com.github.jaapterwoerds.jfall.chat.ChatServerHandler.java Source code

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Here is the source code for com.github.jaapterwoerds.jfall.chat.ChatServerHandler.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.github.jaapterwoerds.jfall.chat;

import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.ImmediateEventExecutor;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * This handler implements the behaviour of a simplified chat room. All currently active channels are added to a
 * {@link ChannelGroup} and incoming messages are broadcasted to all currently active channels.
 *
 * @author Jaap ter Woerds
 */
@Sharable
public class ChatServerHandler extends ChannelInboundHandlerAdapter {
    private static final Logger logger = Logger.getLogger(ChatServerHandler.class.getName());
    private final ChannelGroup group = new DefaultChannelGroup("Broadcast Group", ImmediateEventExecutor.INSTANCE);

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        group.flushAndWrite(msg);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        logger.log(Level.WARNING, "Unexpected exception from downstream.", cause);
        ctx.close();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        logger.log(Level.INFO, "Channel active:" + ctx.channel().remoteAddress());
        super.channelActive(ctx);
        this.group.add(ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        logger.log(Level.INFO, "Channel inactive:" + ctx.channel().remoteAddress());
        super.channelInactive(ctx);
        this.group.remove(ctx.channel());
    }
}