Sync

* Completely revised communication between client and server.
* Added synchronization functionality.
* Added Message State updates
* Added UserStatus updates

.classpath

@@ -18,12 +18,6 @@
 			<attribute name="test" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
-		<attributes>
-			<attribute name="maven.pomderived" value="true"/>
-			<attribute name="test" value="true"/>
-		</attributes>
-	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>

src/main/java/envoy/client/Client.java

@@ -1,8 +1,6 @@
 package envoy.client;
 
 import java.time.Instant;
-import java.util.Arrays;
-
 import javax.ws.rs.client.ClientBuilder;
 import javax.ws.rs.client.Entity;
 import javax.ws.rs.client.WebTarget;
@@ -14,11 +12,10 @@ import javax.xml.datatype.DatatypeConfigurationException;
 import javax.xml.datatype.DatatypeFactory;
 
 import envoy.schema.Message;
-import envoy.schema.Message.MetaData.MessageState;
+import envoy.schema.Message.Metadata.MessageState;
-import envoy.schema.Messages;
 import envoy.schema.ObjectFactory;
+import envoy.schema.Sync;
 import envoy.schema.User;
-import envoy.schema.Users;
 
 /**
  * Project: <strong>envoy-client</strong><br>
@@ -38,6 +35,10 @@ public class Client {
 	private Config			config;
 	private User			sender, recipient;
 
+	private Sync	unreadMessagesSync	= objectFactory.createSync();
+	public Sync		sync				= objectFactory.createSync();
+	public Sync		readMessages		= objectFactory.createSync();
+
 	public Client(Config config, String username) {
 		this.config = config;
 		try {
@@ -46,43 +47,7 @@ public class Client {
 			e.printStackTrace();
 		}
 		sender = getUser(username);
-	}
+		System.out.println("ID: " + sender.getID());
-
-	/**
-	 * Sends a message with text content to the server.<br>
-	 * Because sending a request is a blocking operation, it is executed
-	 * asynchronously.
-	 * 
-	 * @param sender      name of the sender
-	 * @param recipient   name of the recipient
-	 * @param textContent content (text) of the message
-	 */
-	public void sendMessage(Message message) {
-		new Thread(() -> {
-			// Wrap single message into messages list
-			Messages messages = wrapMessages(message);
-
-			// Print message XML to console
-			JAXBContext jc;
-			try {
-				jc = JAXBContext.newInstance("envoy.schema");
-				Marshaller m = jc.createMarshaller();
-				m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
-				m.marshal(messages, System.out);
-			} catch (JAXBException e) {
-				e.printStackTrace();
-			}
-
-			// Send message
-			javax.ws.rs.client.Client	client	= ClientBuilder.newClient();
-			WebTarget					target	= client
-				.target(String.format("%s:%d/envoy-server/rest/message/send", config.getServer(), config.getPort()));
-
-			Response response = target.request().post(Entity.entity(messages, "application/xml"));
-			System.out.println("Response code: " + response.getStatus());
-			response.close();
-			client.close();
-		}).start();
 	}
 
 	/**
@@ -92,7 +57,7 @@ public class Client {
 	 * @return prepared {@link Message} object
 	 */
 	public Message createMessage(String textContent) {
-		Message.MetaData metaData = objectFactory.createMessageMetaData();
+		Message.Metadata metaData = objectFactory.createMessageMetadata();
 		metaData.setSender(sender.getID());
 		metaData.setRecipient(recipient.getID());
 		metaData.setState(MessageState.WAITING);
@@ -103,16 +68,33 @@ public class Client {
 		content.setText(textContent);
 
