com.im.test.WebSocketFrameHandler.java Source code

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Here is the source code for com.im.test.WebSocketFrameHandler.java

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.im.test;

import io.netty.channel.Channel;
import java.util.Locale;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.util.concurrent.GlobalEventExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Echoes uppercase content of text frames.
 */
public class WebSocketFrameHandler extends SimpleChannelInboundHandler<WebSocketFrame> {

    private static final Logger logger = LoggerFactory.getLogger(WebSocketFrameHandler.class);
    public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
        // ping and pong frames already handled
        System.out.println(this);
        if (frame instanceof TextWebSocketFrame) {
            // Send the uppercase string back.
            String request = ((TextWebSocketFrame) frame).text();
            logger.info("{} received {}", ctx.channel(), request);
            Channel incoming = ctx.channel();
            ctx.channel().writeAndFlush(new TextWebSocketFrame(request.toUpperCase(Locale.US)));

            for (Channel channel : channels) {
                if (channel != incoming) {
                    channel.writeAndFlush(new TextWebSocketFrame("[" + incoming.remoteAddress() + "]" + request));
                } else {
                    channel.writeAndFlush(new TextWebSocketFrame("[you]" + request));
                }
            }
        } else {
            String message = "unsupported frame type: " + frame.getClass().getName();
            throw new UnsupportedOperationException(message);
        }
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception { // (2)
        Channel incoming = ctx.channel();
        // Broadcast a message to multiple Channels
        //      ctx.
        channels.writeAndFlush(new TextWebSocketFrame("[SERVER] - " + incoming.remoteAddress() + " "));
        channels.add(incoming);
        System.out.println("Client:" + incoming.remoteAddress() + "");
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { // (3)
        Channel incoming = ctx.channel();
        // Broadcast a message to multiple Channels
        channels.writeAndFlush(new TextWebSocketFrame("[SERVER] - " + incoming.remoteAddress() + " "));
        System.out.println("Client:" + incoming.remoteAddress() + "");

        // A closed Channel is automatically removed from ChannelGroup,
        // so there is no need to do "channels.remove(ctx.channel());"
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception { // (5)
        Channel incoming = ctx.channel();
        System.out.println("Client:" + incoming.remoteAddress() + "");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception { // (6)
        Channel incoming = ctx.channel();
        System.out.println("Client:" + incoming.remoteAddress() + "");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {// (7)
        Channel incoming = ctx.channel();
        System.out.println("Client:" + incoming.remoteAddress() + "");
        // 
        cause.printStackTrace();
        ctx.close();
    }
}