91 lines
3.0 KiB
Java
91 lines
3.0 KiB
Java
/*
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* Copyright 2011 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.factorial;
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import java.net.InetSocketAddress;
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import java.util.concurrent.Executors;
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import io.netty.bootstrap.ClientBootstrap;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.socket.nio.NioClientSocketChannelFactory;
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/**
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* Sends a sequence of integers to a {@link FactorialServer} to calculate
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* the factorial of the specified integer.
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*/
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public class FactorialClient {
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public static void main(String[] args) throws Exception {
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// Print usage if no argument is specified.
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if (args.length != 3) {
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System.err.println(
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"Usage: " + FactorialClient.class.getSimpleName() +
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" <host> <port> <count>");
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return;
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}
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// Parse options.
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String host = args[0];
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int port = Integer.parseInt(args[1]);
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int count = Integer.parseInt(args[2]);
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if (count <= 0) {
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throw new IllegalArgumentException("count must be a positive integer.");
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}
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new FactorialClient(host, port, count).run();
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}
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private final String host;
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private final int port;
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private final int count;
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public FactorialClient(String host, int port, int count) {
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this.host = host;
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this.port = port;
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this.count = count;
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}
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public void run() {
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// Configure the client.
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ClientBootstrap bootstrap = new ClientBootstrap(
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new NioClientSocketChannelFactory(
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Executors.newCachedThreadPool(),
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Executors.newCachedThreadPool()));
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// Set up the event pipeline factory.
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bootstrap.setPipelineFactory(new FactorialClientPipelineFactory(count));
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// Make a new connection.
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ChannelFuture connectFuture =
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bootstrap.connect(new InetSocketAddress(host, port));
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// Wait until the connection is made successfully.
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Channel channel = connectFuture.awaitUninterruptibly().getChannel();
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// Get the handler instance to retrieve the answer.
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FactorialClientHandler handler =
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(FactorialClientHandler) channel.getPipeline().getLast();
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// Print out the answer.
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System.err.format(
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"Factorial of %,d is: %,d", count, handler.getFactorial());
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// Shut down all thread pools to exit.
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bootstrap.releaseExternalResources();
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}
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}
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