 		Message message = objectFactory.createMessage();
-		message.setMetaData(metaData);
+		message.setMetadata(metaData);
 		message.getContent().add(content);
 
 		return message;
 	}
 	
-	public Users getUsersListXml() { return get(String.format("%s:%d/envoy-server/rest/user", config.getServer(), config.getPort()), Users.class); }
+	/**
+	 * Returns a {@link Sync} with all users on the server.
+	 * @return Sync - List of all users on the server.
+	 * @since Envoy v0.1-alpha
+	 */
+	public Sync getUsersListXml() {
+		Sync	sendSync	= objectFactory.createSync();
+		User	user		= objectFactory.createUser();
+		user.setID(-1);
+		sendSync.getUsers().add(user);
+
+		javax.ws.rs.client.Client	client	= ClientBuilder.newClient();
+		WebTarget					target	= client.target(String
+			.format("%s:%d/envoy-server/rest/sync/syncData?userId=%d", config.getServer(), config.getPort(), 0));
+
+		Response	response		= target.request().post(Entity.entity(sendSync, "application/xml"));
+		Sync		returnSendSync	= response.readEntity(Sync.class);
+		response.close();
+		client.close();
+		return returnSendSync;
 
-	public Messages getUnreadMessages(long userId) {
-		return get(String.format("%s:%d/envoy-server/rest/message/receive?userId=%d", config.getServer(), config.getPort(), userId), Messages.class);
 	}
 
 	/**
@@ -123,52 +105,358 @@ public class Client {
 	 * @since Envoy v0.1-alpha
 	 */
 	private User getUser(String name) {
-		return get(String.format("%s:%d/envoy-server/rest/user/sender?name=%s", config.getServer(), config.getPort(), name), Users.class).getUser()
+		Sync	senderSync	= objectFactory.createSync();
-			.get(0);
+		User	user		= objectFactory.createUser();
-	}
+		user.setName(name);
+		senderSync.getUsers().add(user);
 
-	/**
+		javax.ws.rs.client.Client	client	= ClientBuilder.newClient();
-	 * Invokes the GET method of a web service.
+		WebTarget					target	= client.target(String
-	 * 
+			.format("%s:%d/envoy-server/rest/sync/syncData?userId=%d", config.getServer(), config.getPort(), 0));
-	 * @param <T>           the type of the object returned by the web service
+
-	 * @param uri           the URI of the web service
+		Response	response			= target.request().post(Entity.entity(senderSync, "application/xml"));
-	 * @param responseClass the class of the object returned by the web service
+		User		returnSender		= objectFactory.createUser();
-	 * @return the object returned by the web service
+		Sync		returnSenderSync	= response.readEntity(Sync.class);
-	 * @since Envoy v0.1-alpha
+		if (returnSenderSync.getUsers().size() == 1) {
-	 */
+			returnSender = returnSenderSync.getUsers().get(0);
-	private <T> T get(String uri, Class<T> responseClass) {
+		} else {
-		javax.ws.rs.client.Client	client			= ClientBuilder.newClient();
+			System.out.println("ERROR exiting...");
-		WebTarget					target			= client.target(uri);
+		}
-		Response					response		= target.request("application/xml").get();
-		T							responseObject	= response.readEntity(responseClass);
-		System.out.println("Response code: " + response.getStatus());
 		response.close();
 		client.close();
-		return responseObject;
+		return returnSender;
 	}
 
