Java tutorial
/* * 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.flysoloing.learning.network.netty.factorial; import io.netty.bootstrap.Bootstrap; import io.netty.channel.ChannelFuture; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; 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; /** * Sends a sequence of integers to a {@link FactorialServer} to calculate * the factorial of the specified integer. */ public final class FactorialClient { 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", "8322")); static final int COUNT = Integer.parseInt(System.getProperty("count", "1000")); public static void main(String[] args) throws Exception { // Configure SSL. final SslContext sslCtx; if (SSL) { sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build(); } else { sslCtx = null; } EventLoopGroup group = new NioEventLoopGroup(); try { Bootstrap b = new Bootstrap(); b.group(group).channel(NioSocketChannel.class).handler(new FactorialClientInitializer(sslCtx)); // Make a new connection. ChannelFuture f = b.connect(HOST, PORT).sync(); // Get the handler instance to retrieve the answer. FactorialClientHandler handler = (FactorialClientHandler) f.channel().pipeline().last(); // Print out the answer. System.err.format("Factorial of %,d is: %,d", COUNT, handler.getFactorial()); } finally { group.shutdownGracefully(); } } }