Merge branch 'develop' into f/password_in_login_credentials

pom.xml

@@ -28,7 +28,7 @@
 		<dependency>
 			<groupId>com.github.informatik-ag-ngl</groupId>
 			<artifactId>envoy-common</artifactId>
-			<version>f~password_in_login_credentials-SNAPSHOT</version>
+			<version>develop-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>org.openjfx</groupId>

src/main/java/envoy/client/data/Cache.java

@@ -20,7 +20,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public class Cache<T> implements Consumer<T>, Serializable {
+public final class Cache<T> implements Consumer<T>, Serializable {
 
 	private final Queue<T>			elements	= new LinkedList<>();
 	private transient Consumer<T>	processor;

src/main/java/envoy/client/data/CacheMap.java

@@ -0,0 +1,66 @@
+package envoy.client.data;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Stores a heterogeneous map of {@link Cache} objects with different type
+ * parameters.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>CacheMap.java</strong><br>
+ * Created: <strong>09.07.2020</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy Client v0.1-beta
+ */
+public final class CacheMap implements Serializable {
+
+	private final Map<Class<?>, Cache<?>> map = new HashMap<>();
+
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * Adds a cache to the map.
+	 * 
+	 * @param <T>   the type accepted by the cache
+	 * @param key   the class that maps to the cache
+	 * @param cache the cache to store
+	 * @since Envoy Client v0.1-beta
+	 */
+	public <T> void put(Class<T> key, Cache<T> cache) { map.put(key, cache); }
+
+	/**
+	 * Returns a cache mapped by a class.
+	 * 
+	 * @param <T> the type accepted by the cache
+	 * @param key the class that maps to the cache
+	 * @return the cache
+	 * @since Envoy Client v0.1-beta
+	 */
+	public <T> Cache<T> get(Class<T> key) { return (Cache<T>) map.get(key); }
+
+	/**
+	 * Returns a cache mapped by a class or any of its subclasses.
+	 * 
+	 * @param <T> the type accepted by the cache
+	 * @param key the class that maps to the cache
+	 * @return the cache
+	 * @since Envoy Client v0.1-beta
+	 */
+	public <T> Cache<? super T> getApplicable(Class<T> key) {
+		Cache<? super T> cache = get(key);
+		if (cache == null)
+			for (var e : map.entrySet())
+				if (e.getKey().isAssignableFrom(key))
+					cache = (Cache<? super T>) e.getValue();
+		return cache;
+	}
+
+	/**
+	 * @return the map in which the caches are stored
+	 * @since Envoy Client v0.1-beta
+	 */
+	public Map<Class<?>, Cache<?>> getMap() { return map; }
+}

src/main/java/envoy/client/data/LocalDB.java

@@ -24,8 +24,12 @@ public abstract class LocalDB {
 	protected Map<String, Contact>	users		= new HashMap<>();
 	protected List<Chat>			chats		= new ArrayList<>();
 	protected IDGenerator			idGenerator;
-	protected Cache<Message>				messageCache	= new Cache<>();
+	protected CacheMap				cacheMap	= new CacheMap();
-	protected Cache<MessageStatusChange>	statusCache		= new Cache<>();
+
+	{
+		cacheMap.put(Message.class, new Cache<>());
+		cacheMap.put(MessageStatusChange.class, new Cache<>());
+	}
 
 	/**
 	 * Initializes a storage space for a user-specific list of chats.
@@ -139,28 +143,10 @@ public abstract class LocalDB {
 	public boolean hasIDGenerator() { return idGenerator != null; }
 
 	/**
-	 * @return the offline message cache
+	 * @return the cache map for messages and message status changes
-	 * @since Envoy Client v0.3-alpha
+	 * @since Envoy Client v0.1-beta
 	 */
-	public Cache<Message> getMessageCache() { return messageCache; }
+	public CacheMap getCacheMap() { return cacheMap; }
-
-	/**
-	 * @param messageCache the offline message cache to set
-	 * @since Envoy Client v0.3-alpha
-	 */
-	public void setMessageCache(Cache<Message> messageCache) { this.messageCache = messageCache; }
-
-	/**
-	 * @return the offline status cache
-	 * @since Envoy Client v0.3-alpha
-	 */
-	public Cache<MessageStatusChange> getStatusCache() { return statusCache; }
-
-	/**
-	 * @param statusCache the offline status cache to set
-	 * @since Envoy Client v0.3-alpha
-	 */
-	public void setStatusCache(Cache<MessageStatusChange> statusCache) { this.statusCache = statusCache; }
 