 	/**
-	 * Wraps one or more {@link Message} objects into a {@link Messages} object.
+	 * Sends the "sync" Sync Object to the server and gets a "returnSync" Sync
+	 * Object as response. <br>
+	 * It is also used to get the own sender at the start of the client 
+	 * (Client sends "sync" Sync Object with single user in it(name: the name entered at login, id: 0, UserStatus:null))<br>
+	 *  and to get a complete list of all users saved on the server. 
+	 * (Client sends "sync" Sync Object with single user in it(name: "" (empty), id: -1, UserStatus:null)) <br>
+	 * This method also processes the response Sync Object. <br>
+	 * It sorts its users and messages by specific variables and does certain things
+	 * with them. <br>
+	 * <br>
+	 * Messages: <br>
+	 * -State SENT: 					Update Local message(s) with State WAITING (add Message ID and
+	 * 									change State to SENT). (server sends these informations to the client if
+	 * 									message(s) with State WAITING were successfully sent to the server)<br>
+	 * -State RECEIVED, SenderID != 0: 	Adds the unread Messages returned from the
+	 * 									server in the latest sync to the "unreadMessagesSync" Sync Object. <br>
+	 * -State RECEIVED, SenderID == 0: 	Update message(s) in localDB to state RECEIVED.
+	 * 									(server sends these informations to the client if the other client received
+	 * 									the message(s).) <br>
+	 * -State READ:						Update message(s) in the LocalDB to state READ. (server sends these informations to the client if the other client read
+	 * 									the message(s).) <br>
+	 * <br>
+	 * Users: <br>
+	 * Updating UserStatus of all users in LocalDB. (Server sends all users with their updated UserStatus to the client.) <br>						
 	 * 
-	 * @param messages the {@link Message} objects to wrap
+	 * @param userId
-	 * @return {@link Messages} object with all messages as its children
+	 * @param localDB
 	 * @since Envoy v0.1-alpha
 	 */
-	private Messages wrapMessages(Message... messages) {
+	public void sendSync(long userId, LocalDB localDB) {
-		Messages wrapper = objectFactory.createMessages();
+		new Thread(() -> {
-		wrapper.getMessage().addAll(Arrays.asList(messages));
+			// Print sync XML to console
-		return wrapper;
+			JAXBContext jc;
+			try {
+				jc = JAXBContext.newInstance("envoy.schema");
+				Marshaller m = jc.createMarshaller();
+				m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
+				m.marshal(sync, System.out);
+			} catch (JAXBException e) {
+				e.printStackTrace();
+			}
+			addWaitingMessagesToSync(localDB);
+
+			getSentStateMessagesFromLocalDB(localDB);
+			for (int i = 0; i < readMessages.getMessages().size(); i++) {
+				sync.getMessages().add(readMessages.getMessages().get(i));
+			}
+			readMessages.getMessages().clear();
+
+			// Send sync
+			javax.ws.rs.client.Client	client	= ClientBuilder.newClient();
+			WebTarget					target	= client
+				.target(String.format("%s:%d/envoy-server/rest/sync/syncData?userId=%d",
+						config.getServer(),
+						config.getPort(),
+						userId));
+
+			Response response = target.request().post(Entity.entity(sync, "application/xml"));
+
+			Sync returnSync = response.readEntity(Sync.class);
+			if (returnSync.getMessages().size() != 0) {
+				System.out.println("Message ID: " + returnSync.getMessages().get(0).getMetadata().getMessageId());
+			}
+
+			for (int i = 0; i < returnSync.getMessages().size(); i++) {
+
+				// Print sync XML to console
+				JAXBContext jc2;
+				try {
+					jc2 = JAXBContext.newInstance("envoy.schema");
+					Marshaller m = jc2.createMarshaller();
+					m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
+					m.marshal(returnSync, System.out);
+				} catch (JAXBException e) {
+					e.printStackTrace();
+				}
+
+				if (returnSync.getMessages().get(i).getMetadata().getMessageId() != 0
+						&& returnSync.getMessages().get(i).getMetadata().getState() == MessageState.SENT) {
+					// Update Local Messages with State WAITING (add Message ID and change State to
+					// SENT)
+					for (int j = 0; j < sync.getMessages().size(); j++) {
+						if (j == i) {
+							sync.getMessages()
+								.get(j)
