Added Replica4

1 files changed, 0 insertions, 479 deletions

diff --git a/src/main/java/derms/Replica3pkg/Server.java b/src/main/java/derms/Replica3pkg/Server.java
deleted file mode 100644
index 474e6f5..0000000
--- a/src/main/java/derms/Replica3pkg/Server.java
+++ /dev/null
@@ -1,479 +0,0 @@
-//Server.java
-package derms.Replica3pkg;
-
-import javax.jws.WebService;
-import javax.jws.WebMethod;
-import java.io.*;
-import java.net.*;
-import java.util.*;
-
-@WebService(endpointInterface = "org.DERMS.DERMSInterface")
-public class Server implements DERMSInterface {
-    private String serverName;
-    private int udpPort;
-    private Map<String, Map<String, Resource>> resourceMap; //resourceName -> (resourceID -> Resource)
-    private Map<String, Set<String>> coordinatorResources; //coordinatorID -> Set<resourceID>
-    private Map<String, Map<String, Integer>> coordinatorResourceDurations; //coordinatorID -> (resourceID -> allocatedDuration)
-    private Map<String, Integer> serverUdpPorts; //serverName -> UDP port
-
-
-    public Server() {
-        this.resourceMap = new HashMap<>();
-        this.coordinatorResources = new HashMap<>();
-        this.coordinatorResourceDurations = new HashMap<>();
-        startUDPListener();
-    }
-
-    @WebMethod(exclude = true)
-    public void initServer(String serverName, int udpPort, Map<String, Integer> serverUdpPorts) {
-        this.serverName = serverName;
-        this.udpPort = udpPort;
-        this.serverUdpPorts = serverUdpPorts;
-    }
-
-    //Start UDP Listener
-    private void startUDPListener() {
-        new Thread(() -> {
-            try (DatagramSocket socket = new DatagramSocket(udpPort)) {
-                byte[] buffer = new byte[4096];
-                System.out.println(serverName + " UDP Server started on port " + udpPort);
-
-                while (true) {
-                    DatagramPacket request = new DatagramPacket(buffer, buffer.length);
-                    socket.receive(request);
-                    new Thread(() -> handleUDPRequest(request)).start();
-                }
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }).start();
-    }
-
-    //Handle UDP Request
-    private void handleUDPRequest(DatagramPacket requestPacket) {
-        try {
-            String requestData = new String(requestPacket.getData(), 0, requestPacket.getLength());
-            String[] parts = requestData.split(":");
-            String methodName = parts[0];
-            String[] params = Arrays.copyOfRange(parts, 1, parts.length);
-
-            String responseData = "";
-
-            switch (methodName) {
-                case "listResourceAvailability":
-                    responseData = handleListResourceAvailability(params[0]);
-                    break;
-                case "requestResource":
-                    responseData = handleLocalResourceRequest(params[0], params[1], Integer.parseInt(params[2]));
-                    break;
-                case "findResource":
-                    responseData = handleFindResource(params[0], params[1]);
-                    break;
-                case "returnResource":
-                    responseData = handleReturnResource(params[0], params[1]);
-                    break;
-                case "swapRequestResource":
-                    responseData = handleSwapRequestResource(params[0], params[1], Integer.parseInt(params[2]));
-                    break;    
-                case "swapReturnResource":
-                    responseData = handleSwapReturnResource(params[0], params[1]);
-                    break;
-                case "checkCoordinatorResource":
-                    responseData = checkCoordinatorHasResource(params[0], params[1]);
-                    break;
-                case "getCoordinatorResourceDuration":
-                    int duration = getCoordinatorResourceDuration(params[0], params[1]);
-                    responseData = String.valueOf(duration);
-                    break;
-                default:
-                    responseData = "Invalid method";
-            }
-
-            //Send response
-            byte[] responseBytes = responseData.getBytes();
-            DatagramPacket responsePacket = new DatagramPacket(responseBytes, responseBytes.length, requestPacket.getAddress(), requestPacket.getPort());
-            DatagramSocket socket = new DatagramSocket();
-            socket.send(responsePacket);
-            socket.close();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-
-    //Operation Handlers
-    private synchronized String handleListResourceAvailability(String resourceName) {
-        StringBuilder result = new StringBuilder();
-        resourceName = resourceName.toUpperCase();
-        Map<String, Resource> resources = resourceMap.get(resourceName);
-
-        if (resources != null) {
-            for (Resource resource : resources.values()) {
-            	if (resource.getDuration() > 0) {
-                    result.append(resource.getResourceName()).append(" - ").append(serverName).append(" ").append(resource.getDuration()).append("\n");
-            	}
-            }
-        }
-        return result.toString();
-    }
-
-    private synchronized String handleLocalResourceRequest(String coordinatorID, String resourceID, int duration) {
-        for (Map<String, Resource> resources : resourceMap.values()) {
-            Resource resource = resources.get(resourceID);
