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LoadBalancingPluginLoader.java
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LoadBalancingPluginLoader.java
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/*
* Copyright (c) 2002-2018 "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.causalclustering.routing.load_balancing;
import java.util.HashSet;
import java.util.Set;
import org.neo4j.causalclustering.core.CausalClusteringSettings;
import org.neo4j.causalclustering.core.consensus.LeaderLocator;
import org.neo4j.causalclustering.discovery.TopologyService;
import org.neo4j.causalclustering.routing.load_balancing.plugins.ServerShufflingProcessor;
import org.neo4j.graphdb.config.InvalidSettingException;
import org.neo4j.helpers.Service;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
/**
* Loads and initialises any service implementations of <class>LoadBalancingPlugin</class>.
* Exposes configured instances of that interface via an iterator.
*/
public class LoadBalancingPluginLoader
{
private LoadBalancingPluginLoader()
{
}
public static void validate( Config config, Log log ) throws InvalidSettingException
{
LoadBalancingPlugin plugin = findPlugin( config );
plugin.validate( config, log );
}
public static LoadBalancingProcessor load( TopologyService topologyService, LeaderLocator leaderLocator,
LogProvider logProvider, Config config ) throws Throwable
{
LoadBalancingPlugin plugin = findPlugin( config );
plugin.init( topologyService, leaderLocator, logProvider, config );
if ( config.get( CausalClusteringSettings.load_balancing_shuffle ) )
{
return new ServerShufflingProcessor( plugin );
}
return plugin;
}
private static LoadBalancingPlugin findPlugin( Config config ) throws InvalidSettingException
{
Set<String> availableOptions = new HashSet<>();
Iterable<LoadBalancingPlugin> allImplementationsOnClasspath = Service.load( LoadBalancingPlugin.class );
String configuredName = config.get( CausalClusteringSettings.load_balancing_plugin );
for ( LoadBalancingPlugin plugin : allImplementationsOnClasspath )
{
if ( plugin.pluginName().equals( configuredName ) )
{
return plugin;
}
availableOptions.add( plugin.pluginName() );
}
throw new InvalidSettingException( String.format( "Could not find load balancing plugin with name: '%s'" +
" among available options: %s", configuredName, availableOptions ) );
}
}