+								.getMetadata()
+								.setMessageId(returnSync.getMessages().get(j).getMetadata().getMessageId());
+							sync.getMessages()
+								.get(j)
+								.getMetadata()
+								.setState(returnSync.getMessages().get(j).getMetadata().getState());
+						}
+
+					}
+
+				}
+				if (returnSync.getMessages().get(i).getMetadata().getMessageId() != 0
+						&& returnSync.getMessages().get(i).getMetadata().getSender() != 0
+						&& returnSync.getMessages().get(i).getMetadata().getState() == MessageState.RECEIVED) {
+					// these are the unread Messages from the server
+					unreadMessagesSync.getMessages().add(returnSync.getMessages().get(i));
+
+				}
+
+				if (returnSync.getMessages().get(i).getMetadata().getMessageId() != 0
+						&& returnSync.getMessages().get(i).getMetadata().getSender() == 0
+						&& returnSync.getMessages().get(i).getMetadata().getState() == MessageState.RECEIVED) {
+					// Update Messages in localDB to state RECEIVED
+					for (int j = 0; j < localDB.getChats().size(); j++) {
+						if (localDB.getChats().get(j).getRecipient().getID() == returnSync.getMessages()
+							.get(i)
+							.getMetadata()
+							.getRecipient()) {
+							for (int k = 0; k < localDB.getChats().get(j).getModel().getSize(); k++) {
+								if (localDB.getChats()
+									.get(j)
+									.getModel()
+									.get(k)
+									.getMetadata()
+									.getMessageId() == returnSync.getMessages().get(i).getMetadata().getMessageId()) {
+									// Update Message in LocalDB
+									localDB.getChats()
+										.get(j)
+										.getModel()
+										.get(k)
+										.getMetadata()
+										.setState(returnSync.getMessages().get(j).getMetadata().getState());
+								}
+							}
+						}
+					}
+
+				}
+
+				if (returnSync.getMessages().get(i).getMetadata().getMessageId() != 0
+						&& returnSync.getMessages().get(i).getMetadata().getState() == MessageState.READ) {
+					// Update local Messages to state READ
+					System.out
+						.println("Message with ID: " + returnSync.getMessages().get(i).getMetadata().getMessageId()
+								+ "was initialized to be set to READ in localDB.");
+					for (int j = 0; j < localDB.getChats().size(); j++) {
+						if (localDB.getChats().get(j).getRecipient().getID() == returnSync.getMessages()
+							.get(i)
+							.getMetadata()
+							.getRecipient()) {
+							System.out.println(
+									"Chat with: " + localDB.getChats().get(j).getRecipient().getID() + "was selected.");
+							for (int k = 0; k < localDB.getChats().get(j).getModel().getSize(); k++) {
+								if (localDB.getChats()
+									.get(j)
+									.getModel()
+									.get(k)
+									.getMetadata()
+									.getMessageId() == returnSync.getMessages().get(i).getMetadata().getMessageId()) {
+									System.out.println("Message with ID: "
+											+ localDB.getChats().get(j).getModel().get(k).getMetadata().getMessageId()
+											+ "was selected.");
+									localDB.getChats()
+										.get(j)
+										.getModel()
+										.get(k)
+										.getMetadata()
+										.setState(returnSync.getMessages().get(i).getMetadata().getState());
+									System.out.println("Message State is now: " + localDB.getChats()
+										.get(j)
+										.getModel()
+										.get(k)
+										.getMetadata()
+										.getState()
+										.toString());
+								}
+							}
+						}
+					}
+
+				}
+			}
+
+			// Updating UserStatus of all Users in LocalDB
+			for (int j = 0; j < returnSync.getUsers().size(); j++) {
+				for (int k = 0; k < localDB.getChats().size(); k++) {
+					if (localDB.getChats().get(k).getRecipient().getID() == returnSync.getUsers().get(j).getID()) {
+
+						localDB.getChats().get(k).getRecipient().setStatus(returnSync.getUsers().get(j).getStatus());
+						System.out.println(localDB.getChats().get(k).getRecipient().getStatus().toString());
+					}
+				}
+			}
+
+			System.out.println("Response code: " + response.getStatus());
+
+			response.close();
+			client.close();
+			sync.getMessages().clear();
+			sync.getUsers().clear();
+
+		}).start();
+		System.out.println(sync.getMessages().size());
+
 	}
 
