io.netty.example.factorial.FactorialClient Maven / Gradle / Ivy
/*
* 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.factorial;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
/**
* Sends a sequence of integers to a {@link FactorialServer} to calculate
* the factorial of the specified integer.
*/
public class FactorialClient {
private final String host;
private final int port;
private final int count;
public FactorialClient(String host, int port, int count) {
this.host = host;
this.port = port;
this.count = count;
}
public void run() throws Exception {
Bootstrap b = new Bootstrap();
try {
b.group(new NioEventLoopGroup())
.channel(NioSocketChannel.class)
.handler(new FactorialClientInitializer(count));
// 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 {
b.shutdown();
}
}
public static void main(String[] args) throws Exception {
// Print usage if no argument is specified.
if (args.length != 3) {
System.err.println(
"Usage: " + FactorialClient.class.getSimpleName() +
" ");
return;
}
// Parse options.
String host = args[0];
int port = Integer.parseInt(args[1]);
int count = Integer.parseInt(args[2]);
if (count <= 0) {
throw new IllegalArgumentException("count must be a positive integer.");
}
new FactorialClient(host, port, count).run();
}
}