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SupportedProtocolCreator.java
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SupportedProtocolCreator.java
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/*
* Copyright (c) 2002-2018 "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.core;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.neo4j.causalclustering.protocol.Protocol;
import org.neo4j.causalclustering.protocol.handshake.ApplicationSupportedProtocols;
import org.neo4j.causalclustering.protocol.handshake.ModifierSupportedProtocols;
import org.neo4j.graphdb.config.Setting;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.stream.Streams;
public class SupportedProtocolCreator
{
private final Config config;
public SupportedProtocolCreator( Config config )
{
this.config = config;
}
public ApplicationSupportedProtocols createSupportedRaftProtocol()
{
List<Integer> raftVersions = config.get( CausalClusteringSettings.raft_versions );
return new ApplicationSupportedProtocols( Protocol.ApplicationProtocolCategory.RAFT, raftVersions );
}
public List<ModifierSupportedProtocols> createSupportedModifierProtocols()
{
ModifierSupportedProtocols supportedCompression = compressionProtocolVersions();
return Stream.of( supportedCompression )
.filter( supportedProtocols -> !supportedProtocols.versions().isEmpty() )
.collect( Collectors.toList() );
}
private ModifierSupportedProtocols compressionProtocolVersions()
{
return modifierProtocolVersions( CausalClusteringSettings.compression_versions, Protocol.ModifierProtocolCategory.COMPRESSION );
}
private ModifierSupportedProtocols modifierProtocolVersions(
Setting<List<String>> compressionVersions, Protocol.ModifierProtocolCategory identifier )
{
List<String> compressionAlgorithms = config.get( compressionVersions );
List<String> versions = compressionAlgorithms.stream()
.map( Protocol.ModifierProtocols::fromFriendlyName )
.flatMap( Streams::ofOptional )
.filter( protocol -> Objects.equals( protocol.category(), identifier.canonicalName() ) )
.map( Protocol.ModifierProtocols::implementation )
.collect( Collectors.toList() );
return new ModifierSupportedProtocols( identifier, versions );
}
}