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package derms.frontend;
import java.io.IOException;
import java.net.*;
import javax.xml.ws.Endpoint;
import derms.Config;
import derms.Request;
import derms.Response;
import derms.net.runicast.ReliableUnicastReceiver;
import derms.net.runicast.ReliableUnicastSender;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
//import constants.Constants;
public class FE {
public static final String usage = "Usage: java FE <FE IP> <Sequencer IP>";
private static String frontendIP;
private static String sequencerIP;
private static ReliableUnicastSender<Request> sequencerSock;
private static final String RM_Multicast_group_address = Config.group.toString();
private static final int RM_Multicast_Port = 1234;
private static AtomicInteger sequenceIDGenerator = new AtomicInteger(0);
private static final ExecutorService executor = Executors.newFixedThreadPool(4);
public static void main(String[] args) {
try {
if (args.length < 2) {
System.out.println(usage);
return;
}
frontendIP = args[0];
sequencerIP = args[1];
System.out.println("Connecting to sequencer ("
+ sequencerIP + ":" + Config.sequencerInPort + ")...");
sequencerSock = new ReliableUnicastSender<Request>(
new InetSocketAddress(sequencerIP, Config.sequencerInPort));
FEInterface inter = new FEInterface() {
@Override
public void informRmHasBug(int RmNumber) {
// String errorMessage = new MyRequest(RmNumber, "1").toString();
Request errorMessage = new Request(RmNumber, "1");
System.out.println("Rm:" + RmNumber + "has bug");
// sendMulticastFaultMessageToRms(errorMessage);
sendUnicastToSequencer(errorMessage);
}
@Override
public void informRmIsDown(int RmNumber) {
// String errorMessage = new MyRequest(RmNumber, "2").toString();
Request errorMessage = new Request(RmNumber, "2");
System.out.println("Rm:" + RmNumber + "is down");
// sendMulticastFaultMessageToRms(errorMessage);
sendUnicastToSequencer(errorMessage);
}
@Override
public int sendRequestToSequencer(Request myRequest) {
int r = sendUnicastToSequencer(myRequest);
System.out.println("request: " + myRequest + " returned " + r);
return r;
}
@Override
public void retryRequest(Request request) {
System.out.println("No response from all Rms, Retrying request...");
sendUnicastToSequencer(request);
}
};
DERMSServerImpl servant = new DERMSServerImpl(inter);
Endpoint endpoint = Endpoint.publish(endpointURL(frontendIP), servant);
Runnable task = () -> {
try {
listenForUDPResponses(servant);
sequencerSock.close();
} catch (Exception e) {
e.printStackTrace();
}
};
Thread thread = new Thread(task);
thread.start();
} catch (Exception e) {
// System.err.println("Exception: " + e);
e.printStackTrace(System.out);
// Logger.serverLog(serverID, "Exception: " + e);
}
// System.out.println("FrontEnd Server Shutting down");
// Logger.serverLog(serverID, " Server Shutting down");
}
// The URL where the web service endpoint is published.
public static String endpointURL(String frontendHost) {
return "http://" + frontendHost + ":" + Config.frontendEndpointPort + "/" + DERMSInterface.class.getSimpleName();
}
private static int sendUnicastToSequencer(Request requestFromClient) {
int sequenceID = sequenceIDGenerator.incrementAndGet();
requestFromClient.setId(sequenceID);
try {
sequencerSock.send(requestFromClient);
} catch (IOException e) {
System.out.println("Failed: " + requestFromClient.noRequestSendError());
e.printStackTrace();
System.out.println("IO: " + e.getMessage());
}
return sequenceID;
}
public static void sendMulticastFaultMessageToRms(String errorMessage) {
DatagramSocket aSocket = null;
try {
aSocket = new DatagramSocket();
byte[] messages = errorMessage.getBytes();
InetAddress aHost = InetAddress.getByName(RM_Multicast_group_address);
DatagramPacket request = new DatagramPacket(messages, messages.length, aHost, RM_Multicast_Port);
System.out.println("FE:sendMulticastFaultMessageToRms>>>" + errorMessage);
aSocket.send(request);
} catch (IOException e) {
e.printStackTrace();
}
}
// private static void listenForUDPResponses(DERMSServerImpl servant) {
// DatagramSocket aSocket = null;
// try {
//
//// aSocket = new MulticastSocket(1413);
//// InetAddress[] allAddresses = Inet4Address.getAllByName("SepJ-ROG");
// InetAddress desiredAddress = InetAddress.getByName(FE_IP_Address);
//// //In order to find the desired Ip to be routed by other modules (WiFi adapter)
//// for (InetAddress address :
//// allAddresses) {
//// if (address.getHostAddress().startsWith("192.168.2")) {
//// desiredAddress = address;
//// }
//// }
//// aSocket.joinGroup(InetAddress.getByName("230.1.1.5"));
// aSocket = new DatagramSocket(FE_PORT, desiredAddress);
// byte[] buffer = new byte[1000];
// System.out.println("FE Server Started on " + desiredAddress + ":" + FE_PORT + "............");
//
// while (true) {
// DatagramPacket response = new DatagramPacket(buffer, buffer.length);
// aSocket.receive(response);
// String sentence = new String(response.getData(), 0,
// response.getLength()).trim();
// System.out.println("FE:Response received from Rm>>>" + sentence);
// Response rmResponse = new Response(sentence);
//// String[] parts = sentence.split(";");
//
// System.out.println("Adding response to FrontEndImplementation:");
// servant.addReceivedResponse(rmResponse);
//// DatagramPacket reply = new DatagramPacket(response.getData(), response.getLength(), response.getAddress(),
//// response.getPort());
//// aSocket.send(reply);
// }
//
// } catch (SocketException e) {
// System.out.println("Socket: " + e.getMessage());
// } catch (IOException e) {
// System.out.println("IO: " + e.getMessage());
// } finally {
/// / if (aSocket != null)
/// / aSocket.close();
// }
// }
private static void listenForUDPResponses(DERMSServerImpl servant) {
List<ReliableUnicastReceiver<Response>> receivers = new ArrayList<ReliableUnicastReceiver<Response>>();
// Initialize a receiver for each RM.
for (int port : Config.frontendResponsePorts) {
try {
receivers.add(new ReliableUnicastReceiver<Response>(
new InetSocketAddress(frontendIP, port)));
} catch (IOException e) {
throw new RuntimeException(e);
}
System.out.println("FE listening for responses on " + frontendIP + ":" + port + "...");
}
for (ReliableUnicastReceiver<Response> receiver : receivers) {
executor.execute(() -> {
try {
while (true) {
// Receive a response from each RM.
// Blocking call to receive a message from RM
Response response;
response = receiver.receive();
System.out.println("FE: Response received from RM >>> " + response);
// Process the received response and add it to the servant
System.out.println("Adding response to FrontEndImplementation:");
servant.addReceivedResponse(response);
}
} catch (InterruptedException e) {
System.out.println("Listener interrupted: " + e.getMessage());
Thread.currentThread().interrupt();
} finally {
try {
receiver.close();
System.out.println("ReliableUnicastReceiver closed.");
} catch (IOException e) {
System.out.println("Error closing ReliableUnicastReceiver: " + e.getMessage());
}
}
});
}
try {
executor.awaitTermination(100, TimeUnit.HOURS);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
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