protecting {@link ChangeNumberIndexDB} related state. */
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private final Object cnIndexDBLock = new Object();
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/**
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* The purge delay (in milliseconds). Records in the changelog DB that are
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* older than this delay might be removed.
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*/
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private long purgeDelayInMillis;
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private final AtomicReference<ChangelogDBPurger> cnPurger =
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new AtomicReference<ChangelogDBPurger>();
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private volatile long latestPurgeDate;
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/** The local replication server. */
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private final ReplicationServer replicationServer;
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private AtomicBoolean shutdown = new AtomicBoolean();
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private static final DBCursor<UpdateMsg> EMPTY_CURSOR =
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new DBCursor<UpdateMsg>()
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{
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@Override
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public boolean next()
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{
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return false;
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}
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@Override
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public UpdateMsg getRecord()
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{
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return null;
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}
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@Override
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public void close()
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{
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// empty
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}
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@Override
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public String toString()
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{
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return "EmptyDBCursor<UpdateMsg>";
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}
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};
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/**
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* Builds an instance of this class.
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*
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* @param replicationServer
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* the local replication server.
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* @param config
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* the replication server configuration
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* @throws ConfigException
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* if a problem occurs opening the supplied directory
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*/
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public JEChangelogDB(ReplicationServer replicationServer,
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ReplicationServerCfg config) throws ConfigException
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{
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this.config = config;
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this.replicationServer = replicationServer;
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this.dbDirectory = makeDir(config.getReplicationDBDirectory());
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}
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private File makeDir(String dbDirName) throws ConfigException
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{
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// Check that this path exists or create it.
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File dbDirectory = getFileForPath(dbDirName);
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try
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{
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if (!dbDirectory.exists())
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{
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dbDirectory.mkdir();
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}
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return dbDirectory;
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}
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catch (Exception e)
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{
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if (debugEnabled())
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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final MessageBuilder mb = new MessageBuilder();
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mb.append(e.getLocalizedMessage());
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mb.append(" ");
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mb.append(String.valueOf(dbDirectory));
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Message msg = ERR_FILE_CHECK_CREATE_FAILED.get(mb.toString());
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throw new ConfigException(msg, e);
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}
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}
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private Map<Integer, JEReplicaDB> getDomainMap(DN baseDN)
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{
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final Map<Integer, JEReplicaDB> domainMap = domainToReplicaDBs.get(baseDN);
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if (domainMap != null)
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{
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return domainMap;
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}
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return Collections.emptyMap();
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}
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private JEReplicaDB getReplicaDB(DN baseDN, int serverId)
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{
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return getDomainMap(baseDN).get(serverId);
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}
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/**
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* Provision resources for the specified serverId in the specified replication
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* domain.
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*
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* @param baseDN
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* the replication domain where to add the serverId
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* @param serverId
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* the server Id to add to the replication domain
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* @throws ChangelogException
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* If a database error happened.
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*/
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private void commission(DN baseDN, int serverId, ReplicationServer rs)
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throws ChangelogException
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{
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getOrCreateReplicaDB(baseDN, serverId, rs);
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}
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/**
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* Returns a {@link JEReplicaDB}, possibly creating it.
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*
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* @param baseDN
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* the baseDN for which to create a ReplicaDB
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* @param serverId
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* the serverId for which to create a ReplicaDB
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* @param rs
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* the ReplicationServer
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* @return a Pair with the JEReplicaDB and a boolean indicating whether it had
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* to be created
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* @throws ChangelogException
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* if a problem occurred with the database
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*/
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Pair<JEReplicaDB, Boolean> getOrCreateReplicaDB(DN baseDN,
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int serverId, ReplicationServer rs) throws ChangelogException
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{
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while (!shutdown.get())
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{
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final ConcurrentMap<Integer, JEReplicaDB> domainMap =
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getExistingOrNewDomainMap(baseDN);
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final Pair<JEReplicaDB, Boolean> result =
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getExistingOrNewReplicaDB(domainMap, serverId, baseDN, rs);
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if (result != null)
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{
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return result;
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}
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}
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throw new ChangelogException(
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ERR_CANNOT_CREATE_REPLICA_DB_BECAUSE_CHANGELOG_DB_SHUTDOWN.get());
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}
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private ConcurrentMap<Integer, JEReplicaDB> getExistingOrNewDomainMap(
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DN baseDN)
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{
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// happy path: the domainMap already exists
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final ConcurrentMap<Integer, JEReplicaDB> currentValue =
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domainToReplicaDBs.get(baseDN);
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if (currentValue != null)
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{
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return currentValue;
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}
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// unlucky, the domainMap does not exist: take the hit and create the
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// newValue, even though the same could be done concurrently by another
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// thread
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final ConcurrentMap<Integer, JEReplicaDB> newValue =
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new ConcurrentHashMap<Integer, JEReplicaDB>();
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final ConcurrentMap<Integer, JEReplicaDB> previousValue =
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domainToReplicaDBs.putIfAbsent(baseDN, newValue);
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if (previousValue != null)
