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GetServersProcedureForMultiDC.java
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GetServersProcedureForMultiDC.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.procedure;
import java.util.Map;
import org.neo4j.causalclustering.load_balancing.LoadBalancingProcessor;
import org.neo4j.causalclustering.load_balancing.LoadBalancingResult;
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.ProcedureSignature;
import static org.neo4j.causalclustering.load_balancing.procedure.ParameterNames.CONTEXT;
import static org.neo4j.causalclustering.load_balancing.procedure.ParameterNames.SERVERS;
import static org.neo4j.causalclustering.load_balancing.procedure.ParameterNames.TTL;
import static org.neo4j.causalclustering.load_balancing.procedure.ProcedureNames.GET_SERVERS_V2;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureSignature;
/**
* Returns endpoints and their capabilities.
*
* GetServersV2 extends upon V1 by allowing a client context consisting of
* key-value pairs to be supplied to and used by the concrete load
* balancing strategies.
*/
public class GetServersProcedureForMultiDC implements CallableProcedure
{
private final String DESCRIPTION = "Returns cluster endpoints and their capabilities.";
private final ProcedureSignature procedureSignature =
procedureSignature( GET_SERVERS_V2.fullyQualifiedProcedureName() )
.in( CONTEXT.parameterName(), Neo4jTypes.NTMap )
.out( TTL.parameterName(), Neo4jTypes.NTInteger )
.out( SERVERS.parameterName(), Neo4jTypes.NTMap )
.description( DESCRIPTION )
.build();
private final LoadBalancingProcessor loadBalancingProcessor;
public GetServersProcedureForMultiDC( LoadBalancingProcessor loadBalancingProcessor )
{
this.loadBalancingProcessor = loadBalancingProcessor;
}
@Override
public ProcedureSignature signature()
{
return procedureSignature;
}
@Override
public RawIterator<Object[],ProcedureException> apply( Context ctx, Object[] input ) throws ProcedureException
{
@SuppressWarnings( "unchecked" )
Map<String,String> clientContext = (Map<String,String>) input[0];
LoadBalancingProcessor.Result result = loadBalancingProcessor.run( clientContext );
return RawIterator.<Object[],ProcedureException>of( ResultFormatV1.build( new LoadBalancingResult(
result.routeEndpoints(),
result.writeEndpoints(),
result.readEndpoints(),
result.getTimeToLiveMillis() ) ) );
}
}