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HazelcastClusterTopology.java
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HazelcastClusterTopology.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.coreedge.discovery;
import java.io.Serializable;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;
import com.hazelcast.config.MemberAttributeConfig;
import com.hazelcast.core.Client;
import com.hazelcast.core.ClientService;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.HazelcastInstanceAware;
import com.hazelcast.core.IExecutorService;
import com.hazelcast.core.Member;
import org.neo4j.coreedge.core.CoreEdgeClusterSettings;
import org.neo4j.coreedge.edge.EnterpriseEdgeEditionModule;
import org.neo4j.coreedge.identity.MemberId;
import org.neo4j.coreedge.messaging.address.AdvertisedSocketAddress;
import org.neo4j.helpers.collection.Pair;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.logging.Log;
import static java.util.Collections.emptySet;
import static java.util.stream.Collectors.toSet;
class HazelcastClusterTopology
{
static final String EDGE_SERVER_BOLT_ADDRESS_MAP_NAME = "edge-servers"; // hz client uuid string -> boltAddress string
static final String MEMBER_UUID = "member_uuid";
static final String TRANSACTION_SERVER = "transaction_server";
static final String RAFT_SERVER = "raft_server";
static final String BOLT_SERVER = "bolt_server";
static ClusterTopology getClusterTopology( HazelcastInstance hazelcastInstance, Log log )
{
Set<Member> coreMembers = emptySet();
if ( hazelcastInstance != null )
{
coreMembers = hazelcastInstance.getCluster().getMembers();
}
return new ClusterTopology( canBeBootstrapped( coreMembers ), toCoreMemberMap( coreMembers, log ),
edgeMembers( hazelcastInstance, log ) );
}
private static class GetConnectedClients implements Callable<Collection<String>>, Serializable, HazelcastInstanceAware
{
private transient HazelcastInstance instance;
GetConnectedClients( HazelcastInstance instance )
{
this.instance = instance;
}
@Override
public Collection<String> call() throws Exception
{
final ClientService clientService = instance.getClientService();
return clientService.getConnectedClients()
.stream()
.map( Client::getUuid )
.collect( Collectors.toCollection( HashSet::new ) );
}
@Override
public void setHazelcastInstance( HazelcastInstance hazelcastInstance )
{
this.instance = hazelcastInstance;
}
}
private static Set<EdgeAddresses> edgeMembers( HazelcastInstance hazelcastInstance, Log log )
{
if ( hazelcastInstance == null )
{
log.info( "Cannot currently bind to distributed discovery service." );
return emptySet();
}
Collection<String> connectedUUIDs;
final IExecutorService executorService = hazelcastInstance.getExecutorService( "default" );
try
{
connectedUUIDs = executorService.submit( new GetConnectedClients( hazelcastInstance ) ).get();
}
catch ( InterruptedException | ExecutionException e )
{
log.info( "Unable to complete operation with distributed discovery service.", e );
return emptySet();
}
return hazelcastInstance.<String/*uuid*/, String/*boltAddress*/>getMap( EDGE_SERVER_BOLT_ADDRESS_MAP_NAME )
.entrySet().stream().
filter( entry -> connectedUUIDs.contains( entry.getKey() ) )
.map( entry -> new EdgeAddresses( new AdvertisedSocketAddress( entry.getValue() /*boltAddress*/ ) ) )
.collect( toSet() );
}
private static boolean canBeBootstrapped( Set<Member> coreMembers )
{
Iterator<Member> iterator = coreMembers.iterator();
return iterator.hasNext() && iterator.next().localMember();
}
static Map<MemberId, CoreAddresses> toCoreMemberMap( Set<Member> members, Log log )
{
Map<MemberId, CoreAddresses> coreMembers = new HashMap<>();
for ( Member member : members )
{
try
{
Pair<MemberId, CoreAddresses> pair = extractMemberAttributes( member );
coreMembers.put( pair.first(), pair.other() );
}
catch ( IllegalArgumentException e )
{
log.warn( "Incomplete member attributes supplied from Hazelcast", e );
}
}
return coreMembers;
}
static MemberAttributeConfig buildMemberAttributes( MemberId myself, Config config )
{
MemberAttributeConfig memberAttributeConfig = new MemberAttributeConfig();
memberAttributeConfig.setStringAttribute( MEMBER_UUID, myself.getUuid().toString() );
AdvertisedSocketAddress transactionSource = config.get( CoreEdgeClusterSettings
.transaction_advertised_address );
memberAttributeConfig.setStringAttribute( TRANSACTION_SERVER, transactionSource.toString() );
AdvertisedSocketAddress raftAddress = config.get( CoreEdgeClusterSettings.raft_advertised_address );
memberAttributeConfig.setStringAttribute( RAFT_SERVER, raftAddress.toString() );
AdvertisedSocketAddress boltAddress = EnterpriseEdgeEditionModule.extractBoltAddress( config );
memberAttributeConfig.setStringAttribute( BOLT_SERVER, boltAddress.toString() );
return memberAttributeConfig;
}
static Pair<MemberId, CoreAddresses> extractMemberAttributes( Member member )
{
MemberId memberId = new MemberId( UUID.fromString( member.getStringAttribute( MEMBER_UUID ) ) );
return Pair.of( memberId, new CoreAddresses(
new AdvertisedSocketAddress( member.getStringAttribute( RAFT_SERVER ) ),
new AdvertisedSocketAddress( member.getStringAttribute( TRANSACTION_SERVER ) ),
new AdvertisedSocketAddress( member.getStringAttribute( BOLT_SERVER ) )
) );
}
}