 	/**
-	 * @return the sender object that represents this client
+	 * Adds a message to the "sync" Sync object.
+	 * 
+	 * @param message
+	 * @since Envoy v0.1-alpha
+	 */
+	public void addMessageToSync(Message message) { sync.getMessages().add(message); }
+
+	/**
+	 * Adds a user to the "sync" Sync object.
+	 * 
+	 * @param user
+	 * @since Envoy v0.1-alpha
+	 */
+	public void addUserToSync(User user) { sync.getUsers().add(user); }
+
+	/**
+	 * Adds the unread Messages returned from the server in the latest sync to the
+	 * right chats in the LocalDB.
+	 * 
+	 * @param localDB
+	 * @since Envoy v0.1-alpha
+	 */
+	public void addUnreadMessagesToLocalDB(LocalDB localDB) {
+		Sync unreadMessages = unreadMessagesSync;
+		for (int i = 0; i < unreadMessages.getMessages().size(); i++)
+			for (int j = 0; j < localDB.getChats().size(); j++)
+				if (localDB.getChats().get(j).getRecipient().getID() == unreadMessages.getMessages()
+					.get(i)
+					.getMetadata()
+					.getSender()) {
+					localDB.getChats().get(j).appendMessage(unreadMessages.getMessages().get(i));
+				}
+	}
+
+	/**
+	 * Gets all Messages with state SENT from the LocalDB and adds them to the
+	 * "sync" Sync object.
+	 * 
+	 * @param localDB
+	 * @since Envoy v0.1-alpha
+	 */
+	public void getSentStateMessagesFromLocalDB(LocalDB localDB) {
+		for (int i = 0; i < localDB.getChats().size(); i++) {
+			for (int j = 0; j < localDB.getChats().get(i).getModel().getSize(); j++) {
+				if (localDB.getChats().get(i).getModel().get(j).getMetadata().getState() == MessageState.SENT) {
+					addMessageToSync(localDB.getChats().get(i).getModel().get(j));
+				}
+			}
+		}
+	}
+
+	/**
+	 * Changes all Messages with State RECEIVED of a specific chat to State READ.
+	 * <br>
+	 * Adds these Messages to the "readMessages" Sync object.
+	 * 
+	 * @param currentChat
+	 * @since Envoy v0.1-alpha
+	 */
+	public void setMessagesToRead(Chat currentChat) {
+		for (int j = 0; j < currentChat.getModel().getSize(); j++) {
+			if (currentChat.getModel().get(j).getMetadata().getRecipient() != currentChat.getRecipient().getID()) {
+				if (currentChat.getModel().get(j).getMetadata().getState() == MessageState.RECEIVED) {
+					currentChat.getModel().get(j).getMetadata().setState(MessageState.READ);
+					readMessages.getMessages().add(currentChat.getModel().get(j));
+				}
+			}
+		}
+	}
+
+	/**
+	 * Adds a Message with State WAITING to a specific chat in the LocalDB.
+	 * 
+	 * @param message
+	 * @param currentChat
+	 * @since Envoy v0.1-alpha
+	 */
+	public void addWaitingMessageToLocalDB(Message message, Chat currentChat) { currentChat.appendMessage(message); }
+
+	/**
+	 * Adds all Messages with State WAITING from the LocalDB to the Sync.
+	 * 
+	 * @param localDB
+	 * @since Envoy v0.1-alpha
+	 */
+	public void addWaitingMessagesToSync(LocalDB localDB) {
+		for (int i = 0; i < localDB.getChats().size(); i++) {
+			for (int j = 0; j < localDB.getChats().get(i).getModel().getSize(); j++) {
+				if (localDB.getChats().get(i).getModel().get(j).getMetadata().getState() == MessageState.WAITING) {
+					// addMessageToSync(localDB.getChats().get(i).getModel().get(j));
+					System.out.println("Got Waiting Message");
+					sync.getMessages().add(0, localDB.getChats().get(i).getModel().get(j));
+				}
+			}
+		}
+	}
+
+	/**
+	 * @return the sender object that represents this client.
 	 * @since Envoy v0.1-alpha
 	 */
 	public User getSender() { return sender; }
 
