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package derms;
import derms.frontend.FEInterface;
import derms.Request;
import derms.Response;
import derms.net.MessagePayload;
import derms.net.tomulticast.TotalOrderMulticastReceiver;
import derms.net.runicast.ReliableUnicastSender;
import derms.net.tomulticast.TotalOrderMulticastSender;
import derms.replica1.Replica1;
import derms.replica2.Replica2;
import derms.util.*;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.Socket;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.util.Objects;
import java.util.logging.Logger;
public class ReplicaManager {
public static final String usage = "Usage: java ReplicaManager <replicaId> <city> <frontEndIP> <byzantine(0 or 1)> <crash(0 or 1)>";
private final int replicaId;
private final String city;
private Replica replica;
private Response response;
private final Logger log;
private InetSocketAddress frontEndAddress;
private ReliableUnicastSender<Response> unicastSender;
private TotalOrderMulticastReceiver multicastReceiver;
public ReplicaManager(int replicaId, String city, InetAddress frontEndIP, int byzantine, int crash) throws IOException {
this.replicaId = replicaId;
this.city = city;
this.log = Logger.getLogger(getClass().getName());
initUnicastSender(frontEndIP);
initReplica(byzantine, crash);
initMulticastReceiver();
startHeartbeatThread();
}
private void initUnicastSender(InetAddress frontEndIP) throws IOException {
int frontEndPort = Config.frontendResponsePorts[replicaId - 1];
frontEndAddress = new InetSocketAddress(frontEndIP, frontEndPort);
unicastSender = new ReliableUnicastSender<>(frontEndAddress);
}
private void initReplica(int byzantine, int crash) throws IOException {
switch (replicaId) {
case 1:
replica = new Replica1(this);
break;
case 2:
replica = new derms.replica2.Replica2(city, this);
break;
case 3:
replica = new derms.replica3.Replica3(city, this);
break;
case 4:
replica = new derms.replica2.Replica2(city, this);
break;
}
// [TEST] Logging
if (byzantine == 0) {
TestLogger.log("REPLICA " + replicaId + ": {BYZANTINE: FALSE}");
} else {
TestLogger.log("REPLICA " + replicaId + ": {BYZANTINE: TRUE}");
}
if (crash == 0) {
TestLogger.log("REPLICA " + replicaId + ": {CRASH: FALSE}");
} else {
TestLogger.log("REPLICA " + replicaId + ": {CRASH: TRUE}");
}
replica.startProcess(byzantine, crash);
}
private void initMulticastReceiver() throws IOException {
InetSocketAddress group = Config.group;
InetAddress localAddress = InetAddress.getLocalHost(); // Your local address
NetworkInterface netInterface = NetworkInterface.getByInetAddress(localAddress);
multicastReceiver = new TotalOrderMulticastReceiver<Request>(group, localAddress, netInterface);
new Thread(() -> {
while (true) {
try {
MessagePayload receivedPayload = multicastReceiver.receive();
Request request = (Request) receivedPayload;
log.info("Received request: " + request);
if (Objects.equals(request.getMessageType(), "1" + replicaId)) {
handleByzantineFailure();
} else {
replica.processRequest(request);
}
} catch (InterruptedException e) {
log.severe("Failed to receive request: " + e.getMessage());
Thread.currentThread().interrupt();
} catch (Exception e) {
log.severe("Error processing request: " + e.getMessage());
}
}
}).start();
}
private void startHeartbeatThread() {
new Thread(() -> {
while (true) {
if (!replica.isAlive()) {
// [TEST] Logging
TestLogger.log("REPLICA " + replicaId + ": {CRASH: DETECTED}");
informFrontEndRmIsDown(replica.getId());
replica.restart();
//TestLogger.log("REPLICA " + replicaId + ": {RESTARTED}");
}
try {
Thread.sleep(5000); // Example 5 seconds.
} catch (InterruptedException e) {
log.severe("Heartbeat thread interrupted: " + e.getMessage());
}
}
}).start();
}
public void sendResponseToFE(Response response) {
try {
unicastSender.send(response);
} catch (IOException e) {
log.severe("Failed to send response to FE: " + e.getMessage());
}
}
public void handleByzantineFailure() {
log.severe("Byzantine failure detected in Replica " + replica.getId());
// [TEST] Logging
TestLogger.log("REPLICA " + replicaId + ": {BYZANTINE: DETECTED}");
replica.restart();
informFrontEndRmHasBug(replica.getId());
//TestLogger.log("REPLICA " + replicaId + ": {RESTARTED}");
}
private void informFrontEndRmIsDown(int replicaId) {
try (Socket socket = new Socket(frontEndAddress.getAddress(), frontEndAddress.getPort());
ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream())) {
out.writeObject("RM_DOWN:" + replicaId);
} catch (IOException e) {
log.severe("Failed to inform FE that RM is down: " + e.getMessage());
TestLogger.log("[FAILED TO INFORM FE (RM IS DOWN)]");
}
}
private void informFrontEndRmHasBug(int replicaId) {
try (Socket socket = new Socket(frontEndAddress.getAddress(), frontEndAddress.getPort());
ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream())) {
out.writeObject("RM_BUG:" + replicaId);
} catch (IOException e) {
log.severe("Failed to inform FE that RM has a bug: " + e.getMessage());
TestLogger.log("[FAILED TO INFORM FE (RM HAS A BUG)]");
}
}
public static void main(String[] args) {
if (args.length < 3) {
System.err.println(usage);
System.exit(1);
}
try {
int replicaId = Integer.parseInt(args[0]);
String city = args[1];
InetAddress frontEndIP = InetAddress.getByName(args[2]);
int byzantine = Integer.parseInt(args[3]);
int crash = Integer.parseInt(args[4]);
ReplicaManager replicaManager = new ReplicaManager(replicaId, city, frontEndIP, byzantine, crash);
System.out.println("ReplicaManager " + replicaId + " is running.");
} catch (IOException e) {
System.err.println("Failed to start ReplicaManager: " + e.getMessage());
TestLogger.log("[FAILED TO START RM]");
e.printStackTrace();
}
}
public int getReplicaId() { return replicaId; }
}
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