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{
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// there was already a value associated to the key, let's use it
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return previousValue;
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}
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return newValue;
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}
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private Pair<JEReplicaDB, Boolean> getExistingOrNewReplicaDB(
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final ConcurrentMap<Integer, JEReplicaDB> domainMap, int serverId,
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DN baseDN, ReplicationServer rs) throws ChangelogException
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{
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// happy path: the JEReplicaDB already exists
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JEReplicaDB currentValue = domainMap.get(serverId);
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if (currentValue != null)
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{
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return Pair.of(currentValue, false);
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}
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// unlucky, the JEReplicaDB does not exist: take the hit and synchronize
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// on the domainMap to create a new ReplicaDB
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synchronized (domainMap)
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{
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// double-check
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currentValue = domainMap.get(serverId);
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if (currentValue != null)
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{
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return Pair.of(currentValue, false);
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}
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if (domainToReplicaDBs.get(baseDN) != domainMap)
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{
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// the domainMap could have been concurrently removed because
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// 1) a shutdown was initiated or 2) an initialize was called.
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// Return will allow the code to:
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// 1) shutdown properly or 2) lazily recreate the JEReplicaDB
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return null;
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}
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final JEReplicaDB newValue = new JEReplicaDB(serverId, baseDN, rs, dbEnv);
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domainMap.put(serverId, newValue);
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return Pair.of(newValue, true);
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}
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}
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/** {@inheritDoc} */
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@Override
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public void initializeDB()
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{
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try
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{
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final File dbDir = getFileForPath(config.getReplicationDBDirectory());
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dbEnv = new ReplicationDbEnv(dbDir.getAbsolutePath(), replicationServer);
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final ChangelogState changelogState = dbEnv.readChangelogState();
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initializeChangelogState(changelogState);
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if (config.isComputeChangeNumber())
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{
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startIndexer(changelogState);
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}
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setPurgeDelay(replicationServer.getPurgeDelay());
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}
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catch (ChangelogException e)
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{
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if (debugEnabled())
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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logError(ERR_COULD_NOT_READ_DB.get(this.dbDirectory.getAbsolutePath(),
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e.getLocalizedMessage()));
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}
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}
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private void initializeChangelogState(final ChangelogState changelogState)
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throws ChangelogException
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{
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for (Map.Entry<DN, Long> entry :
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changelogState.getDomainToGenerationId().entrySet())
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{
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replicationServer.getReplicationServerDomain(entry.getKey(), true)
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.initGenerationID(entry.getValue());
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}
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for (Map.Entry<DN, List<Integer>> entry :
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changelogState.getDomainToServerIds().entrySet())
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{
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for (int serverId : entry.getValue())
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{
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commission(entry.getKey(), serverId, replicationServer);
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}
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}
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}
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private void shutdownCNIndexDB() throws ChangelogException
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{
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synchronized (cnIndexDBLock)
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{
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if (cnIndexDB != null)
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{
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cnIndexDB.shutdown();
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}
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}
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}
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/** {@inheritDoc} */
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@Override
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public void shutdownDB() throws ChangelogException
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{
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if (!this.shutdown.compareAndSet(false, true))
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{ // shutdown has already been initiated
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return;
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}
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// Remember the first exception because :
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// - we want to try to remove everything we want to remove
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// - then throw the first encountered exception
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ChangelogException firstException = null;
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final ChangeNumberIndexer indexer = cnIndexer.getAndSet(null);
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if (indexer != null)
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{
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indexer.initiateShutdown();
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}
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final ChangelogDBPurger purger = cnPurger.getAndSet(null);
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if (purger != null)
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{
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purger.initiateShutdown();
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}
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try
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{
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shutdownCNIndexDB();
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}
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catch (ChangelogException e)
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{
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firstException = e;
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}
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for (Iterator<ConcurrentMap<Integer, JEReplicaDB>> it =
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this.domainToReplicaDBs.values().iterator(); it.hasNext();)
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{
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final ConcurrentMap<Integer, JEReplicaDB> domainMap = it.next();
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synchronized (domainMap)
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{
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it.remove();
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for (JEReplicaDB replicaDB : domainMap.values())
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{
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replicaDB.shutdown();
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}
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}
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}
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if (dbEnv != null)
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{
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// wait for shutdown of the threads holding cursors
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try
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{
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if (indexer != null)
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{
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indexer.join();
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}
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if (purger != null)
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{
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purger.join();
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}
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}
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catch (InterruptedException e)
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{
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// do nothing: we are already shutting down
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}
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dbEnv.shutdown();
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}
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if (firstException != null)
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{
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throw firstException;
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}
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}
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/**
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* Clears all content from the changelog database, but leaves its directory on
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* the filesystem.
