com.chuck.netty4.websocket.WebSocketFrameHandler.java Source code

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Here is the source code for com.chuck.netty4.websocket.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.chuck.netty4.websocket;

import java.util.Locale;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
        // ping and pong frames already handled
        if (frame instanceof TextWebSocketFrame) {
            // Send the uppercase string back.
            String request = ((TextWebSocketFrame) frame).text();
            logger.info("{} received {}", ctx.channel(), request);
            // ctx.channel().writeAndFlush(
            // new TextWebSocketFrame(request.toUpperCase(Locale.US)));
            Global.group.writeAndFlush(new TextWebSocketFrame(request.toUpperCase(Locale.US)));
        } else {
            String message = "unsupported frame type: " + frame.getClass().getName();
            throw new UnsupportedOperationException(message);
        }
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        try {
            Global.group.writeAndFlush(new TextWebSocketFrame(ctx.channel() + ""));
            Global.group.remove(ctx.channel());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("");
        try {
            Global.group.add(ctx.channel());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}