BootstrapClientWithOptionsAndAttrs.java

package com.manning.nettyinaction.chapter9;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.util.AttributeKey;

import java.net.InetSocketAddress;

/**
 * @author <a href="mailto:norman.maurer@googlemail.com">Norman Maurer</a>
 */
public class BootstrapClientWithOptionsAndAttrs {
    public void bootstrap() {
        final AttributeKey<Integer> id = new AttributeKey<Integer>("ID");

        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(new NioEventLoopGroup()).channel(NioSocketChannel.class)
                .handler(new SimpleChannelInboundHandler<ByteBuf>() {
                    @Override
                    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
                       Integer idValue = ctx.channel().attr(id).get();
                        // do something  with the idValue
                    }

                    @Override
                    protected void channelRead0(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf) throws Exception {
                        System.out.println("Reveived data");
                    }
                });
        bootstrap.option(ChannelOption.SO_KEEPALIVE, true).option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 5000);

        ChannelFuture future = bootstrap.connect(new InetSocketAddress("www.manning.com", 80));
        future.syncUninterruptibly();
    }
}