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ReadReplicaTopology.java
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ReadReplicaTopology.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* 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.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.discovery;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ThreadLocalRandom;
import org.neo4j.causalclustering.identity.MemberId;
import static java.util.Collections.emptyMap;
public class ReadReplicaTopology implements Topology<ReadReplicaInfo>
{
static final ReadReplicaTopology EMPTY = new ReadReplicaTopology( emptyMap() );
private final Map<MemberId,ReadReplicaInfo> readReplicaMembers;
public ReadReplicaTopology( Map<MemberId,ReadReplicaInfo> readReplicaMembers )
{
this.readReplicaMembers = readReplicaMembers;
}
public Collection<ReadReplicaInfo> allMemberInfo()
{
return readReplicaMembers.values();
}
@Override
public Map<MemberId, ReadReplicaInfo> members()
{
return readReplicaMembers;
}
@Override
public String toString()
{
return String.format( "{readReplicas=%s}", readReplicaMembers );
}
public Optional<MemberId> randomReadReplicaMemberId()
{
if ( readReplicaMembers.isEmpty() )
{
return Optional.empty();
}
return readReplicaMembers.keySet().stream().skip( ThreadLocalRandom.current().nextInt( readReplicaMembers.size() ) ).findFirst();
}
@Override
public ReadReplicaTopology filterTopologyByDb( String dbName )
{
Map<MemberId, ReadReplicaInfo> filteredMembers = filterHostsByDb( members(), dbName );
return new ReadReplicaTopology( filteredMembers );
}
}