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
new file mode 100644
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--- /dev/null
+++ b/vnfs/vLB/DNSClient/src/main/java/FDClient.java
@@ -0,0 +1,73 @@
+
+/*************************************************************************//**
+ *
+ * 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) {}
+	}
+}