-            if (resource != null) {
-                if (resource.getDuration() >= duration) {
-                    resource.subDuration(duration);
-                    coordinatorResources.computeIfAbsent(coordinatorID, k -> new HashSet<>()).add(resourceID);
-                    coordinatorResourceDurations.computeIfAbsent(coordinatorID, k -> new HashMap<>()).put(resourceID, duration);
-
-                    log("Resource " + resourceID + " allocated to " + coordinatorID + " for duration " + duration);
-                    return "Resource " + resourceID + " allocated successfully.";
-                } else {
-                    return "Insufficient duration for resource " + resourceID;
-                }
-            }
-        }
-        return "Resource " + resourceID + " not found.";
-    }
-
-    private synchronized String handleFindResource(String coordinatorID, String resourceName) {
-        StringBuilder result = new StringBuilder();
-        resourceName = resourceName.toUpperCase();
-        Set<String> resources = coordinatorResources.get(coordinatorID);
-        if (resources != null) {
-            Map<String, Integer> resourceDurations = coordinatorResourceDurations.get(coordinatorID);
-            if (resourceDurations != null) {
-                for (String resourceID : resources) {
-                    Resource resource = getResourceByID(resourceID);
-                    if (resource != null && resource.getResourceName().equals(resourceName)) {
-                        Integer allocatedDuration = resourceDurations.get(resourceID);
-                        if (allocatedDuration != null) {
-                            result.append(resource.getResourceName()).append(" - ").append(resourceID).append(" ").append(allocatedDuration).append("\n");
-                        }
-                    }
-                }
-            }
-        }
-        return result.toString();
-    }
-
-    private synchronized String handleReturnResource(String coordinatorID, String resourceID) {
-        Set<String> resources = coordinatorResources.get(coordinatorID);
-        if (resources != null && resources.contains(resourceID)) {
-            resources.remove(resourceID);
-            if (resources.isEmpty()) {
-                coordinatorResources.remove(coordinatorID);
-            }
-            Resource resource = getResourceByID(resourceID);
-            if (resource != null) {
-                Map<String, Integer> resourceDurations = coordinatorResourceDurations.get(coordinatorID);
-                if (resourceDurations != null) {
-                    Integer allocatedDuration = resourceDurations.remove(resourceID);
-                    if (allocatedDuration != null) {
-                        resource.addDuration(allocatedDuration);
-                    }
-                    if (resourceDurations.isEmpty()) {
-                        coordinatorResourceDurations.remove(coordinatorID);
-                    }
-                }
-                log("Coordinator " + coordinatorID + " returned resource " + resourceID);
-                return "Resource " + resourceID + " returned successfully.";
-            } else {
-                return "Resource " + resourceID + " not found.";
-            }
-        } else {
-            return "You do not occupy resource " + resourceID + ".";
-        }
-    }
-
-    //Helper Methods
-    private Resource getResourceByID(String resourceID) {
-        for (Map<String, Resource> resources : resourceMap.values()) {
-            if (resources.containsKey(resourceID)) {
-                return resources.get(resourceID);
-            }
-        }
-        return null;
-    }
-    
-    private synchronized String handleSwapRequestResource(String coordinatorID, String resourceID, int duration) {
-        //Attempt to allocate the resource to the coordinator
-        for (Map<String, Resource> resources : resourceMap.values()) {
-            Resource resource = resources.get(resourceID);
-            if (resource != null) {
-                if (resource.getDuration() >= duration) {
-                    resource.subDuration(duration);
-                    coordinatorResources.computeIfAbsent(coordinatorID, k -> new HashSet<>()).add(resourceID);
-                    coordinatorResourceDurations.computeIfAbsent(coordinatorID, k -> new HashMap<>()).put(resourceID, duration);
-                    log("Resource " + resourceID + " temporarily allocated to " + coordinatorID + " for swapping, duration " + duration);
-                    return "Success";
-                } else {
-                    return "Insufficient duration for resource " + resourceID;
-                }
-            }
-        }
-        return "Resource " + resourceID + " not found.";
-    }
-    
-    private synchronized String handleSwapReturnResource(String coordinatorID, String resourceID) {
-        Set<String> resources = coordinatorResources.get(coordinatorID);
-        if (resources != null && resources.contains(resourceID)) {
-            resources.remove(resourceID);
-            if (resources.isEmpty()) {
-                coordinatorResources.remove(coordinatorID);
-            }
-            Resource resource = getResourceByID(resourceID);
-            if (resource != null) {
-                Map<String, Integer> resourceDurations = coordinatorResourceDurations.get(coordinatorID);
-                if (resourceDurations != null) {
