TcpSlaveClientComm.java

/*
 * Galaxy
 * Copyright (c) 2012-2014, Parallel Universe Software Co. All rights reserved.
 * 
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *  
 *   or (per the licensee's choosing)
 *  
 * under the terms of the GNU Lesser General Public License version 3.0
 * as published by the Free Software Foundation.
 */
package co.paralleluniverse.galaxy.netty;

import co.paralleluniverse.galaxy.Cluster;
import co.paralleluniverse.galaxy.cluster.NodeInfo;
import co.paralleluniverse.galaxy.cluster.ReaderWriters;
import co.paralleluniverse.galaxy.cluster.SlaveConfigurationListener;
import co.paralleluniverse.galaxy.core.Backup;
import co.paralleluniverse.galaxy.core.Message;
import static co.paralleluniverse.galaxy.netty.IpConstants.*;
import java.beans.ConstructorProperties;
import java.net.InetAddress;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author pron
 */
class TcpSlaveClientComm extends AbstractTcpClient {

    private static final Logger LOG = LoggerFactory.getLogger(TcpSlaveClientComm.class);
    private Backup backup;

    @ConstructorProperties({"name", "cluster"})
    public TcpSlaveClientComm(String name, Cluster cluster) throws Exception {
        super(name, cluster, IP_SLAVE_PORT);

        cluster.addNodeProperty(IP_ADDRESS, true, true, INET_ADDRESS_READER_WRITER);
        cluster.setNodeProperty(IP_ADDRESS, InetAddress.getLocalHost());
        cluster.addNodeProperty(IP_SLAVE_PORT, true, false, ReaderWriters.INTEGER);

        cluster.addSlaveConfigurationListener(scListener);
    }

    private final SlaveConfigurationListener scListener = new SlaveConfigurationListener() {

        @Override
        public void newMaster(NodeInfo node) {
            if (!node.equals(getCluster().getMyNodeInfo())) {
                LOG.info("New master ({})! Reconnecting.", node.getName());
                reconnect(node.getName());
            } else
                LOG.debug("It appears I'm the new master, and switchToMaster should come soo. Not connecting to myself");
        }

        @Override
        public void slaveAdded(NodeInfo node) {
        }

        @Override
        public void slaveRemoved(NodeInfo node) {
        }

    };

//    @Override
//    protected ChannelPipeline getPipeline() throws Exception {
//        final ChannelPipeline pipeline = super.getPipeline();
//        pipeline.addLast("diconnect", new SimpleChannelUpstreamHandler() {
//            @Override
//            public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
//                super.channelDisconnected(ctx, e);
//                LOG.info("Channel disconnected. Removing as slave candidate.");
//                getCluster().goOffline();
//            }
//        });
//        return pipeline;
//    }
    @Override
    protected void postInit() throws Exception {
        super.postInit();
    }

    @Override
    protected void init() throws Exception {
        super.init();
    }

    @Override
    protected void available(boolean value) {
        super.available(value);
    }

    @Override
    public void joinedCluster() {
        super.joinedCluster();

        final NodeInfo master = getCluster().getMaster(getCluster().getMyNodeId());
        if (master != null) {
            LOG.info("Connecting to master node {}", master.getName());
            reconnect(master.getName());
        }
    }

    @Override
    protected void start(boolean master) {
        if (master) {
            LOG.info("Master node. Shutting down slave client.");
            shutdown();
            return;
        }

        final String myMaster = getCluster().getMyMaster().getName();
        assert myMaster != null;

        if (!myMaster.equals(getNodeName())) {
            LOG.info("Re-connecting to master node {}", myMaster);
            reconnect(myMaster);
        }
    }

    @Override
    public void shutdown() {
        getCluster().removeSlaveConfigurationListener(scListener);

        super.shutdown();
    }

    @Override
    public void switchToMaster() {
        super.switchToMaster();
        LOG.info("Switched to master. Shutting down slave client.");
        shutdown();
    }

    public void setBackup(Backup backup) {
        assertDuringInitialization();
        this.backup = backup;
    }

    @Override
    protected void receive(ChannelHandlerContext ctx, Message message) {
        backup.receive(message);
    }

}