/*
|
* 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
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
|
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
|
* 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
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. 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 2009-2010 Sun Microsystems, Inc.
|
* Portions Copyright 2011-2013 ForgeRock AS
|
*/
|
package org.opends.server.replication.server.changelog.je;
|
|
import java.util.ArrayList;
|
import java.util.List;
|
import java.util.Map;
|
import java.util.concurrent.atomic.AtomicBoolean;
|
import java.util.concurrent.atomic.AtomicLong;
|
|
import org.opends.messages.MessageBuilder;
|
import org.opends.server.admin.std.server.MonitorProviderCfg;
|
import org.opends.server.api.DirectoryThread;
|
import org.opends.server.api.MonitorProvider;
|
import org.opends.server.config.ConfigException;
|
import org.opends.server.core.DirectoryServer;
|
import org.opends.server.loggers.debug.DebugTracer;
|
import org.opends.server.replication.common.CSN;
|
import org.opends.server.replication.common.MultiDomainServerState;
|
import org.opends.server.replication.common.ServerState;
|
import org.opends.server.replication.server.ReplicationServer;
|
import org.opends.server.replication.server.ReplicationServerDomain;
|
import org.opends.server.replication.server.changelog.api.*;
|
import org.opends.server.replication.server.changelog.je.DraftCNDB.*;
|
import org.opends.server.types.*;
|
|
import static org.opends.messages.ReplicationMessages.*;
|
import static org.opends.server.loggers.ErrorLogger.*;
|
import static org.opends.server.loggers.debug.DebugLogger.*;
|
import static org.opends.server.util.StaticUtils.*;
|
|
/**
|
* This class is used for managing the replicationServer database for each
|
* server in the topology. It is responsible for efficiently saving the updates
|
* that is received from each master server into stable storage. This class is
|
* also able to generate a {@link DBCursor} that can be used to read all changes
|
* from a given change number.
|
* <p>
|
* This class publishes some monitoring information below <code>
|
* cn=monitor</code>.
|
*/
|
public class JEChangeNumberIndexDB implements ChangeNumberIndexDB, Runnable
|
{
|
/**
|
* The tracer object for the debug logger.
|
*/
|
private static final DebugTracer TRACER = getTracer();
|
private static int NO_KEY = 0;
|
|
private DraftCNDB db;
|
/**
|
* FIXME Is this field that useful? {@link #getOldestChangeNumber()} does not
|
* even use it!
|
*/
|
private volatile long oldestChangeNumber = NO_KEY;
|
/**
|
* FIXME Is this field that useful? {@link #getNewestChangeNumber()} does not
|
* even use it!
|
*/
|
private volatile long newestChangeNumber = NO_KEY;
|
/** The last generated value for the change number. */
|
private final AtomicLong lastGeneratedChangeNumber;
|
private DbMonitorProvider dbMonitor = new DbMonitorProvider();
|
private final AtomicBoolean shutdown = new AtomicBoolean(false);
|
private volatile boolean trimDone = false;
|
/**
|
* A dedicated thread loops trim().
|
* <p>
|
* trim() : deletes from the DB a number of changes that are older than a
|
* certain date.
|
*/
|
private DirectoryThread trimmingThread;
|
/**
|
* The trim age in milliseconds. Changes record in the change DB that are
|
* older than this age are removed.
|
* <p>
|
* FIXME it never gets updated even when the replication server purge delay is
|
* updated
|
*/
|
private volatile long trimAge;
|
|
private ReplicationServer replicationServer;
|
|
|
/**
|
* Creates a new JEChangeNumberIndexDB associated to a given LDAP server.
|
*
|
* @param replicationServer The ReplicationServer that creates this instance.
|
* @param dbenv the Database Env to use to create the ReplicationServer DB.
|
* server for this domain.
