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SupportedProtocols.java
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SupportedProtocols.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.protocol.handshake;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.neo4j.causalclustering.protocol.Protocol;
/**
* Keeps track of protocols which are supported by this instance. This is later used when
* matching for mutually supported versions during a protocol negotiation.
*
* @param <U> Comparable version type.
* @param <T> Protocol type.
*/
public abstract class SupportedProtocols<U extends Comparable<U>,T extends Protocol<U>>
{
private final Protocol.Category<T> category;
private final List<U> versions;
/**
* @param category The protocol category.
* @param versions List of supported versions. An empty list means that every version is supported.
*/
SupportedProtocols( Protocol.Category<T> category, List<U> versions )
{
this.category = category;
this.versions = Collections.unmodifiableList( versions );
}
public Set<U> mutuallySupportedVersionsFor( Set<U> requestedVersions )
{
if ( versions().isEmpty() )
{
return requestedVersions;
}
else
{
return requestedVersions.stream().filter( versions()::contains ).collect( Collectors.toSet() );
}
}
public Protocol.Category<T> identifier()
{
return category;
}
/**
* @return If an empty list then all versions of a matching protocol will be supported
*/
public List<U> versions()
{
return versions;
}
}