b57d9f307f
- write() now accepts a ChannelPromise and returns ChannelFuture as most users expected. It makes the user's life much easier because it is now much easier to get notified when a specific message has been written. - flush() does not create a ChannelPromise nor returns ChannelFuture. It is now similar to what read() looks like.
79 lines
2.7 KiB
Java
79 lines
2.7 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.telnet;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import java.net.InetAddress;
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import java.util.Date;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* Handles a server-side channel.
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*/
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@Sharable
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public class TelnetServerHandler extends SimpleChannelInboundHandler<String> {
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private static final Logger logger = Logger.getLogger(TelnetServerHandler.class.getName());
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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// Send greeting for a new connection.
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ctx.write(
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"Welcome to " + InetAddress.getLocalHost().getHostName() + "!\r\n");
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ctx.write("It is " + new Date() + " now.\r\n");
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}
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@Override
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public void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
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// Generate and write a response.
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String response;
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boolean close = false;
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if (request.isEmpty()) {
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response = "Please type something.\r\n";
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} else if ("bye".equals(request.toLowerCase())) {
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response = "Have a good day!\r\n";
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close = true;
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} else {
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response = "Did you say '" + request + "'?\r\n";
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}
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// We do not need to write a ChannelBuffer here.
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// We know the encoder inserted at TelnetPipelineFactory will do the conversion.
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ChannelFuture future = ctx.writeAndFlush(response);
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// Close the connection after sending 'Have a good day!'
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// if the client has sent 'bye'.
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if (close) {
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future.addListener(ChannelFutureListener.CLOSE);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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logger.log(
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Level.WARNING,
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"Unexpected exception from downstream.", cause);
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ctx.close();
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}
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}
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