Added Peer notification sendable and requestable.

src/main/java/vslab1/src/Request/Data/ReceivedPeerNotification.java

@@ -0,0 +1,43 @@
+package vslab1.src.Request.Data;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.json.JSONArray;
+
+import vslab1.src.FileReaderWriter.FileReaderWriter;
+import vslab1.src.Peers.EOnlineState;
+import vslab1.src.Peers.Peer;
+import vslab1.src.Sending.SendingQueue;
+import vslab1.src.Sending.Data.EDataType;
+
+/**
+ * Received peer message from peers in network to this newly joined peer. This peer will update its
+ * peer list with received file list and set online state of the peer to online.
+ */
+public record ReceivedPeerNotification(Peer sender, Peer receiver, JSONArray sender_files) implements Requestable {
+
+    @Override
+    public EDataType getType() {
+        return EDataType.PeerNotification;
+    }
+
+    @Override
+    public Peer getSender() {
+        return sender;
+    }
+
+    @Override
+    public Peer getReceiver() {
+        return receiver;
+    }
+
+    @Override
+    public void execute(SendingQueue sendingQueue) {
+        Map<String, String> filesMap = new HashMap<String, String>();
+        sender_files.forEach((file) -> {
+            filesMap.put(file.toString(), "");
+        });
+        FileReaderWriter.updatePeer(new Peer(sender.ipAddress(), sender.port(), filesMap, EOnlineState.Online));
+    }
+}

src/main/java/vslab1/src/Request/RequestExecuterThread.java

@@ -16,7 +16,7 @@ import vslab1.src.Request.Data.ReceivedLeaveNotification;
 import vslab1.src.Request.Data.ReceivedOnlineStateNotification;
 import vslab1.src.Request.Data.OnlineStateRequestRequest;
 import vslab1.src.Request.Data.ReceivedPeerJoinedNotification;
-import vslab1.src.Request.Data.ReceivedPeerResponse;
+import vslab1.src.Request.Data.ReceivedPeerNotification;
 import vslab1.src.Request.Data.PublishFileNameNotificationRequest;
 import vslab1.src.Request.Data.PullFileListRequestRequest;
 import vslab1.src.Request.Data.PullFileRequestRequest;
@@ -92,7 +92,7 @@ public class RequestExecuterThread extends Thread implements Terminatable {
             }
             if (receivedData.has("peer")) {
                 JSONArray files = receivedData.getJSONArray("files");
-                return new ReceivedPeerResponse(parseIPPortField(receivedData), FileReaderWriter.getThisPeer(EUpdateFlag.DoNotUpdate), files);
+                return new ReceivedPeerNotification(parseIPPortField(receivedData), FileReaderWriter.getThisPeer(EUpdateFlag.DoNotUpdate), files);
             }
             if (receivedData.has("leave")) {
                 return new ReceivedLeaveNotification(parseIPPortField(receivedData), FileReaderWriter.getThisPeer(EUpdateFlag.DoNotUpdate));

src/main/java/vslab1/src/Sending/Data/PeerNotification.java

@@ -0,0 +1,54 @@
+package vslab1.src.Sending.Data;
+
+import java.util.Map;
+
+import vslab1.src.FileReaderWriter.FileReaderWriter;
+import vslab1.src.FileReaderWriter.FileReaderWriter.EUpdateFlag;
+import vslab1.src.Peers.Peer;
+
+/**
+ * Sent to peer that sent a join request to a friend in the network.
+ * The friend who received the join request, sends peerJoined to the
+ * other peers and they respond with this message, informing about their 
+ * presence and file list.
+ */ 
+public record PeerNotification(Peer sender, Peer receiver) implements Sendable {
+
+    @Override
+    public EDataType getType() {
+        return EDataType.PeerNotification;
+    }
+
+    @Override
+    public Peer getSender() {
+        return sender;
+    }
+
+    @Override
+    public Peer getReceiver() {
+        return receiver;
+    }
+
+    @Override
+    public byte[] getMessage() {
+        String fileList = "";
+        Map<String, String> files = FileReaderWriter.getThisPeer(EUpdateFlag.Update).filesMap();
+        for (Map.Entry<String, String> file : files.entrySet()) {
+            fileList += file.getKey() + ",";
+        }
+
+        // Remove last comma
+        fileList = fileList.substring(0, fileList.length() - 2);
+
+        String response = 
+            "{\"peer\":\"\"" +
+            "," + 
+            "\"ipPort\":\"" + sender.ipAddress() + ":" + sender.port() + "\"" +
+            "," +
+            "\"files\":[" +
+            fileList +
+            "]}";
+        return response.getBytes();
+    }
+    
+}