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MajorityIncludingSelfQuorum.java
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MajorityIncludingSelfQuorum.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.core.consensus;
import java.util.Collection;
public class MajorityIncludingSelfQuorum
{
private static final int MIN_QUORUM = 2;
public static boolean isQuorum( Collection<?> cluster, Collection<?> countNotIncludingMyself )
{
return isQuorum( cluster.size(), countNotIncludingMyself.size() );
}
public static boolean isQuorum( int clusterSize, int countNotIncludingSelf )
{
return isQuorum( MIN_QUORUM, clusterSize, countNotIncludingSelf );
}
public static boolean isQuorum( int minQuorum, int clusterSize, int countNotIncludingSelf )
{
return (countNotIncludingSelf + 1) >= minQuorum &&
countNotIncludingSelf >= clusterSize / 2;
}
}