Added PeerJoined sendable and requestable.

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

@@ -0,0 +1,36 @@
+package vslab1.src.Request.Data;
+
+import vslab1.src.FileReaderWriter.FileReaderWriter;
+import vslab1.src.Peers.Peer;
+import vslab1.src.Sending.SendingQueue;
+import vslab1.src.Sending.Data.EDataType;
+import vslab1.src.Sending.Data.PeerNotification;
+
+/**
+ * Received peerJoined notification from friend of peer that joined. Updates information of received 
+ * new peer to online and triggers peer response to peer that joined.
+ */
+public record ReceivedPeerJoinedNotification(Peer sender, Peer receiver) implements Requestable {
+
+    @Override
+    public EDataType getType() {
+        return EDataType.PeerJoinedNotification;
+    }
+
+    @Override
+    public Peer getSender() {
+        return sender;
+    }
+
+    @Override
+    public Peer getReceiver() {
+        return receiver;
+    }
+
+    @Override
+    public void execute(SendingQueue sendingQueue) {
+        FileReaderWriter.updatePeer(sender);
+        sendingQueue.add(new PeerNotification(receiver, sender));
+    }
+    
+}

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

@@ -0,0 +1,35 @@
+package vslab1.src.Sending.Data;
+
+import vslab1.src.Peers.Peer;
+
+/**
+ * Sent by friend of peer which sent a join request to all peers in the network.
+ * Logic, that sent to all peers realized in ReceivedJoinRequest.
+ */
+public record PeerJoinedNotification(Peer sender, Peer receiver) implements Sendable {
+
+    @Override
+    public EDataType getType() {
+        return EDataType.PeerJoinedNotification;
+    }
+
+    @Override
+    public Peer getSender() {
+        return sender;
+    }
+
+    @Override
+    public Peer getReceiver() {
+        return receiver;
+    }
+
+    @Override
+    public byte[] getMessage() {
+        String request =
+            "{\"peerJoined\":\"\"" +
+            "," + 
+            "\"ipPort\":\"" + sender.ipAddress() + ":" + sender.port() + "\"}";
+        return request.getBytes(); 
+    }
+    
+}