com.alibaba.rocketmq.shade.io.netty.example.uptime.UptimeClient Maven / Gradle / Ivy

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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 io.netty.example.uptime;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.timeout.IdleStateHandler;


/**
 * Connects to a server periodically to measure and print the uptime of the
 * server.  This example demonstrates how to implement reliable reconnection
 * mechanism in Netty.
 */
public final class UptimeClient {

    static final String HOST = System.getProperty("host", "127.0.0.1");
    static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
    // Sleep 5 seconds before a reconnection attempt.
    static final int RECONNECT_DELAY = Integer.parseInt(System.getProperty("reconnectDelay", "5"));
    // Reconnect when the server sends nothing for 10 seconds.
    static final int READ_TIMEOUT = Integer.parseInt(System.getProperty("readTimeout", "10"));

    private static final UptimeClientHandler handler = new UptimeClientHandler();

    public static void main(String[] args) throws Exception {
        configureBootstrap(new Bootstrap()).connect();
    }

    private static Bootstrap configureBootstrap(Bootstrap b) {
        return configureBootstrap(b, new NioEventLoopGroup());
    }

    static Bootstrap configureBootstrap(Bootstrap b, EventLoopGroup g) {
        b.group(g)
         .channel(NioSocketChannel.class)
         .remoteAddress(HOST, PORT)
         .handler(new ChannelInitializer() {
            @Override
            public void initChannel(SocketChannel ch) throws Exception {
                ch.pipeline().addLast(new IdleStateHandler(READ_TIMEOUT, 0, 0), handler);
            }
         });

        return b;
    }

    static void connect(Bootstrap b) {
        b.connect().addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (future.cause() != null) {
                    handler.startTime = -1;
                    handler.println("Failed to connect: " + future.cause());
                }
            }
        });
    }
}