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ClusterOverviewProcedure.java
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ClusterOverviewProcedure.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.server.core;
import java.util.Set;
import java.util.UUID;
import java.util.stream.Stream;
import org.neo4j.collection.RawIterator;
import org.neo4j.coreedge.discovery.ClusterTopology;
import org.neo4j.coreedge.discovery.CoreTopologyService;
import org.neo4j.coreedge.raft.LeaderLocator;
import org.neo4j.coreedge.raft.NoLeaderFoundException;
import org.neo4j.coreedge.server.AdvertisedSocketAddress;
import org.neo4j.coreedge.server.CoreMember;
import org.neo4j.helpers.collection.Iterators;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.proc.CallableProcedure;
import org.neo4j.kernel.api.proc.Neo4jTypes;
import org.neo4j.kernel.api.proc.ProcedureSignature;
import static org.neo4j.coreedge.server.core.ClusterOverviewProcedure.ReadWriteEndPoint.follower;
import static org.neo4j.coreedge.server.core.ClusterOverviewProcedure.ReadWriteEndPoint.leader;
import static org.neo4j.helpers.collection.Iterators.asRawIterator;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureSignature;
public class ClusterOverviewProcedure extends CallableProcedure.BasicProcedure
{
public static final String NAME = "overview";
private final CoreTopologyService discoveryService;
private final LeaderLocator leaderLocator;
ClusterOverviewProcedure( CoreTopologyService discoveryService,
LeaderLocator leaderLocator)
{
super( procedureSignature( new ProcedureSignature.ProcedureName( new String[]{"dbms", "cluster"}, NAME ) )
.out( "id", Neo4jTypes.NTString )
.out( "address", Neo4jTypes.NTString )
.out( "role", Neo4jTypes.NTString ).build() );
this.discoveryService = discoveryService;
this.leaderLocator = leaderLocator;
}
@Override
public RawIterator<Object[], ProcedureException> apply( Context ctx, Object[] input ) throws ProcedureException
{
try
{
CoreMember leader = leaderLocator.getLeader();
ClusterTopology clusterTopology = discoveryService.currentTopology();
Set<CoreMember> coreMembers = clusterTopology.coreMembers();
Stream<ReadWriteEndPoint> leaderEndpoint = coreMembers.stream()
.filter( c -> c.equals( leader ) )
.map( c -> leader( clusterTopology.coreAddresses( c ).getBoltServer(), c.getUuid() ) );
Stream<ReadWriteEndPoint> followerEndpoints = coreMembers.stream()
.filter( c -> !c.equals( leader ) )
.map( c -> follower( clusterTopology.coreAddresses( c ).getBoltServer(), c.getUuid() ) );
Stream<ReadWriteEndPoint> readReplicaEndpoints = clusterTopology.edgeMembers().stream().map( m ->
ReadWriteEndPoint.readReplica( m.getBoltAddress() ) );
Stream<ReadWriteEndPoint> allTheEndpoints = Stream.concat( leaderEndpoint,
Stream.concat( followerEndpoints, readReplicaEndpoints ) );
return Iterators.map( ( l ) -> new Object[]{l.identifier(), l.address(), l.type()},
asRawIterator( allTheEndpoints.iterator() ) );
}
catch ( NoLeaderFoundException e )
{
throw new ProcedureException( Status.Cluster.NoLeader,
"No write server found. This can happen during a leader switch. " );
}
}
public enum Type
{
LEADER, FOLLOWER, READ_REPLICA
}
static class ReadWriteEndPoint
{
private final AdvertisedSocketAddress address;
private final Type type;
private final String identifier;
public String address()
{
return address.toString();
}
public String type()
{
return type.toString().toLowerCase();
}
String identifier()
{
return identifier ;
}
ReadWriteEndPoint(AdvertisedSocketAddress address, Type type, String identifier)
{
this.address = address;
this.type = type;
this.identifier = identifier;
}
public static ReadWriteEndPoint leader( AdvertisedSocketAddress address, UUID identifier )
{
return new ReadWriteEndPoint( address, Type.LEADER, identifier.toString() );
}
public static ReadWriteEndPoint follower( AdvertisedSocketAddress address, UUID identifier )
{
return new ReadWriteEndPoint( address, Type.FOLLOWER, identifier.toString() );
}
static ReadWriteEndPoint readReplica(AdvertisedSocketAddress address)
{
return new ReadWriteEndPoint( address, Type.READ_REPLICA, null );
}
}
}