package com.tesora.dve.parlb;

/*
 * #%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.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

public class LoadBalancerServerHandler extends ChannelInboundHandlerAdapter {

	private final Channel inboundChannel;

	public LoadBalancerServerHandler(Channel inboundChannel) {
		this.inboundChannel = inboundChannel;
	}

   @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.read();
        ctx.write(Unpooled.EMPTY_BUFFER);
    }

	@Override
	public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception {
		inboundChannel.writeAndFlush(msg).addListener(new ChannelFutureListener() {
			@Override
			public void operationComplete(ChannelFuture future) throws Exception {
				if (future.isSuccess()) {
					ctx.channel().read();
				} else {
					future.channel().close();
				}
			}
		});
	}

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        MysqlClientHandler.closeOnFlush(inboundChannel);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        MysqlClientHandler.closeOnFlush(ctx.channel());
    }

}