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UpstreamDatabaseSelectionStrategy.java
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UpstreamDatabaseSelectionStrategy.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.readreplica;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import org.neo4j.causalclustering.discovery.TopologyService;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.helpers.Service;
import org.neo4j.kernel.configuration.Config;
public abstract class UpstreamDatabaseSelectionStrategy extends Service
{
protected TopologyService topologyService;
protected Config config;
protected MemberId myself;
public UpstreamDatabaseSelectionStrategy( String key, String... altKeys )
{
super( key, altKeys );
}
// Service loaded can't inject this via the constructor
void inject( TopologyService topologyService, Config config, MemberId myself )
{
this.topologyService = topologyService;
this.config = config;
this.myself = myself;
init();
}
void init() {}
public abstract Optional<MemberId> upstreamDatabase() throws UpstreamDatabaseSelectionException;
@Override
public String toString()
{
return nicelyCommaSeparatedList( getKeys() );
}
private static String nicelyCommaSeparatedList( Iterable<String> keys )
{
return StreamSupport.stream( keys.spliterator(), false )
.collect( Collectors.joining( ", " ) );
}
}