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ClusterOverviewProcedure.java
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ClusterOverviewProcedure.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.discovery.procedures;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import org.neo4j.causalclustering.core.consensus.LeaderLocator;
import org.neo4j.causalclustering.core.consensus.NoLeaderFoundException;
import org.neo4j.causalclustering.discovery.ClientConnectorAddresses;
import org.neo4j.causalclustering.discovery.CoreAddresses;
import org.neo4j.causalclustering.discovery.CoreTopology;
import org.neo4j.causalclustering.discovery.CoreTopologyService;
import org.neo4j.causalclustering.discovery.ReadReplicaAddresses;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.collection.RawIterator;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.proc.CallableProcedure;
import org.neo4j.kernel.api.proc.Context;
import org.neo4j.kernel.api.proc.Neo4jTypes;
import org.neo4j.kernel.api.proc.QualifiedName;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static org.neo4j.helpers.collection.Iterators.asRawIterator;
import static org.neo4j.helpers.collection.Iterators.map;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureSignature;
public class ClusterOverviewProcedure extends CallableProcedure.BasicProcedure
{
private static final String[] PROCEDURE_NAMESPACE = {"dbms", "cluster"};
public static final String PROCEDURE_NAME = "overview";
private final CoreTopologyService discoveryService;
private final LeaderLocator leaderLocator;
private final Log log;
public ClusterOverviewProcedure( CoreTopologyService discoveryService,
LeaderLocator leaderLocator, LogProvider logProvider )
{
super( procedureSignature( new QualifiedName( PROCEDURE_NAMESPACE, PROCEDURE_NAME ) )
.out( "id", Neo4jTypes.NTString ).out( "addresses", Neo4jTypes.NTList( Neo4jTypes.NTString ) )
.out( "role", Neo4jTypes.NTString )
.description( "Overview of all currently accessible cluster members and their roles." )
.build() );
this.discoveryService = discoveryService;
this.leaderLocator = leaderLocator;
this.log = logProvider.getLog( getClass() );
}
@Override
public RawIterator<Object[],ProcedureException> apply( Context ctx, Object[] input ) throws ProcedureException
{
List<ReadWriteEndPoint> endpoints = new ArrayList<>();
CoreTopology coreTopology = discoveryService.coreServers();
Set<MemberId> coreMembers = coreTopology.members();
MemberId leader = null;
try
{
leader = leaderLocator.getLeader();
}
catch ( NoLeaderFoundException e )
{
log.debug( "No write server found. This can happen during a leader switch." );
}
for ( MemberId memberId : coreMembers )
{
Optional<ClientConnectorAddresses> clientConnectorAddresses =
coreTopology.find( memberId ).map( CoreAddresses::connectors );
if ( clientConnectorAddresses.isPresent() )
{
Role role = memberId.equals( leader ) ? Role.LEADER : Role.FOLLOWER;
endpoints.add( new ReadWriteEndPoint( clientConnectorAddresses.get(), role, memberId.getUuid() ) );
}
else
{
log.debug( "No Address found for " + memberId );
}
}
for ( ReadReplicaAddresses readReplicaAddresses : discoveryService.readReplicas().members() )
{
endpoints.add( new ReadWriteEndPoint( readReplicaAddresses.connectors(), Role.READ_REPLICA ) );
}
Collections.sort( endpoints, ( o1, o2 ) -> o1.addresses().toString().compareTo( o2.addresses().toString() ) );
return map( ( l ) -> new Object[]{l.identifier().toString(), l.addresses().uriList().stream().map( URI::toString ).toArray(), l.role().name()},
asRawIterator( endpoints.iterator() ) );
}
private static class ReadWriteEndPoint
{
private static final UUID ZERO_ID = new UUID( 0, 0 );
private final ClientConnectorAddresses clientConnectorAddresses;
private final Role role;
private final UUID identifier;
public ClientConnectorAddresses addresses()
{
return clientConnectorAddresses;
}
public Role role()
{
return role;
}
UUID identifier()
{
return identifier == null ? ZERO_ID : identifier;
}
ReadWriteEndPoint( ClientConnectorAddresses clientConnectorAddresses, Role role )
{
this( clientConnectorAddresses, role, null );
}
ReadWriteEndPoint( ClientConnectorAddresses clientConnectorAddresses, Role role, UUID identifier )
{
this.clientConnectorAddresses = clientConnectorAddresses;
this.role = role;
this.identifier = identifier;
}
}
}