|
* @throws ChangelogException If a database problem happened
|
*/
|
public JEChangeNumberIndexDB(ReplicationServer replicationServer,
|
ReplicationDbEnv dbenv) throws ChangelogException
|
{
|
this.replicationServer = replicationServer;
|
this.trimAge = replicationServer.getTrimAge();
|
|
// DB initialization
|
db = new DraftCNDB(dbenv);
|
final ChangeNumberIndexRecord oldestRecord = db.readFirstRecord();
|
final ChangeNumberIndexRecord newestRecord = db.readLastRecord();
|
oldestChangeNumber = getChangeNumber(oldestRecord);
|
newestChangeNumber = getChangeNumber(newestRecord);
|
// initialization of the lastGeneratedChangeNumber from the DB content
|
// if DB is empty => last record does not exist => default to 0
|
long newestCN = (newestRecord != null) ? newestRecord.getChangeNumber() : 0;
|
lastGeneratedChangeNumber = new AtomicLong(newestCN);
|
|
// Monitoring registration
|
DirectoryServer.deregisterMonitorProvider(dbMonitor);
|
DirectoryServer.registerMonitorProvider(dbMonitor);
|
}
|
|
/**
|
* Creates and starts the thread trimming the CNIndexDB.
|
*/
|
public void startTrimmingThread()
|
{
|
trimmingThread =
|
new DirectoryThread(this, "Replication ChangeNumberIndexDB Trimmer");
|
trimmingThread.start();
|
}
|
|
private long getChangeNumber(ChangeNumberIndexRecord record)
|
throws ChangelogException
|
{
|
if (record != null)
|
{
|
return record.getChangeNumber();
|
}
|
return 0;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public long addRecord(ChangeNumberIndexRecord record)
|
throws ChangelogException
|
{
|
long changeNumber = nextChangeNumber();
|
final ChangeNumberIndexRecord newRecord =
|
new ChangeNumberIndexRecord(changeNumber, record.getPreviousCookie(),
|
record.getBaseDN(), record.getCSN());
|
db.addRecord(newRecord);
|
|
if (debugEnabled())
|
TRACER.debugInfo("In JEChangeNumberIndexDB.add, added: " + newRecord);
|
return changeNumber;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public ChangeNumberIndexRecord getOldestRecord() throws ChangelogException
|
{
|
return db.readFirstRecord();
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public ChangeNumberIndexRecord getNewestRecord() throws ChangelogException
|
{
|
return db.readLastRecord();
|
}
|
|
private long nextChangeNumber()
|
{
|
return lastGeneratedChangeNumber.incrementAndGet();
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public long getLastGeneratedChangeNumber()
|
{
|
return lastGeneratedChangeNumber.get();
|
}
|
|
/**
|
* Get the number of changes.
|
* @return Returns the number of changes.
|
*/
|
public long count()
|
{
|
return db.count();
|
}
|
|
/**
|
* Returns whether this database is empty.
|
*
|
* @return <code>true</code> if this database is empty, <code>false</code>
|
* otherwise
|
* @throws ChangelogException
|
* if a database problem occurs.
|
*/
|
public boolean isEmpty() throws ChangelogException
|
{
|
return getNewestRecord() == null;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public DBCursor<ChangeNumberIndexRecord> getCursorFrom(long startChangeNumber)
|
throws ChangelogException
|
{
|
return new JEChangeNumberIndexDBCursor(db, startChangeNumber);
|
}
|
|
/**
|
* Shutdown this DB.
|
*/
|
public void shutdown()
|
{
|
if (shutdown.get())
|
{
|
return;
|
}
|
|
shutdown.set(true);
|
synchronized (this)
|
{
|
notifyAll();
|
}
|
|
synchronized (this)
|
{ /* Can we just do a thread.join() ? */
|
while (!trimDone)
|
{
|
try
|
{
|
wait();
|
} catch (InterruptedException e)
|
{ /* do nothing */ }
|
}
|
}
|
|
db.shutdown();
|
DirectoryServer.deregisterMonitorProvider(dbMonitor);
|
}
|
|
/**
|
* Run method for this class.
