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Library implementing Paxos and Heartbeat components required for High Availability Neo4j
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/*
* Copyright (c) 2018-2020 "Graph Foundation"
* Graph Foundation, Inc. [https://graphfoundation.org]
*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of ONgDB Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) as found
* in the associated LICENSE.txt file.
*
* 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.
*/
package org.neo4j.configuration;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.annotation.Nonnull;
import org.neo4j.graphdb.config.InvalidSettingException;
import org.neo4j.helpers.HostnamePort;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.configuration.ConfigurationValidator;
import org.neo4j.kernel.impl.enterprise.configuration.EnterpriseEditionSettings;
import org.neo4j.kernel.impl.enterprise.configuration.EnterpriseEditionSettings.Mode;
import org.neo4j.logging.Log;
import static org.neo4j.cluster.ClusterSettings.initial_hosts;
import static org.neo4j.cluster.ClusterSettings.server_id;
public class HaConfigurationValidator implements ConfigurationValidator
{
@Override
public Map validate( @Nonnull Config config, @Nonnull Log log ) throws InvalidSettingException
{
// Make sure mode is HA
Mode mode = config.get( EnterpriseEditionSettings.mode );
if ( mode.equals( Mode.HA ) || mode.equals( Mode.ARBITER ) )
{
validateServerId( config );
validateInitialHosts( config );
}
return Collections.emptyMap();
}
private static void validateServerId( Config config )
{
if ( !config.isConfigured( server_id ) )
{
throw new InvalidSettingException( String.format( "Missing mandatory value for '%s'", server_id.name() ) );
}
}
private static void validateInitialHosts( Config config )
{
List hosts = config.get( initial_hosts );
if ( hosts == null || hosts.isEmpty() )
{
throw new InvalidSettingException(
String.format( "Missing mandatory non-empty value for '%s'", initial_hosts.name() ) );
}
}
}