+	/**
+	 * @return the current recipient of the current chat.
+	 * @since Envoy v0.1-alpha
+	 */
 	public User getRecipient() { return recipient; }
 
+	/**
+	 * Sets the recipient.
+	 * 
+	 * @param recipient
+	 * @since Envoy v0.1-alpha
+	 */
 	public void setRecipient(User recipient) { this.recipient = recipient; }
 
+	/**
+	 * @return boolean weather the recipient is currently set.
+	 * @since Envoy v0.1-alpha
+	 */
 	public boolean hasRecipient() { return recipient != null; }
+
+	/**
+	 * Clears the "unreadMessagesSync" Sync object.
+	 * 
+	 * @since Envoy v0.1-alpha
+	 */
+	public void clearUnreadMessagesSync() { unreadMessagesSync.getMessages().clear(); }
 }

src/main/java/envoy/client/ui/ChatWindow.java

@@ -27,9 +27,9 @@ import envoy.client.Chat;
 import envoy.client.Client;
 import envoy.client.LocalDB;
 import envoy.schema.Message;
-import envoy.schema.Messages;
+import envoy.schema.Sync;
 import envoy.schema.User;
-import envoy.schema.Users;
+
 
 /**
  * Project: <strong>envoy-client</strong><br>
@@ -147,18 +147,17 @@ public class ChatWindow extends JFrame {
 
 		postButton.addActionListener((evt) -> {
 			if (!client.hasRecipient()) {
-				JOptionPane.showMessageDialog(this, "Please select a recipient!", "Cannot send message", JOptionPane.INFORMATION_MESSAGE);
+				JOptionPane.showMessageDialog(this,
-				return;
+						"Please select a recipient!",
+						"Cannot send message",
+						JOptionPane.INFORMATION_MESSAGE);
 			}
 
 			if (!messageEnterTextfield.getText().isEmpty()) try {
 
 				// Create and send message object
 				final Message message = client.createMessage(messageEnterTextfield.getText());
-				client.sendMessage(message);
+				client.addWaitingMessageToLocalDB(message, currentChat);
-
-				// Append message object to chat
-				currentChat.appendMessage(message);
 				messageList.setModel(currentChat.getModel());
 
 				// Clear text field
@@ -200,16 +199,23 @@ public class ChatWindow extends JFrame {
 				final User			user				= selectedUserList.getSelectedValue();
 				client.setRecipient(user);
 
-				currentChat = localDB.getChats().stream().filter(chat -> chat.getRecipient().getID() == user.getID()).findFirst().get();
+				currentChat = localDB.getChats()
+					.stream()
+					.filter(chat -> chat.getRecipient().getID() == user.getID())
+					.findFirst()
+					.get();
 
 				client.setRecipient(user);
 
 				textPane.setText(currentChat.getRecipient().getName());
+				
 				messageList.setModel(currentChat.getModel());
 				contentPane.revalidate();
 			}
 		});
 		
+		
+		
 		userList.setSelectionForeground(new Color(255, 255, 255));
 		userList.setSelectionBackground(new Color(102, 0, 153));
 		userList.setForeground(new Color(255, 255, 255));
@@ -227,6 +233,7 @@ public class ChatWindow extends JFrame {
 		contentPane.add(userList, gbc_userList);
 		contentPane.revalidate();
 
+		
 		loadUsersAndChats();
 		startReceiverThread(5000);
 
@@ -239,9 +246,9 @@ public class ChatWindow extends JFrame {
 	 */
 	private void loadUsersAndChats() {
 		new Thread(() -> {
-			Users					users			= client.getUsersListXml();
+			Sync					users			= client.getUsersListXml();
 			DefaultListModel<User>	userListModel	= new DefaultListModel<>();
-			users.getUser().forEach(user -> {
+			users.getUsers().forEach(user -> {
 				userListModel.addElement(user);
 
 				// Check if user exists in local DB
@@ -253,18 +260,34 @@ public class ChatWindow extends JFrame {
 	}
 
