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ReadReplicaTopology.java
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ReadReplicaTopology.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.discovery;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;
import org.neo4j.causalclustering.identity.MemberId;
import static java.util.Collections.emptyMap;
public class ReadReplicaTopology
{
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();
}
public Map<MemberId,ReadReplicaInfo> replicaMembers()
{
return readReplicaMembers;
}
Optional<ReadReplicaInfo> find( MemberId memberId )
{
return Optional.ofNullable( readReplicaMembers.get( memberId ) );
}
@Override
public String toString()
{
return String.format( "{readReplicas=%s}", readReplicaMembers );
}
public Optional<MemberId> anyReadReplicaMemberId()
{
if ( readReplicaMembers.keySet().size() == 0 )
{
return Optional.empty();
}
else
{
return readReplicaMembers.keySet().stream().findAny();
}
}
}