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*
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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 clearDB() throws ChangelogException
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{
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if (!dbDirectory.exists())
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{
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return;
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}
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// Remember the first exception because :
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// - we want to try to remove everything we want to remove
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// - then throw the first encountered exception
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ChangelogException firstException = null;
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final ChangeNumberIndexer indexer = cnIndexer.get();
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if (indexer != null)
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{
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indexer.clear();
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}
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for (DN baseDN : this.domainToReplicaDBs.keySet())
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{
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removeDomain(baseDN);
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}
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synchronized (cnIndexDBLock)
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{
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if (cnIndexDB != null)
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{
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try
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{
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cnIndexDB.clear();
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}
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catch (ChangelogException e)
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{
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firstException = e;
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}
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try
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{
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shutdownCNIndexDB();
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}
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catch (ChangelogException e)
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{
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if (firstException == null)
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{
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firstException = e;
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}
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else if (debugEnabled())
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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cnIndexDB = null;
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}
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}
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if (firstException != null)
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{
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throw firstException;
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}
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}
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/** {@inheritDoc} */
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@Override
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public void removeDB() throws ChangelogException
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{
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shutdownDB();
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StaticUtils.recursiveDelete(dbDirectory);
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}
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/** {@inheritDoc} */
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@Override
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public ServerState getDomainOldestCSNs(DN baseDN)
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{
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final ServerState result = new ServerState();
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for (JEReplicaDB replicaDB : getDomainMap(baseDN).values())
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{
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result.update(replicaDB.getOldestCSN());
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}
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return result;
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}
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/** {@inheritDoc} */
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@Override
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public ServerState getDomainNewestCSNs(DN baseDN)
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{
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final ServerState result = new ServerState();
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for (JEReplicaDB replicaDB : getDomainMap(baseDN).values())
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{
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result.update(replicaDB.getNewestCSN());
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}
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return result;
