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Diffstat (limited to 'vnfs/vLB/DNSClient/src/main/java/FDClient.java')
-rw-r--r--vnfs/vLB/DNSClient/src/main/java/FDClient.java73
1 files changed, 73 insertions, 0 deletions
diff --git a/vnfs/vLB/DNSClient/src/main/java/FDClient.java b/vnfs/vLB/DNSClient/src/main/java/FDClient.java
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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) {}
+ }
+}