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/*************************************************************************//**
*
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
*
* 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 main.java;
import java.io.*;
import java.net.*;
/*
* Client-side Failure Detector (FD) implementation.
* @param server_addr: IP address of the remote server
* @param port: the port that the FD service listens for incoming UDP packets
* @param timeout: how often the FD checks the status of client processes
* @param debug: debug mode on/off
*/
public class FDClient implements Runnable {
private String PID;
private String SERVER_ADDR;
private int PORT;
private long TIMEOUT;
private boolean DEBUG;
public FDClient(String pid, String server_addr, int port, long timeout, boolean debug) throws IOException {
PID = pid;
SERVER_ADDR = server_addr;
PORT = port;
TIMEOUT = timeout;
DEBUG = debug;
(new Thread(this)).start();
}
@SuppressWarnings("resource")
@Override
public void run() {
// Define a DatagramSocket object to send packets to the server
try {
DatagramSocket sock = new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName(SERVER_ADDR);
// Allocate buffer for the PING message
String content = "PING:" + PID;
byte[] buffer = content.getBytes();
// Sent a PING message every TIMEOUT milliseconds
while(true) {
DatagramPacket packet = new DatagramPacket(buffer, buffer.length, IPAddress, PORT);
sock.send(packet);
if(DEBUG) System.out.println("Sent PING message to server " + SERVER_ADDR + ":" + PORT);
try {
Thread.sleep(TIMEOUT);
}
catch(InterruptedException e) {}
}
} catch(IOException e) {}
}
}
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