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}
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/** {@inheritDoc} */
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@Override
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public void removeDomain(DN baseDN) throws ChangelogException
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{
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// Remember the first exception because :
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// - we want to try to remove everything we want to remove
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// - then throw the first encountered exception
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ChangelogException firstException = null;
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// 1- clear the replica DBs
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Map<Integer, JEReplicaDB> domainMap = domainToReplicaDBs.get(baseDN);
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if (domainMap != null)
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{
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synchronized (domainMap)
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{
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domainMap = domainToReplicaDBs.remove(baseDN);
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for (JEReplicaDB replicaDB : domainMap.values())
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{
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try
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{
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replicaDB.clear();
|
}
|
catch (ChangelogException e)
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{
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firstException = e;
|
}
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replicaDB.shutdown();
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}
|
}
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}
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// 2- clear the ChangeNumber index DB
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synchronized (cnIndexDBLock)
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{
|
if (cnIndexDB != null)
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{
|
try
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{
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cnIndexDB.removeDomain(baseDN);
|
}
|
catch (ChangelogException e)
|
{
|
if (firstException == null)
|
{
|
firstException = e;
|
}
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else if (debugEnabled())
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
|
}
|
}
|
}
|
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// 3- clear the changelogstate DB
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try
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{
|
dbEnv.clearGenerationId(baseDN);
|
}
|
catch (ChangelogException e)
|
{
|
if (firstException == null)
|
{
|
firstException = e;
|
}
|
else if (debugEnabled())
|
{
|
TRACER.debugCaught(DebugLogLevel.ERROR, e);
|
}
|
}
|
|
if (firstException != null)
|
{
|
throw firstException;
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
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public void setPurgeDelay(long purgeDelayInMillis)
|
{
|
this.purgeDelayInMillis = purgeDelayInMillis;
|
final ChangelogDBPurger purger;
|
if (purgeDelayInMillis > 0)
|
{
|
purger = new ChangelogDBPurger();
|
if (cnPurger.compareAndSet(null, purger))
|
{
|
purger.start();
|
} // otherwise a purger was already running
|
}
|
else
|
{
|
purger = cnPurger.getAndSet(null);
|
if (purger != null)
|
{
|
purger.initiateShutdown();
|
}
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void setComputeChangeNumber(boolean computeChangeNumber)
|
throws ChangelogException
|
{
|
if (computeChangeNumber)
|
{
|
startIndexer(dbEnv.readChangelogState());
|
}
|
else
|
{
|
final ChangeNumberIndexer indexer = cnIndexer.getAndSet(null);
|
if (indexer != null)
|
{
|
indexer.initiateShutdown();
|
}
|
}
|
}
|
|
private void startIndexer(final ChangelogState changelogState)
|
{
|
final ChangeNumberIndexer indexer =
|
new ChangeNumberIndexer(this, changelogState);
|
if (cnIndexer.compareAndSet(null, indexer))
|
{
|
indexer.start();
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public long getDomainLatestTrimDate(DN baseDN)
|
{
|
return latestPurgeDate;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public ChangeNumberIndexDB getChangeNumberIndexDB()
|
{
|
synchronized (cnIndexDBLock)
|
{
|
if (cnIndexDB == null)
|
{
|
try
|
{
|
cnIndexDB = new JEChangeNumberIndexDB(this.dbEnv);
|
}
|
catch (Exception e)
|
{
|
if (debugEnabled())
|
TRACER.debugCaught(DebugLogLevel.ERROR, e);
|
logError(ERR_CHANGENUMBER_DATABASE.get(e.getLocalizedMessage()));
|
}
|
}
|
return cnIndexDB;
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public ReplicationDomainDB getReplicationDomainDB()
|
{
|
return this;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public DBCursor<UpdateMsg> getCursorFrom(DN baseDN,
|
ServerState startAfterServerState) throws ChangelogException
|
{
|
final Set<Integer> serverIds = getDomainMap(baseDN).keySet();
|
final Map<DBCursor<UpdateMsg>, Void> cursors =
|
new HashMap<DBCursor<UpdateMsg>, Void>(serverIds.size());
|
for (int serverId : serverIds)
|
{
|
// get the last already sent CSN from that server to get a cursor
|
final CSN lastCSN = startAfterServerState != null ?
|
startAfterServerState.getCSN(serverId) : null;
|
cursors.put(getCursorFrom(baseDN, serverId, lastCSN), null);
|
}
|
// recycle exhausted cursors,
|
// because client code will not manage the cursors itself
