com.tesora.dve.standalone.LoadBalancer.java Source code

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Here is the source code for com.tesora.dve.standalone.LoadBalancer.java

Source

package com.tesora.dve.standalone;

/*
 * #%L
 * Tesora Inc.
 * Database Virtualization Engine
 * %%
 * Copyright (C) 2011 - 2014 Tesora Inc.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 * 
 * 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/>.
 * #L%
 */

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.concurrent.DefaultThreadFactory;
import io.netty.util.internal.logging.InternalLoggerFactory;
import io.netty.util.internal.logging.Log4JLoggerFactory;

import java.util.Properties;

import org.apache.log4j.Logger;

import com.tesora.dve.common.PEConstants;
import com.tesora.dve.common.PEFileUtils;
import com.tesora.dve.parlb.LoadBalancerProxyInitializer;

public class LoadBalancer {

    private static Logger logger = Logger.getLogger(LoadBalancer.class);

    private static final String PORT_PROPERTY = "loadbalancer.port";

    private LoadBalancerProxyInitializer proxyInitializer;
    private int lbPort;

    public LoadBalancer(Properties props) throws Exception {
        proxyInitializer = new LoadBalancerProxyInitializer(props);

        lbPort = props.contains(PORT_PROPERTY) ? Integer.parseInt(props.getProperty(PORT_PROPERTY))
                : proxyInitializer.getDefaultPort();

        logger.info("Starting Tesora DVE load balancer using:");
        logger.info("... balancer port : " + lbPort);
    }

    public void run() throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup(0, new DefaultThreadFactory("lb-boss"));
        EventLoopGroup workerGroup = new NioEventLoopGroup(0, new DefaultThreadFactory("lb-worker"));

        ServerBootstrap b = new ServerBootstrap();

        try {
            b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(proxyInitializer)
                    .childOption(ChannelOption.AUTO_READ, false).bind(lbPort).sync().channel().closeFuture().sync();
        } catch (Throwable e) {
            throw new Exception("Failed to start load balancer on port " + lbPort, e);
        } finally {
            //         b.shutdown();
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
            proxyInitializer.close();
        }
    }

    public static void main(String[] args) throws Exception {

        Properties props = PEFileUtils.loadPropertiesFile(LoadBalancer.class, PEConstants.CONFIG_FILE_NAME);

        if (args.length == 2 && "-port".equalsIgnoreCase(args[0]))
            props.setProperty(PORT_PROPERTY, args[1]);
        else if (args.length > 0)
            throw new Exception("Usage: LoadBalancer [-port <port>]");

        InternalLoggerFactory.setDefaultFactory(new Log4JLoggerFactory());
        LoadBalancer loadBalancer = new LoadBalancer(props);
        loadBalancer.run();
    }
}