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AllServersPlugin.java
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AllServersPlugin.java
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/*
* Copyright (c) 2002-2017 "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.load_balancing.plugins;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
import org.neo4j.causalclustering.core.CausalClusteringSettings;
import org.neo4j.causalclustering.core.consensus.LeaderLocator;
import org.neo4j.causalclustering.core.consensus.NoLeaderFoundException;
import org.neo4j.causalclustering.discovery.CoreTopology;
import org.neo4j.causalclustering.discovery.CoreTopologyService;
import org.neo4j.causalclustering.discovery.ReadReplicaTopology;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.causalclustering.load_balancing.Endpoint;
import org.neo4j.causalclustering.load_balancing.LoadBalancingResult;
import org.neo4j.causalclustering.load_balancing.LoadBalancingPlugin;
import org.neo4j.kernel.configuration.Config;
import static java.util.Collections.emptyList;
import static java.util.stream.Stream.concat;
import static org.neo4j.causalclustering.load_balancing.Util.extractBoltAddress;
import static org.neo4j.causalclustering.load_balancing.Util.asList;
/**
* This is just a simple plugin and not intended for actual use. Will be replaced.
*/
public class AllServersPlugin implements LoadBalancingPlugin
{
private final CoreTopologyService topologyService;
private final LeaderLocator leaderLocator;
private final Long timeToLive;
public AllServersPlugin( CoreTopologyService topologyService, LeaderLocator leaderLocator, Config config )
{
this.topologyService = topologyService;
this.leaderLocator = leaderLocator;
this.timeToLive = config.get( CausalClusteringSettings.cluster_routing_ttl );
}
@Override
public Result run( Map<String,String> context )
{
CoreTopology cores = topologyService.coreServers();
ReadReplicaTopology readers = topologyService.readReplicas();
return new LoadBalancingResult( routeEndpoints( cores ), writeEndpoints( cores ),
readEndpoints( cores, readers ), timeToLive );
}
private List<Endpoint> routeEndpoints( CoreTopology cores )
{
return cores.allMemberInfo().stream().map( extractBoltAddress() )
.map( Endpoint::route ).collect( Collectors.toList() );
}
private List<Endpoint> writeEndpoints( CoreTopology cores )
{
MemberId leader;
try
{
leader = leaderLocator.getLeader();
}
catch ( NoLeaderFoundException e )
{
return emptyList();
}
Optional<Endpoint> endPoint = cores.find( leader )
.map( extractBoltAddress() )
.map( Endpoint::write );
return asList( endPoint );
}
private List<Endpoint> readEndpoints( CoreTopology cores, ReadReplicaTopology readers )
{
return concat( readers.allMemberInfo().stream(), cores.allMemberInfo().stream() )
.map( extractBoltAddress() )
.map( Endpoint::read )
.collect( Collectors.toList() );
}
}