Java tutorial
/* * This file is part of Flow Networking Example, licensed under the MIT License (MIT). * * Copyright (c) 2014 Spout LLC <https://spout.org/> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.flowpowered.examples.networking; import com.flowpowered.examples.networking.message.TestMessage; import com.flowpowered.examples.networking.message.TestMessageCodec; import com.flowpowered.examples.networking.message.TestMessageHandler; import com.flowpowered.networking.Codec; import com.flowpowered.networking.Message; import com.flowpowered.networking.MessageHandler; import com.flowpowered.networking.exception.IllegalOpcodeException; import com.flowpowered.networking.exception.UnknownPacketException; import com.flowpowered.networking.protocol.simple.SimpleProtocol; import io.netty.buffer.ByteBuf; public class TestSecondProtocol extends SimpleProtocol { public TestSecondProtocol() { super("TestProtocol2", 1); registerMessage(TestMessage.class, TestMessageCodec.class, TestMessageHandler.class, null); } @Override public Codec<?> readHeader(ByteBuf buf) throws UnknownPacketException { int id = buf.readUnsignedShort(); int length = buf.readInt(); try { return getCodecLookupService().find(id); } catch (IllegalOpcodeException e) { throw new UnknownPacketException("Packet not found!", id, length); } } @Override public ByteBuf writeHeader(ByteBuf header, Codec.CodecRegistration codec, ByteBuf data) { header.writeShort(codec.getOpcode()); header.writeInt(data.writerIndex()); return header; } @Override public <M extends Message> MessageHandler<?, M> getMessageHandle(Class<M> message) { MessageHandler<?, M> handle = super.getMessageHandle(message); if (handle == null) { System.out.println("Null handle"); System.out.println(message); System.out.println(getHandlerLookupService()); } return handle; } }