-                    Integer allocatedDuration = resourceDurations.remove(resourceID);
-                    if (allocatedDuration != null) {
-                        resource.addDuration(allocatedDuration);
-                    }
-                    if (resourceDurations.isEmpty()) {
-                        coordinatorResourceDurations.remove(coordinatorID);
-                    }
-                }
-                log("Coordinator " + coordinatorID + " resource " + resourceID + " allocation undone during swap");
-                return "Success";
-            } else {
-                return "Resource " + resourceID + " not found.";
-            }
-        } else {
-            return "Coordinator did not acquire resource " + resourceID;
-        }
-    }
-
-    private String sendUDPRequest(String serverName, String methodName, String... params) {
-        String response = "";
-        try {
-            InetAddress host = InetAddress.getByName("localhost");
-            int port = serverUdpPorts.get(serverName);
-            String requestData = methodName + ":" + String.join(":", params);
-
-            byte[] requestBytes = requestData.getBytes();
-            DatagramPacket requestPacket = new DatagramPacket(requestBytes, requestBytes.length, host, port);
-
-            DatagramSocket socket = new DatagramSocket();
-            socket.send(requestPacket);
-
-            byte[] buffer = new byte[4096];
-            DatagramPacket responsePacket = new DatagramPacket(buffer, buffer.length);
-            socket.receive(responsePacket);
-
-            response = new String(responsePacket.getData(), 0, responsePacket.getLength());
-            socket.close();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-        return response;
-    }
-
-    //Implement ResponderInterface Methods
-    @Override
-    public synchronized String addResource(String resourceID, String resourceName, int duration) {
-        resourceName = resourceName.toUpperCase();
-        Map<String, Resource> resources = resourceMap.computeIfAbsent(resourceName, k -> new HashMap<>());
-        Resource resource = resources.get(resourceID);
-
-        if (resource != null) {
-            if (duration > resource.getDuration()) {
-                resource.setDuration(duration);
-                log("Updated duration of resource " + resourceID);
-                return "Resource " + resourceID + " duration updated.";
-            } else {
-                log("Resource " + resourceID + " already exists with greater or equal duration.");
-                return "Resource " + resourceID + " already exists with greater or equal duration.";
-            }
-        } else {
-            resource = new Resource(resourceName, duration);
-            resources.put(resourceID, resource);
-            log("Added new resource " + resourceID);
-            return "Resource " + resourceID + " added successfully.";
-        }
-    }
-
-    @Override
-    public synchronized String removeResource(String resourceID, int duration) {
-        for (Map<String, Resource> resources : resourceMap.values()) {
-            Resource resource = resources.get(resourceID);
-            if (resource != null) {
-                if (duration >= resource.getDuration()) {
-                    resources.remove(resourceID);
-                    log("Resource " + resourceID + " completely removed.");
-                    return "Resource " + resourceID + " completely removed.";
-                } else {
-                    resource.subDuration(duration);
-                    log("Decreased duration of resource " + resourceID);
-                    return "Resource " + resourceID + " duration decreased by " + duration + ".";
-                }
-            }
-        }
-        log("Resource " + resourceID + " not found.");
-        return "Resource " + resourceID + " not found.";
-    }
-
-    @Override
-    public String listResourceAvailability(String resourceName) {
-        resourceName = resourceName.toUpperCase();
-        StringBuilder result = new StringBuilder();
-
-        synchronized (this) {
-            Map<String, Resource> resources = resourceMap.get(resourceName);
-            if (resources != null) {
-                for (Resource resource : resources.values()) {
-                	if (resource.getDuration() > 0) {
-	                    result.append(resource.getResourceName()).append(" - ").append(serverName).append(" ").append(resource.getDuration()).append("\n");
-	                }
-                }
-            }
-        }
-
-        for (String otherServer : serverUdpPorts.keySet()) {
-            if (!otherServer.equals(serverName)) {
-                String response = sendUDPRequest(otherServer, "listResourceAvailability", resourceName);
-                result.append(response);
-            }
-        }
-
-        return result.toString();
-    }
-
-    @Override
-    public String requestResource(String coordinatorID, String resourceID, int duration) {
-        String resourceServer = resourceID.substring(0, 3).toUpperCase();
-        String response;
-
-        if (resourceServer.equals(serverName)) {
-            response = handleLocalResourceRequest(coordinatorID, resourceID, duration);
-        } else {
-            response = sendUDPRequest(resourceServer, "requestResource", coordinatorID, resourceID, String.valueOf(duration));
-        }
-
