/*
* Copyright 2017 MovingBlocks
*
* Licensed 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 org.terasology.network;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.Callable;
/**
* A {@link Callable} that sends a ping to the specified host and returns the time in milliseconds.
*/
public class PingService implements Callable<Long> {
private final String address;
private final int port;
private int timeout = 10000;
public PingService(String address, int port) {
this.address = address;
this.port = port;
}
/**
* @return the ping time in milliseconds
*/
@Override
public Long call() throws IOException {
Instant start = Instant.now();
try (Socket sock = new Socket()) {
InetSocketAddress endpoint = new InetSocketAddress(address, port);
// One alternative is InetAddress.isReachable(), but it seems to require
// root privileges under some operating systems
sock.connect(endpoint, timeout);
Instant end = Instant.now();
sock.close();
long millis = Duration.between(start, end).toMillis();
return millis;
}
}
}