Added JoinRequest sendable und requestable.

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

@@ -0,0 +1,41 @@
+package vslab1.src.Request.Data;
+
+import vslab1.src.FileReaderWriter.FileReaderWriter;
+import vslab1.src.FileReaderWriter.FileReaderWriter.EUpdateFlag;
+import vslab1.src.Peers.EOnlineState;
+import vslab1.src.Peers.Peer;
+import vslab1.src.Sending.SendingQueue;
+import vslab1.src.Sending.Data.EDataType;
+import vslab1.src.Sending.Data.PeerJoinedNotification;
+
+/**
+ * Received join request will trigger an update of peer that wants to join this 
+ * friends peer network and this friend will send peerJoined to each peer in the network.
+ */
+public record ReceivedJoinRequest(Peer sender, Peer receiver) implements Requestable {
+
+    @Override
+    public EDataType getType() {
+        return EDataType.JoinRequest;
+    }
+
+    @Override
+    public Peer getSender() {
+        return sender;
+    }
+
+    @Override
+    public Peer getReceiver() {
+        return receiver;
+    }
+
+    @Override
+    public void execute(SendingQueue sendingQueue) {
+        FileReaderWriter.updatePeer(new Peer(sender.ipAddress(), sender.port(), null, EOnlineState.Online));
+
+        FileReaderWriter.getPeers().forEach((peer) -> {
+            sendingQueue.add(new PeerJoinedNotification(peer, FileReaderWriter.getThisPeer(EUpdateFlag.DoNotUpdate)));
+        });
+    }
+    
+}

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

@@ -0,0 +1,30 @@
+package vslab1.src.Sending.Data;
+
+import vslab1.src.Peers.Peer;
+
+public record JoinRequest(Peer sender, Peer receiver) implements Sendable {
+
+    @Override
+    public EDataType getType() {
+        return EDataType.JoinRequest;
+    }
+
+    @Override
+    public Peer getSender() {
+        return sender;
+    }
+
+    @Override
+    public Peer getReceiver() {
+        return receiver;
+    }
+
+    @Override
+    public byte[] getMessage() {
+        String request =
+            "{\"join\":\"\"" +
+            "," + 
+            "\"ipPort\":\"" + sender.ipAddress() + ":" + sender.port() + "\"}";
+        return request.getBytes(); 
+    }
+}