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ArbiterBootstrapper.java
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ArbiterBootstrapper.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.server.enterprise;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import org.jboss.netty.channel.ChannelException;
import org.neo4j.cluster.ClusterSettings;
import org.neo4j.cluster.client.ClusterClientModule;
import org.neo4j.cluster.protocol.election.NotElectableElectionCredentialsProvider;
import org.neo4j.function.Predicates;
import org.neo4j.helpers.collection.MapUtil;
import org.neo4j.helpers.collection.Pair;
import org.neo4j.io.fs.DefaultFileSystemAbstraction;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.kernel.impl.logging.StoreLogService;
import org.neo4j.kernel.impl.util.Dependencies;
import org.neo4j.kernel.impl.util.Neo4jJobScheduler;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.lifecycle.LifecycleException;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.FormattedLogProvider;
import org.neo4j.server.Bootstrapper;
import static org.neo4j.helpers.Exceptions.peel;
public class ArbiterBootstrapper implements Bootstrapper, AutoCloseable
{
private final LifeSupport life = new LifeSupport();
private final Timer timer = new Timer( true );
@SafeVarargs
@Override
public final int start( File configFile, Pair<String, String>... configOverrides )
{
Config config = getConfig( configFile, configOverrides );
try
{
life.add( new Neo4jJobScheduler() );
new ClusterClientModule(
life,
new Dependencies(),
new Monitors(),
config,
logService( new DefaultFileSystemAbstraction() ),
new NotElectableElectionCredentialsProvider() );
}
catch ( LifecycleException e )
{
@SuppressWarnings({"ThrowableResultOfMethodCallIgnored", "unchecked"})
Throwable cause = peel( e, Predicates.<Throwable>instanceOf( LifecycleException.class ) );
if ( cause instanceof ChannelException )
{
System.err.println( "ERROR: " + cause.getMessage() +
(cause.getCause() != null ? ", caused by:" + cause.getCause().getMessage() : "") );
}
else
{
System.err.println( "ERROR: Unknown error" );
throw e;
}
}
addShutdownHook();
life.start();
return 0;
}
@Override
public int stop()
{
life.shutdown();
return 0;
}
@Override
public void close()
{
stop();
}
@SafeVarargs
private static Config getConfig( File configFile, Pair<String, String>... configOverrides )
{
Map<String, String> config = new HashMap<>();
try
{
config.putAll( MapUtil.load( configFile ) );
}
catch ( IOException e )
{
throw new RuntimeException( "Unable to load config file " + configFile, e );
}
for ( Pair<String, String> configOverride : configOverrides )
{
config.put( configOverride.first(), configOverride.other() );
}
verifyConfig( config );
return new Config( config );
}
private static void verifyConfig( Map<String, String> config )
{
if ( !config.containsKey( ClusterSettings.initial_hosts.name() ) )
{
throw new IllegalArgumentException( "No initial hosts to connect to supplied" );
}
if ( !config.containsKey( ClusterSettings.server_id.name() ) )
{
throw new IllegalArgumentException( "No server id specified" );
}
}
private static LogService logService( FileSystemAbstraction fileSystem )
{
String logDir = System.getProperty( "org.neo4j.cluster.logdirectory", "data/log" );
try
{
return StoreLogService.withUserLogProvider( FormattedLogProvider.toOutputStream( System.out ) )
.inStoreDirectory( fileSystem, new File( logDir ) );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
private void addShutdownHook()
{
Runtime.getRuntime().addShutdownHook( new Thread()
{
@Override
public void run()
{
// ClusterJoin will block on a Future.get(), which will prevent it to shutdown.
// Adding a timer here in case a shutdown is requested before cluster join has succeeded. Otherwise
// the deadlock will prevent the shutdown from finishing.
timer.schedule( new TimerTask()
{
@Override
public void run()
{
System.err.println( "Failed to stop in a reasonable time, terminating..." );
Runtime.getRuntime().halt( 1 );
}
}, 4_000L );
ArbiterBootstrapper.this.stop();
}
} );
}
}