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ResultFormatV1.java
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ResultFormatV1.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.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.stream.Stream;
import org.neo4j.causalclustering.load_balancing.Endpoint;
import org.neo4j.causalclustering.load_balancing.LoadBalancingResult;
import org.neo4j.causalclustering.load_balancing.Role;
import org.neo4j.helpers.AdvertisedSocketAddress;
import org.neo4j.helpers.SocketAddress;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.stream.Collectors.toList;
import static org.neo4j.causalclustering.load_balancing.Role.READ;
import static org.neo4j.causalclustering.load_balancing.Role.ROUTE;
import static org.neo4j.causalclustering.load_balancing.Role.WRITE;
/**
* The result format of GetServersV1 and GetServersV2 procedures.
*/
public class ResultFormatV1
{
private static final String ROLE_KEY = "role";
private static final String ADDRESSES_KEY = "addresses";
static Object[] build( LoadBalancingResult result )
{
Object[] routers = result.routeEndpoints().stream().map( Endpoint::address ).map( SocketAddress::toString ).toArray();
Object[] readers = result.readEndpoints().stream().map( Endpoint::address ).map( SocketAddress::toString ).toArray();
Object[] writers = result.writeEndpoints().stream().map( Endpoint::address ).map( SocketAddress::toString ).toArray();
List<Map<String,Object>> servers = new ArrayList<>();
if ( writers.length > 0 )
{
Map<String,Object> map = new TreeMap<>();
map.put( ROLE_KEY, WRITE.name() );
map.put( ADDRESSES_KEY, writers );
servers.add( map );
}
if ( readers.length > 0 )
{
Map<String,Object> map = new TreeMap<>();
map.put( ROLE_KEY, READ.name() );
map.put( ADDRESSES_KEY, readers );
servers.add( map );
}
if ( routers.length > 0 )
{
Map<String,Object> map = new TreeMap<>();
map.put( ROLE_KEY, ROUTE.name() );
map.put( ADDRESSES_KEY, routers );
servers.add( map );
}
long timeToLiveSeconds = MILLISECONDS.toSeconds( result.getTimeToLiveMillis() );
return new Object[]{timeToLiveSeconds, servers};
}
public static LoadBalancingResult parse( Object[] record )
{
long timeToLiveSeconds = (long) record[0];
@SuppressWarnings( "unchecked" )
List<Map<String,Object>> endpointData = (List<Map<String,Object>>) record[1];
Map<Role,List<Endpoint>> endpoints = parse( endpointData );
return new LoadBalancingResult(
endpoints.get( ROUTE ),
endpoints.get( WRITE ),
endpoints.get( READ ),
timeToLiveSeconds * 1000 );
}
public static LoadBalancingResult parse( Map<String,Object> record )
{
return parse( new Object[]{
record.get( ParameterNames.TTL.parameterName() ),
record.get( ParameterNames.SERVERS.parameterName() )
} );
}
private static Map<Role,List<Endpoint>> parse( List<Map<String,Object>> result )
{
Map<Role,List<Endpoint>> endpoints = new HashMap<>();
for ( Map<String,Object> single : result )
{
Role role = Role.valueOf( (String) single.get( "role" ) );
List<Endpoint> addresses = parse( (Object[]) single.get( "addresses" ), role );
endpoints.put( role, addresses );
}
Arrays.stream( Role.values() ).forEach( r -> endpoints.putIfAbsent( r, Collections.emptyList() ) );
return endpoints;
}
private static List<Endpoint> parse( Object[] addresses, Role role )
{
return Stream.of( addresses )
.map( rawAddress -> parse( (String) rawAddress ) )
.map( address -> new Endpoint( address, role ) )
.collect( toList() );
}
private static AdvertisedSocketAddress parse( String address )
{
String[] split = address.split( ":" );
return new AdvertisedSocketAddress( split[0], Integer.valueOf( split[1] ) );
}
}