92efa3c916
Motivation: Uptime example is lack of server. UptimeClient's code style is a little bit different from others, which make reader feel confused. We don't need to create a new Bootstrap instance each time client reconnect to server. Modification: Add UptimeServer and UptimeServerHandler which simply accept all connection and discard all message. Change UptimeClient's code style. Share a single Bootstrap instance. Result: Uptime server support. Consistent code style. Single Bootstrap for all reconnection.
72 lines
2.8 KiB
Java
72 lines
2.8 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.uptime;
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import io.netty.bootstrap.Bootstrap;
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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.ChannelInitializer;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.SocketChannel;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import io.netty.handler.timeout.IdleStateHandler;
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/**
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* Connects to a server periodically to measure and print the uptime of the
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* server. This example demonstrates how to implement reliable reconnection
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* mechanism in Netty.
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*/
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public final class UptimeClient {
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static final String HOST = System.getProperty("host", "127.0.0.1");
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static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
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// Sleep 5 seconds before a reconnection attempt.
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static final int RECONNECT_DELAY = Integer.parseInt(System.getProperty("reconnectDelay", "5"));
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// Reconnect when the server sends nothing for 10 seconds.
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private static final int READ_TIMEOUT = Integer.parseInt(System.getProperty("readTimeout", "10"));
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private static final UptimeClientHandler handler = new UptimeClientHandler();
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private static final Bootstrap bs = new Bootstrap();
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public static void main(String[] args) throws Exception {
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EventLoopGroup group = new NioEventLoopGroup();
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bs.group(group)
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.channel(NioSocketChannel.class)
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.remoteAddress(HOST, PORT)
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.handler(new ChannelInitializer<SocketChannel>() {
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@Override
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protected void initChannel(SocketChannel ch) throws Exception {
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ch.pipeline().addLast(new IdleStateHandler(READ_TIMEOUT, 0, 0), handler);
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}
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});
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bs.connect();
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}
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static void connect() {
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bs.connect().addListener(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture future) throws Exception {
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if (future.cause() != null) {
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handler.startTime = -1;
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handler.println("Failed to connect: " + future.cause());
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}
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}
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});
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}
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}
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