 	/**
-	 * Checks for new messages and adds them to the chat list.
+	 * For detailed information see Javadoc of corresponding methods.
 	 * 
 	 * @param timeout the amount of time that passes between two requests sent to
 	 *                the server
+	 * @since Envoy v0.1-alpha
 	 */
 	private void startReceiverThread(int timeout) {
 		new Timer(timeout, (evt) -> {
-			Messages unreadMessages = client.getUnreadMessages(client.getSender().getID());
+			if(currentChat != null) {
-			for (int i = 0; i < unreadMessages.getMessage().size(); i++)
+				client.setMessagesToRead(currentChat);
-				for (int j = 0; j < localDB.getChats().size(); j++)
+			}
-					if (localDB.getChats().get(j).getRecipient().getID() == unreadMessages.getMessage().get(i).getMetaData().getSender())
+			client.sendSync(client.getSender().getID(), localDB);
-						localDB.getChats().get(j).appendMessage(unreadMessages.getMessage().get(i));
+			client.addUnreadMessagesToLocalDB(localDB);
-		}).start();
+			client.clearUnreadMessagesSync();
+			
+			for (int i = 0; i < userList.getModel().getSize(); i++) {
+				for (int j = 0; j < localDB.getChats().size(); j++) {
+					if(userList.getModel().getElementAt(i).getID() == localDB.getChats().get(j).getRecipient().getID()) {
+						userList.getModel().getElementAt(i).setStatus(localDB.getChats().get(j).getRecipient().getStatus());
+					}
+				}
+				
+			}
+			
+			contentPane.revalidate();
+			contentPane.repaint();
+			userList.revalidate();
+			userList.repaint();
+			}).start();
 	}
 }

src/main/java/envoy/client/ui/MessageListRenderer.java

@@ -18,6 +18,7 @@ import envoy.schema.Message;
  * Created: <strong>19 Oct 2019</strong><br>
  * 
  * @author Kai S. K. Engelbart
+ * @author Maximilian K&auml;fer
  * @since Envoy v0.1-alpha
  */
 public class MessageListRenderer extends JLabel implements ListCellRenderer<Message> {
@@ -38,14 +39,16 @@ public class MessageListRenderer extends JLabel implements ListCellRenderer<Mess
 		setOpaque(true);
 
 		final String	text	= value.getContent().get(0).getText();
-		final String	date	= value.getMetaData().getDate() == null ? ""
+		final String 	state 	= value.getMetadata().getState().toString();
+		final String	date	= value.getMetadata().getDate() == null ? ""
 				: new SimpleDateFormat("dd.MM.yyyy hh:mm ")
-					.format(value.getMetaData().getDate().toGregorianCalendar().getTime());
+					.format(value.getMetadata().getDate().toGregorianCalendar().getTime());
 
 		setText(String.format(
-				"<html><p style=\"color:#d2d235\"><b><small>%s</b></small><br><p style=\"color:white\">%s</html>",
+				"<html><p style=\"color:#d2d235\"><b><small>%s</b></small><br><p style=\"color:white\">%s :%s</html>",
 				date,
-				text));
+				text,
+				state));
 		return this;
 	}
 }

src/main/java/envoy/client/ui/UserListRenderer.java

@@ -7,6 +7,7 @@ import javax.swing.JList;
 import javax.swing.ListCellRenderer;
 
 import envoy.schema.User;
+import envoy.schema.User.UserStatus;
 
 /**
  * Defines how the {@code UserList} is displayed.
@@ -16,6 +17,7 @@ import envoy.schema.User;
  * Created: <strong>12 Oct 2019</strong><br>
  * 
  * @author Kai S. K. Engelbart
+ * @author Maximilian K&auml;fer
  * @since Envoy v0.1-alpha
  */
 public class UserListRenderer extends JLabel implements ListCellRenderer<User> {
@@ -36,8 +38,27 @@ public class UserListRenderer extends JLabel implements ListCellRenderer<User> {
 		// Enable background rendering
 		setOpaque(true);
 
-		setText(value.getName());
+
-		setFont(list.getFont());
+		final String		name	= value.getName();
+		final UserStatus	status	= value.getStatus();
+		
+		switch (status) {
+			case ONLINE:
+				setText(String.format(
+						"<html><p style=\"color:#03fc20\"><b><small>%s</b></small><br><p style=\"color:white\">%s</html>",
+						status,
+						name));
+				break;
+
+			case OFFLINE:
+				setText(String.format(
+						"<html><p style=\"color:#fc0303\"><b><small>%s</b></small><br><p style=\"color:white\">%s</html>",
+						status,
+						name));
+				break;
+		}
+
+		
 
 		return this;
 	}