nenea.client.operation.UptimeClient.java Source code

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Here is the source code for nenea.client.operation.UptimeClient.java

Source

package nenea.client.operation;

/*
 * 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.
 */

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
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 boolean SSL = System.getProperty("ssl") != null;
    static final String HOST = System.getProperty("host", "127.0.0.1");
    static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "6443" : "6443"));

    // Sleep 5 seconds before a reconnection attempt.
    static final int RECONNECT_DELAY = Integer.parseInt(System.getProperty("reconnectDelay", "10"));
    // Reconnect when the server sends nothing for 100 seconds.
    static final int READ_TIMEOUT = Integer.parseInt(System.getProperty("readTimeout", "300"));

    // handler
    private static final UptimeClientHandler uptimeHandler = new UptimeClientHandler();
    private static final OperationClientHandler operationhandler = new OperationClientHandler();

    public static void start() throws Exception {
        configureBootstrap(new Bootstrap()).connect();
    }

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

    static Bootstrap configureBootstrap(Bootstrap b, EventLoopGroup g) throws Exception {

        System.out.println("ssl : " + SSL + ", port : " + PORT);

        // Configure SSL.
        final SslContext sslCtx;
        if (SSL) {
            // ?? ? ?.  x.509??  
            sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
            //sslCtx = SslContextBuilder.forClient().trustManager(SimpleTrustManagerFactory.getInstance("nene")).build();
        } else {
            sslCtx = null;
        }

        b.group(g).channel(NioSocketChannel.class).remoteAddress(HOST, PORT)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    public void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline p = ch.pipeline();
                        if (sslCtx != null) {
                            p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
                        }
                        p.addLast(
                                // IdleStateHandler @sharable? ? new .
                                new IdleStateHandler(READ_TIMEOUT, 0, 0), uptimeHandler, operationhandler);
                    }
                });

        return b;
    }

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