|
* Periodically Flushes the ReplicationServerDomain cache from memory to the
|
* stable storage and trims the old updates.
|
*/
|
@Override
|
public void run()
|
{
|
while (!shutdown.get())
|
{
|
try {
|
trim(shutdown);
|
|
synchronized (this)
|
{
|
try
|
{
|
wait(1000);
|
} catch (InterruptedException e)
|
{
|
Thread.currentThread().interrupt();
|
}
|
}
|
} catch (Exception end)
|
{
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_EXCEPTION_CHANGELOG_TRIM_FLUSH.get());
|
mb.append(" ");
|
mb.append(stackTraceToSingleLineString(end));
|
logError(mb.toMessage());
|
if (replicationServer != null)
|
replicationServer.shutdown();
|
break;
|
}
|
}
|
|
synchronized (this)
|
{
|
trimDone = true;
|
notifyAll();
|
}
|
}
|
|
/**
|
* Trim old changes from this database.
|
* @throws ChangelogException In case of database problem.
|
*/
|
private void trim(AtomicBoolean shutdown) throws ChangelogException
|
{
|
if (trimAge == 0)
|
return;
|
|
clear(null, shutdown);
|
}
|
|
/**
|
* Clear the changes from this DB (from both memory cache and DB storage) for
|
* the provided baseDN.
|
*
|
* @param baseDNToClear
|
* The baseDN for which we want to remove all records from this DB,
|
* null means all.
|
* @throws ChangelogException
|
* if a database problem occurs.
|
*/
|
public void clear(DN baseDNToClear) throws ChangelogException
|
{
|
clear(baseDNToClear, null);
|
}
|
|
private void clear(DN baseDNToClear, AtomicBoolean shutdown)
|
throws ChangelogException
|
{
|
if (isEmpty())
|
{
|
return;
|
}
|
|
for (int i = 0; i < 100; i++)
|
{
|
if (mustShutdown(shutdown))
|
{
|
return;
|
}
|
final DraftCNDBCursor cursor = db.openDeleteCursor();
|
try
|
{
|
for (int j = 0; j < 50; j++)
|
{
|
// let's traverse the CNIndexDB
|
if (mustShutdown(shutdown) || !cursor.next())
|
{
|
cursor.close();
|
return;
|
}
|
|
final ChangeNumberIndexRecord record = cursor.currentRecord();
|
if (baseDNToClear != null && baseDNToClear.equals(record.getBaseDN()))
|
{
|
cursor.delete();
|
continue;
|
}
|
|
final ReplicationServerDomain domain =
|
replicationServer.getReplicationServerDomain(record.getBaseDN());
|
if (domain == null)
|
{
|
// the domain has been removed since the record was written in the
|
// CNIndexDB, thus it makes no sense to keep this record in the DB.
|
cursor.delete();
|
continue;
|
}
|
|
// FIXME there is an opportunity for a phantom record in the CNIndexDB
|
// if the replicaDB gets purged after call to domain.getOldestState().
