org.l2junity.network.codecs.PacketEncoder.java Source code

Introduction

Here is the source code for org.l2junity.network.codecs.PacketEncoder.java

Source

/*
 * Copyright (C) 2004-2014 L2J Unity
 * 
 * This file is part of L2J Unity.
 * 
 * L2J Unity is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * L2J Unity 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.l2junity.network.codecs;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

import java.nio.ByteOrder;

import org.l2junity.network.IOutgoingPacket;
import org.l2junity.network.PacketWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Nos
 */
@Sharable
public class PacketEncoder extends MessageToByteEncoder<IOutgoingPacket> {
    private static final Logger LOGGER = LoggerFactory.getLogger(PacketEncoder.class);

    private final ByteOrder _byteOrder;
    private final int _maxPacketSize;

    public PacketEncoder(ByteOrder byteOrder, int maxPacketSize) {
        super();
        _byteOrder = byteOrder;
        _maxPacketSize = maxPacketSize;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, IOutgoingPacket packet, ByteBuf out) {
        if (out.order() != _byteOrder) {
            out = out.order(_byteOrder);
        }

        try {
            if (packet.write(new PacketWriter(out))) {
                if (out.writerIndex() > _maxPacketSize) {
                    throw new IllegalStateException("Packet (" + packet + ") size (" + out.writerIndex()
                            + ") is bigger than the limit (" + _maxPacketSize + ")");
                }
            } else {
                // Avoid sending the packet
                out.clear();
            }
        } catch (Throwable e) {
            LOGGER.warn("Failed sending Packet({})", packet, e);
            // Avoid sending the packet if some exception happened
            out.clear();
        }
    }
}