LogEventEncoder.java

package com.yichao.woo.netty.in.action.ch13;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.MessageToMessageEncoder;

import java.net.InetSocketAddress;
import java.util.List;

import static io.netty.util.CharsetUtil.UTF_8;

/**
 * Created by Yichao-Woo.
 */
public class LogEventEncoder extends MessageToMessageEncoder<LogEvent> {
    private final InetSocketAddress remoteAddress;

    public LogEventEncoder(InetSocketAddress remoteAddress) {
        this.remoteAddress = remoteAddress;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, LogEvent msg, List<Object> out) throws Exception {
        ByteBuf buf = ctx.alloc().buffer();
        buf.writeBytes(msg.getLogfile().getBytes(UTF_8));
        buf.writeByte(LogEvent.SEPARATOR);
        buf.writeBytes(msg.getMsg().getBytes(UTF_8));
        out.add(new DatagramPacket(buf, remoteAddress));
    }
}