MgcpMessageEncoder.java

/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2017, Telestax Inc and individual contributors
 * by the @authors tag. 
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.restcomm.media.control.mgcp.network.netty;

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

import org.apache.log4j.Logger;
import org.restcomm.media.control.mgcp.message.MgcpMessage;

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

/**
 * Encodes an MGCP message into a {@link DatagramPacket} ready to be sent to remote peer over the network.
 * 
 * @author Henrique Rosa (henrique.rosa@telestax.com)
 *
 */
public class MgcpMessageEncoder extends MessageToMessageEncoder<DefaultAddressedEnvelope<MgcpMessage, SocketAddress>> {

    private static final Logger log = Logger.getLogger(MgcpMessageEncoder.class);

    public static final String PIPELINE_KEY = "mgcp-encoder";

    @Override
    protected void encode(ChannelHandlerContext ctx, DefaultAddressedEnvelope<MgcpMessage, SocketAddress> msg, List<Object> out)
            throws Exception {
        final InetSocketAddress sender = (InetSocketAddress) msg.sender();
        final InetSocketAddress recipient = (InetSocketAddress) msg.recipient();
        final byte[] content = msg.content().toString().getBytes();
        final ByteBuf buffer = Unpooled.buffer(content.length).writeBytes(content);
        final DatagramPacket packet = new DatagramPacket(buffer, recipient, sender);

        if (log.isDebugEnabled()) {
            log.debug("Sending outgoing message to " + recipient.getHostString() + "\n" + msg.toString());
        }

        out.add(packet);
    }

}