-        log("Coordinator " + coordinatorID + " requested resource " + resourceID + ": " + response);
-        return response;
-    }
-
-    @Override
-    public String findResource(String coordinatorID, String resourceName) {
-        resourceName = resourceName.toUpperCase();
-        StringBuilder result = new StringBuilder();
-
-        for (String otherServer : serverUdpPorts.keySet()) {
-            String response;
-            if (otherServer.equals(serverName)) {
-                response = handleFindResource(coordinatorID, resourceName);
-            } else {
-                response = sendUDPRequest(otherServer, "findResource", coordinatorID, resourceName);
-            }
-            result.append(response);
-        }
-
-        return result.toString();
-    }
-
-    @Override
-    public String returnResource(String coordinatorID, String resourceID) {
-        String resourceServer = resourceID.substring(0, 3).toUpperCase();
-        String response;
-
-        if (resourceServer.equals(serverName)) {
-            response = handleReturnResource(coordinatorID, resourceID);
-        } else {
-            response = sendUDPRequest(resourceServer, "returnResource", coordinatorID, resourceID);
-        }
-
-        log("Coordinator " + coordinatorID + " returned resource " + resourceID + ": " + response);
-        return response;
-    }
-    
-    private synchronized int getCoordinatorResourceDuration(String coordinatorID, String resourceID) {
-        Map<String, Integer> resourceDurations = coordinatorResourceDurations.get(coordinatorID);
-        if (resourceDurations != null && resourceDurations.containsKey(resourceID)) {
-            return resourceDurations.get(resourceID);
-        }
-        return 0;
-    }
-    
-    private synchronized String checkCoordinatorHasResource(String coordinatorID, String resourceID) {
-        Set<String> resources = coordinatorResources.get(coordinatorID);
-        if (resources != null && resources.contains(resourceID)) {
-            return "true";
-        }
-        return "false";
-    }
-    
-    @Override
-    public String swapResource(String coordinatorID, String oldResourceID, String oldResourceType, String newResourceID, String newResourceType) {
-        String oldResourceServer = oldResourceID.substring(0, 3).toUpperCase();
-        String newResourceServer = newResourceID.substring(0, 3).toUpperCase();
-
-        //Check if the coordinator has the old resource
-        String checkOldResourceResponse;
-        if (oldResourceServer.equals(serverName)) {
-            checkOldResourceResponse = checkCoordinatorHasResource(coordinatorID, oldResourceID);
-        } else {
-            checkOldResourceResponse = sendUDPRequest(oldResourceServer, "checkCoordinatorResource", coordinatorID, oldResourceID);
-        }
-
-        if (!checkOldResourceResponse.equals("true")) {
-            return "Coordinator has not acquired the old resource.";
-        }
-
-        //Get the duration allocated to the old resource
-        int duration;
-        if (oldResourceServer.equals(serverName)) {
-            duration = getCoordinatorResourceDuration(coordinatorID, oldResourceID);
-        } else {
-            String durationStr = sendUDPRequest(oldResourceServer, "getCoordinatorResourceDuration", coordinatorID, oldResourceID);
-            duration = Integer.parseInt(durationStr);
-        }
-
-        //Attempt to acquire the new resource
-        String requestResponse;
-        if (newResourceServer.equals(serverName)) {
-            requestResponse = handleLocalResourceRequest(coordinatorID, newResourceID, duration);
-        } else {
-            requestResponse = sendUDPRequest(newResourceServer, "requestResource", coordinatorID, newResourceID, String.valueOf(duration));
-        }
-
-        if (!requestResponse.contains("allocated successfully")) {
-            return "Failed to acquire new resource: " + requestResponse;
-        }
-
-        //Return the old resource
-        String returnResponse;
-        if (oldResourceServer.equals(serverName)) {
-            returnResponse = handleReturnResource(coordinatorID, oldResourceID);
-        } else {
-            returnResponse = sendUDPRequest(oldResourceServer, "returnResource", coordinatorID, oldResourceID);
-        }
-
-        if (!returnResponse.contains("returned successfully")) {
-            //Undo the allocation of the new resource
-            if (newResourceServer.equals(serverName)) {
-                handleReturnResource(coordinatorID, newResourceID);
-            } else {
-                sendUDPRequest(newResourceServer, "returnResource", coordinatorID, newResourceID);
-            }
-            return "Failed to return old resource: " + returnResponse;
-        }
-
-        log("Coordinator " + coordinatorID + " swapped resource " + oldResourceID + " with " + newResourceID);
-
-        return "Resource swap successful.";
-    }
-
-    //Logging method
-    private synchronized void log(String message) {
-        String logMessage = new Date() + " - " + message;
-        System.out.println(logMessage);
-
-        try (FileWriter fw = new FileWriter(serverName + "_server_log.txt", true);
-             BufferedWriter bw = new BufferedWriter(fw);
-             PrintWriter out = new PrintWriter(bw)) {
-            out.println(logMessage);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-}
\ No newline at end of file