/*
* Copyright 2011 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.localtime;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.Executors;
import io.netty.bootstrap.ClientBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.socket.nio.NioClientSocketChannelFactory;
/**
* Sends a list of continent/city pairs to a {@link LocalTimeServer} to
* get the local times of the specified cities.
*/
public class LocalTimeClient {
private final String host;
private final int port;
private final Collection<String> cities;
public LocalTimeClient(String host, int port, Collection<String> cities) {
this.host = host;
this.port = port;
this.cities = new ArrayList<String>();
this.cities.addAll(cities);
}
public void run() {
// Set up.
ClientBootstrap bootstrap = new ClientBootstrap(
new NioClientSocketChannelFactory(
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool()));
// Configure the event pipeline factory.
bootstrap.setPipelineFactory(new LocalTimeClientPipelineFactory());
// Make a new connection.
ChannelFuture connectFuture =
bootstrap.connect(new InetSocketAddress(host, port));
// Wait until the connection is made successfully.
Channel channel = connectFuture.awaitUninterruptibly().getChannel();
// Get the handler instance to initiate the request.
LocalTimeClientHandler handler =
channel.getPipeline().get(LocalTimeClientHandler.class);
// Request and get the response.
List<String> response = handler.getLocalTimes(cities);
// Close the connection.
channel.close().awaitUninterruptibly();
// Shut down all thread pools to exit.
bootstrap.releaseExternalResources();
// Print the response at last but not least.
Iterator<String> i1 = cities.iterator();
Iterator<String> i2 = response.iterator();
while (i1.hasNext()) {
System.out.format("%28s: %s%n", i1.next(), i2.next());
}
}
public static void main(String[] args) throws Exception {
// Print usage if necessary.
if (args.length < 3) {
printUsage();
return;
}
// Parse options.
String host = args[0];
int port = Integer.parseInt(args[1]);
Collection<String> cities = parseCities(args, 2);
if (cities == null) {
return;
}
new LocalTimeClient(host, port, cities).run();
}
private static void printUsage() {
System.err.println(
"Usage: " + LocalTimeClient.class.getSimpleName() +
" <host> <port> <continent/city_name> ...");
System.err.println(
"Example: " + LocalTimeClient.class.getSimpleName() +
" localhost 8080 America/New_York Asia/Seoul");
}
private static List<String> parseCities(String[] args, int offset) {
List<String> cities = new ArrayList<String>();
for (int i = offset; i < args.length; i ++) {
if (!args[i].matches("^[_A-Za-z]+/[_A-Za-z]+$")) {
System.err.println("Syntax error: '" + args[i] + "'");
printUsage();
return null;
}
cities.add(args[i].trim());
}
return cities;
}
}