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Library implementing Paxos and Heartbeat components required for High Availability Neo4j

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/*
 * Copyright (c) 2018-2020 "Graph Foundation"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * Copyright (c) 2002-2018 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of ONgDB 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) 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.
 */
package org.neo4j.cluster.protocol.heartbeat;

import java.net.URI;
import java.net.URISyntaxException;

import org.neo4j.cluster.InstanceId;
import org.neo4j.cluster.com.message.Message;
import org.neo4j.cluster.com.message.MessageHolder;
import org.neo4j.cluster.com.message.MessageProcessor;
import org.neo4j.cluster.com.message.MessageType;
import org.neo4j.cluster.protocol.cluster.ClusterContext;

/**
 * When a message is sent out, reset the timeout for sending heartbeat to the HEADER_TO host, since we only have to send i_am_alive if
 * nothing else is going on.
 */
public class HeartbeatRefreshProcessor implements MessageProcessor
{
    private final MessageHolder outgoing;
    private final ClusterContext clusterContext;

    public HeartbeatRefreshProcessor( MessageHolder outgoing, ClusterContext clusterContext )
    {
        this.outgoing = outgoing;
        this.clusterContext = clusterContext;
    }

    @Override
    public boolean process( Message message )
    {
        if ( !message.isInternal() &&
                !message.getMessageType().equals( HeartbeatMessage.i_am_alive ) )
        {
            try
            {
                String to = message.getHeader( Message.HEADER_TO );

                InstanceId serverId = clusterContext.getConfiguration().getIdForUri( new URI( to ) );

                if ( !clusterContext.isMe( serverId ) )
                {
                    outgoing.offer( Message.internal( HeartbeatMessage.reset_send_heartbeat,
                            serverId ) );
                }
            }
            catch ( URISyntaxException e )
            {
                e.printStackTrace();
            }
        }
        return true;
    }
}