Java tutorial
/** * Copyright (c) 2014 Virtue Studios * * 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 org.virtue.network; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.virtue.network.protocol.message.HandshakeMessage; import org.virtue.network.session.Session; import org.virtue.network.session.impl.LoginSession; import org.virtue.network.session.impl.OnDemandSession; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandler; import io.netty.handler.timeout.ReadTimeoutException; import io.netty.util.AttributeKey; /** * @author Im Frizzy <skype:kfriz1998> * @since Aug 9, 2014 */ public class NetworkHandler implements ChannelInboundHandler { /** * The {@link Logger} Instance */ private static Logger logger = LoggerFactory.getLogger(NetworkHandler.class); /** * The Attachment {@link Session} for the network */ public static final AttributeKey<Session> attachment = AttributeKey.valueOf("NetworkHandler.attr"); /* (non-Javadoc) * @see io.netty.channel.ChannelHandler#handlerAdded(io.netty.channel.ChannelHandlerContext) */ @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { // TODO Auto-generated method stub } /* (non-Javadoc) * @see io.netty.channel.ChannelHandler#handlerRemoved(io.netty.channel.ChannelHandlerContext) */ @Override public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { // TODO Auto-generated method stub } /* (non-Javadoc) * @see io.netty.channel.ChannelHandler#exceptionCaught(io.netty.channel.ChannelHandlerContext, java.lang.Throwable) */ @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { if (cause instanceof ReadTimeoutException) { return; } logger.error("Exception caught in the network", cause); } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelRegistered(io.netty.channel.ChannelHandlerContext) */ @Override public void channelRegistered(ChannelHandlerContext ctx) throws Exception { logger.info("Channel is now registered from " + ctx.channel().remoteAddress()); } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelUnregistered(io.netty.channel.ChannelHandlerContext) */ @Override public void channelUnregistered(ChannelHandlerContext ctx) throws Exception { logger.info("Channel is now unregistered from " + ctx.channel().remoteAddress()); ctx.channel().close(); if (ctx.channel().attr(attachment).get() != null) { ((Session) ctx.channel().attr(attachment).get()).disconnect(); } } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelActive(io.netty.channel.ChannelHandlerContext) */ @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { //logger.info("Channel is now active from " + ctx.channel().remoteAddress()); } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelInactive(io.netty.channel.ChannelHandlerContext) */ @Override public void channelInactive(ChannelHandlerContext ctx) throws Exception { //logger.info("Channel is now inactive from " + ctx.channel().remoteAddress()); } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelRead(io.netty.channel.ChannelHandlerContext, java.lang.Object) */ @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { if (msg instanceof HandshakeMessage) { Object sessionAttachment = ctx.channel().attr(attachment).get(); HandshakeMessage handshakeMessage = (HandshakeMessage) msg; if (sessionAttachment == null) { switch (handshakeMessage.getType()) { case HANDSHAKE_ONDEMAND: ctx.channel().attr(attachment).set(new OnDemandSession(ctx.channel())); break; case HANDSHAKE_LOGIN: ctx.channel().attr(attachment).set(new LoginSession(ctx.channel())); break; case HANDHSHAKE_CREATION: //ctx.channel().attr(attachment).set(new CreationSession(ctx.channel())); break; case HANDSHAKE_SOCIAL_LOGIN: ctx.channel().attr(attachment).set(new LoginSession(ctx.channel())); break; default: throw new IllegalStateException("Invalid handshake state requested."); } } } if (ctx.channel().attr(attachment).get() != null) ((Session) ctx.channel().attr(attachment).get()).messageReceived(msg); } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelReadComplete(io.netty.channel.ChannelHandlerContext) */ @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { //ctx.flush(); } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#userEventTriggered(io.netty.channel.ChannelHandlerContext, java.lang.Object) */ @Override public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception { // TODO Auto-generated method stub } /* (non-Javadoc) * @see io.netty.channel.ChannelInboundHandler#channelWritabilityChanged(io.netty.channel.ChannelHandlerContext) */ @Override public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception { // TODO Auto-generated method stub } }