|
return new CompositeDBCursor<Void>(cursors, true);
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public DBCursor<UpdateMsg> getCursorFrom(DN baseDN, int serverId,
|
CSN startAfterCSN) throws ChangelogException
|
{
|
JEReplicaDB replicaDB = getReplicaDB(baseDN, serverId);
|
if (replicaDB != null)
|
{
|
DBCursor<UpdateMsg> cursor = replicaDB.generateCursorFrom(startAfterCSN);
|
cursor.next();
|
return cursor;
|
}
|
return EMPTY_CURSOR;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public boolean publishUpdateMsg(DN baseDN, UpdateMsg updateMsg)
|
throws ChangelogException
|
{
|
final Pair<JEReplicaDB, Boolean> pair = getOrCreateReplicaDB(baseDN,
|
updateMsg.getCSN().getServerId(), replicationServer);
|
final JEReplicaDB replicaDB = pair.getFirst();
|
final boolean wasCreated = pair.getSecond();
|
|
replicaDB.add(updateMsg);
|
final ChangeNumberIndexer indexer = cnIndexer.get();
|
if (indexer != null)
|
{
|
notifyReplicaOnline(indexer, baseDN, updateMsg.getCSN().getServerId());
|
indexer.publishUpdateMsg(baseDN, updateMsg);
|
}
|
return wasCreated;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void replicaHeartbeat(DN baseDN, CSN heartbeatCSN) throws ChangelogException
|
{
|
final ChangeNumberIndexer indexer = cnIndexer.get();
|
if (indexer != null)
|
{
|
notifyReplicaOnline(indexer, baseDN, heartbeatCSN.getServerId());
|
indexer.publishHeartbeat(baseDN, heartbeatCSN);
|
}
|
}
|
|
private void notifyReplicaOnline(final ChangeNumberIndexer indexer, final DN baseDN, final int serverId)
|
throws ChangelogException
|
{
|
if (indexer.isReplicaOffline(baseDN, serverId))
|
{
|
dbEnv.notifyReplicaOnline(baseDN, serverId);
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void notifyReplicaOffline(DN baseDN, CSN offlineCSN)
|
throws ChangelogException
|
{
|
dbEnv.notifyReplicaOffline(baseDN, offlineCSN);
|
final ChangeNumberIndexer indexer = cnIndexer.get();
|
if (indexer != null)
|
{
|
indexer.replicaOffline(baseDN, offlineCSN);
|
}
|
}
|
|
/**
|
* The thread purging the changelogDB on a regular interval. Records are
|
* purged from the changelogDB is they are older than a delay specified in
|
* seconds. The purge process works in two steps:
|
* <ol>
|
* <li>first purge the changeNumberIndexDB and retrieve information to drive
|
* replicaDBs purging</li>
|
* <li>proceed to purge each replicaDBs based on the information collected
|
* when purging the changeNumberIndexDB</li>
|
* </ol>
|
*/
|
private final class ChangelogDBPurger extends DirectoryThread
|
{
|
private static final int DEFAULT_SLEEP = 500;
|
|
protected ChangelogDBPurger()
|
{
|
super("changelog DB purger");
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void run()
|
{
|
// initialize CNIndexDB
|
getChangeNumberIndexDB();
|
while (!isShutdownInitiated())
|
{
|
try
|
{
|
final long purgeTimestamp = TimeThread.getTime() - purgeDelayInMillis;
|
final CSN purgeCSN = new CSN(purgeTimestamp, 0, 0);
|
final CSN oldestNotPurgedCSN;
|
|
// next code assumes that the compute-change-number config
|
// never changes during the life time of an RS
|
if (!config.isComputeChangeNumber())
|
{
|
oldestNotPurgedCSN = purgeCSN;
|
}
|
else
|
{
|
final JEChangeNumberIndexDB localCNIndexDB = cnIndexDB;
|
if (localCNIndexDB == null)
|
{ // shutdown has been initiated
|
return;
|
}
|
|
oldestNotPurgedCSN = localCNIndexDB.purgeUpTo(purgeCSN);
|
if (oldestNotPurgedCSN == null)
|
{ // shutdown may have been initiated...
|
// ... or the change number index DB is empty,
|
// wait for new changes to come in.
|
|
// Note we cannot sleep for as long as the purge delay
|
// (3 days default), because we might receive late updates
|
// that will have to be purged before the purge delay elapses.
|
// This can particularly happen in case of network partitions.
|
jeFriendlySleep(DEFAULT_SLEEP);
|
continue;
|
}
|
}
|
|
for (final Map<Integer, JEReplicaDB> domainMap
|
: domainToReplicaDBs.values())
|
{
|
for (final JEReplicaDB replicaDB : domainMap.values())
|
{
|
replicaDB.purgeUpTo(oldestNotPurgedCSN);
|
}
|
}
|
|
latestPurgeDate = purgeTimestamp;
|
|
jeFriendlySleep(computeSleepTimeUntilNextPurge(oldestNotPurgedCSN));
|
}
|
catch (InterruptedException e)
|
{
|
// shutdown initiated?
|
}
|
catch (Exception e)
|
{
|
logError(ERR_EXCEPTION_CHANGELOG_TRIM_FLUSH
|
.get(stackTraceToSingleLineString(e)));
|
if (replicationServer != null)
|
{
|
replicationServer.shutdown();
|
}
|
}
|
}
|
}
|
|
/**
|
* This method implements a sleep() that is friendly to Berkeley JE.
|
* <p>
|
* Originally, {@link Thread#sleep(long)} was used , but waking up a
|
* sleeping threads required calling {@link Thread#interrupt()}, and JE
|
* threw exceptions when invoked on interrupted threads.
|
* <p>
|
* The solution is to replace:
|
* <ol>
|
* <li> {@link Thread#sleep()} with {@link Object#wait(long)}</li>
|
* <li> {@link Thread#interrupt()} with {@link Object#notify()}</li>
|
* </ol>
|
*/
|
private void jeFriendlySleep(long millis) throws InterruptedException
|
{
|
if (!isShutdownInitiated())
|
{
|
synchronized (this)
|
{
|
if (!isShutdownInitiated())
|
{
|
wait(millis);
|
}
|
}
|
}
|
}
|
|
private long computeSleepTimeUntilNextPurge(CSN notPurgedCSN)
|
{
|
final long nextPurgeTime = notPurgedCSN.getTime();
|
final long currentPurgeTime = TimeThread.getTime() - purgeDelayInMillis;
|
if (currentPurgeTime <= nextPurgeTime)
|
{
|
// sleep till the next CSN to purge,
|
return nextPurgeTime - currentPurgeTime;
|
}
|
// wait a bit before purging more
|
return DEFAULT_SLEEP;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void initiateShutdown()
|
{
|
super.initiateShutdown();
|
synchronized (this)
|
{
|
notify(); // wake up the purger thread for faster shutdown
|
}
|
}
|
}
|
}
|
