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ClusterOverviewProcedure.java
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ClusterOverviewProcedure.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.discovery.procedures;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.UUID;
import java.util.stream.Collectors;
import org.neo4j.causalclustering.discovery.ClientConnectorAddresses;
import org.neo4j.causalclustering.discovery.CoreServerInfo;
import org.neo4j.causalclustering.discovery.CoreTopology;
import org.neo4j.causalclustering.discovery.ReadReplicaInfo;
import org.neo4j.causalclustering.discovery.RoleInfo;
import org.neo4j.causalclustering.discovery.TopologyService;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.collection.RawIterator;
import org.neo4j.internal.kernel.api.exceptions.ProcedureException;
import org.neo4j.internal.kernel.api.procs.Neo4jTypes;
import org.neo4j.internal.kernel.api.procs.QualifiedName;
import org.neo4j.kernel.api.ResourceTracker;
import org.neo4j.kernel.api.proc.CallableProcedure;
import org.neo4j.kernel.api.proc.Context;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static java.util.Collections.emptyMap;
import static java.util.Comparator.comparing;
import static org.neo4j.helpers.collection.Iterables.asList;
import static org.neo4j.helpers.collection.Iterators.asRawIterator;
import static org.neo4j.helpers.collection.Iterators.map;
import static org.neo4j.internal.kernel.api.procs.ProcedureSignature.procedureSignature;
/**
* Overview procedure with added support for server groups.
*/
public class ClusterOverviewProcedure extends CallableProcedure.BasicProcedure
{
private static final String[] PROCEDURE_NAMESPACE = {"dbms", "cluster"};
public static final String PROCEDURE_NAME = "overview";
private final TopologyService topologyService;
private final Log log;
public ClusterOverviewProcedure( TopologyService topologyService, LogProvider logProvider )
{
super( procedureSignature( new QualifiedName( PROCEDURE_NAMESPACE, PROCEDURE_NAME ) )
.out( "id", Neo4jTypes.NTString )
.out( "addresses", Neo4jTypes.NTList( Neo4jTypes.NTString ) )
.out( "role", Neo4jTypes.NTString )
.out( "groups", Neo4jTypes.NTList( Neo4jTypes.NTString ) )
.out( "database", Neo4jTypes.NTString )
.description( "Overview of all currently accessible cluster members and their roles." )
.build() );
this.topologyService = topologyService;
this.log = logProvider.getLog( getClass() );
}
@Override
public RawIterator<Object[],ProcedureException> apply(
Context ctx, Object[] input, ResourceTracker resourceTracker )
{
Map<MemberId,RoleInfo> roleMap = topologyService.allCoreRoles();
List<ReadWriteEndPoint> endpoints = new ArrayList<>();
CoreTopology coreTopology = topologyService.allCoreServers();
Set<MemberId> coreMembers = coreTopology.members().keySet();
for ( MemberId memberId : coreMembers )
{
Optional<CoreServerInfo> coreServerInfo = coreTopology.find( memberId );
if ( coreServerInfo.isPresent() )
{
CoreServerInfo info = coreServerInfo.get();
RoleInfo role = roleMap.getOrDefault( memberId, RoleInfo.UNKNOWN );
endpoints.add( new ReadWriteEndPoint( info.connectors(), role, memberId.getUuid(),
asList( info.groups() ), info.getDatabaseName() ) );
}
else
{
log.debug( "No Address found for " + memberId );
}
}
for ( Map.Entry<MemberId,ReadReplicaInfo> readReplica : topologyService.allReadReplicas().members().entrySet() )
{
ReadReplicaInfo readReplicaInfo = readReplica.getValue();
endpoints.add( new ReadWriteEndPoint( readReplicaInfo.connectors(), RoleInfo.READ_REPLICA,
readReplica.getKey().getUuid(), asList( readReplicaInfo.groups() ), readReplicaInfo.getDatabaseName() ) );
}
endpoints.sort( comparing( o -> o.addresses().toString() ) );
return map( endpoint -> new Object[]
{
endpoint.memberId().toString(),
endpoint.addresses().uriList().stream().map( URI::toString ).collect( Collectors.toList() ),
endpoint.role().name(),
endpoint.groups(),
endpoint.dbName()
},
asRawIterator( endpoints.iterator() ) );
}
static class ReadWriteEndPoint
{
private final ClientConnectorAddresses clientConnectorAddresses;
private final RoleInfo role;
private final UUID memberId;
private final List<String> groups;
private final String dbName;
public ClientConnectorAddresses addresses()
{
return clientConnectorAddresses;
}
public RoleInfo role()
{
return role;
}
UUID memberId()
{
return memberId;
}
List<String> groups()
{
return groups;
}
String dbName()
{
return dbName;
}
ReadWriteEndPoint( ClientConnectorAddresses clientConnectorAddresses, RoleInfo role, UUID memberId, List<String> groups, String dbName )
{
this.clientConnectorAddresses = clientConnectorAddresses;
this.role = role;
this.memberId = memberId;
this.groups = groups;
this.dbName = dbName;
}
}
}