|
final CSN csn = record.getCSN();
|
final ServerState oldestState = domain.getOldestState();
|
final CSN fcsn = oldestState.getCSN(csn.getServerId());
|
if (csn.isOlderThan(fcsn))
|
{
|
// This change which has already been purged from the corresponding
|
// replicaDB => purge it from CNIndexDB
|
cursor.delete();
|
continue;
|
}
|
|
ServerState csnVector;
|
try
|
{
|
Map<DN, ServerState> csnStartStates =
|
MultiDomainServerState.splitGenStateToServerStates(
|
record.getPreviousCookie());
|
csnVector = csnStartStates.get(record.getBaseDN());
|
|
if (debugEnabled())
|
TRACER.debugInfo("JEChangeNumberIndexDB:clear() - ChangeVector:"
|
+ csnVector + " -- StartState:" + oldestState);
|
}
|
catch(Exception e)
|
{
|
// We could not parse the MultiDomainServerState from the record
|
// FIXME this is quite an aggressive delete()
|
cursor.delete();
|
continue;
|
}
|
|
if (csnVector == null
|
|| (csnVector.getCSN(csn.getServerId()) != null
|
&& !csnVector.cover(oldestState)))
|
{
|
cursor.delete();
|
if (debugEnabled())
|
TRACER.debugInfo("JEChangeNumberIndexDB:clear() - deleted " + csn
|
+ "Not covering startState");
|
continue;
|
}
|
|
oldestChangeNumber = record.getChangeNumber();
|
cursor.close();
|
return;
|
}
|
|
cursor.close();
|
}
|
catch (ChangelogException e)
|
{
|
// mark shutdown for this db so that we don't try again to
|
// stop it from cursor.close() or methods called by cursor.close()
|
cursor.abort();
|
shutdown.set(true);
|
throw e;
|
}
|
catch (Exception e)
|
{
|
// mark shutdown for this db so that we don't try again to
|
// stop it from cursor.close() or methods called by cursor.close()
|
cursor.abort();
|
shutdown.set(true);
|
throw new ChangelogException(e);
|
}
|
}
|
}
|
|
private boolean mustShutdown(AtomicBoolean shutdown)
|
{
|
return shutdown != null && shutdown.get();
|
}
|
|
/**
|
* This internal class is used to implement the Monitoring capabilities of the
|
* JEChangeNumberIndexDB.
|
*/
|
private class DbMonitorProvider extends MonitorProvider<MonitorProviderCfg>
|
{
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public List<Attribute> getMonitorData()
|
{
|
List<Attribute> attributes = new ArrayList<Attribute>();
|
attributes.add(createChangeNumberAttribute(true));
|
attributes.add(createChangeNumberAttribute(false));
|
attributes.add(Attributes.create("count", Long.toString(count())));
|
return attributes;
|
}
|
|
private Attribute createChangeNumberAttribute(boolean isFirst)
|
{
|
final String attributeName =
|
isFirst ? "first-draft-changenumber" : "last-draft-changenumber";
|
final String changeNumber = String.valueOf(getChangeNumber(isFirst));
|
return Attributes.create(attributeName, changeNumber);
|
}
|
|
private long getChangeNumber(boolean isFirst)
|
{
|
try
|
{
|
final ChangeNumberIndexRecord record =
|
isFirst ? db.readFirstRecord() : db.readLastRecord();
|
if (record != null)
|
{
|
return record.getChangeNumber();
|
}
|
}
|
catch (ChangelogException e)
|
{
|
if (debugEnabled())
|
TRACER.debugCaught(DebugLogLevel.WARNING, e);
|
}
|
return 0;
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String getMonitorInstanceName()
|
{
|
return "ChangeNumber Index Database";
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public void initializeMonitorProvider(MonitorProviderCfg configuration)
|
throws ConfigException,InitializationException
|
{
|
// Nothing to do for now
|
}
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String toString()
|
{
|
return getClass().getSimpleName() + ": " + oldestChangeNumber + " "
|
+ newestChangeNumber;
|
}
|
|
/**
|
* Set the Purge delay for this db Handler.
|
* @param delay The purge delay in Milliseconds.
|
*/
|
public void setPurgeDelay(long delay)
|
{
|
trimAge = delay;
|
}
|
|
/**
|
* Clear the changes from this DB (from both memory cache and DB storage).
|
*
|
* @throws ChangelogException
|
* if a database problem occurs.
|
*/
|
public void clear() throws ChangelogException
|
{
|
db.clear();
|
oldestChangeNumber = getChangeNumber(db.readFirstRecord());
|
newestChangeNumber = getChangeNumber(db.readLastRecord());
|
}
|
|
}
|