 	/**
 	 * Searches for a message by ID.

src/main/java/envoy/client/data/PersistentLocalDB.java

@@ -5,8 +5,6 @@ import java.util.ArrayList;
 import java.util.HashMap;
 
 import envoy.data.IDGenerator;
-import envoy.data.Message;
-import envoy.event.MessageStatusChange;
 import envoy.util.SerializationUtils;
 
 /**
@@ -64,7 +62,7 @@ public final class PersistentLocalDB extends LocalDB {
 		SerializationUtils.write(usersFile, users);
 
 		// Save user data
-		if (user != null) SerializationUtils.write(userFile, chats, messageCache, statusCache);
+		if (user != null) SerializationUtils.write(userFile, chats, cacheMap);
 
 		// Save id generator
 		if (hasIDGenerator()) SerializationUtils.write(idGeneratorFile, idGenerator);
@@ -77,8 +75,7 @@ public final class PersistentLocalDB extends LocalDB {
 	public void loadUserData() throws ClassNotFoundException, IOException {
 		try (var in = new ObjectInputStream(new FileInputStream(userFile))) {
 			chats		= (ArrayList<Chat>) in.readObject();
-			messageCache	= (Cache<Message>) in.readObject();
+			cacheMap	= (CacheMap) in.readObject();
-			statusCache		= (Cache<MessageStatusChange>) in.readObject();
 		}
 	}
 

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

@@ -7,9 +7,7 @@ import java.util.concurrent.TimeoutException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import envoy.client.data.Cache;
+import envoy.client.data.*;
-import envoy.client.data.ClientConfig;
-import envoy.client.data.LocalDB;
 import envoy.client.event.SendEvent;
 import envoy.data.*;
 import envoy.event.*;
@@ -53,34 +51,14 @@ public class Client implements Closeable {
 	 * will block for up to 5 seconds. If the handshake does exceed this time limit,
 	 * an exception is thrown.
 	 *
-	 * @param credentials                           the login credentials of the
+	 * @param credentials the login credentials of the user
-	 *                                              user
+	 * @param cacheMap    the map of all caches needed
-	 * @param receivedMessageCache                  a message cache containing all
-	 *                                              unread messages from the server
-	 *                                              that can be relayed after
-	 *                                              initialization
-	 * @param receivedGroupMessageCache             a groupMessage cache containing
-	 *                                              all unread groupMessages from
-	 *                                              the server that can be relayed
-	 *                                              after initialization
-	 * @param receivedMessageStatusChangeCache      an event cache containing all
-	 *                                              received
-	 *                                              messageStatusChangeEvents from
-	 *                                              the server that can be relayed
-	 *                                              after initialization
-	 * @param receivedGroupMessageStatusChangeCache an event cache containing all
-	 *                                              received
-	 *                                              groupMessageStatusChangeEvents
-	 *                                              from the server that can be
-	 *                                              relayed after initialization
 	 * @throws TimeoutException     if the server could not be reached
 	 * @throws IOException          if the login credentials could not be written
 	 * @throws InterruptedException if the current thread is interrupted while
 	 *                              waiting for the handshake response
 	 */
-	public void performHandshake(LoginCredentials credentials, Cache<Message> receivedMessageCache, Cache<GroupMessage> receivedGroupMessageCache,
+	public void performHandshake(LoginCredentials credentials, CacheMap cacheMap) throws TimeoutException, IOException, InterruptedException {
-			Cache<MessageStatusChange> receivedMessageStatusChangeCache, Cache<GroupMessageStatusChange> receivedGroupMessageStatusChangeCache)
-			throws TimeoutException, IOException, InterruptedException {
 		if (online) throw new IllegalStateException("Handshake has already been performed successfully");
 
 		// Establish TCP connection
@@ -93,10 +71,7 @@ public class Client implements Closeable {
 
 		// Register user creation processor, contact list processor and message cache
 		receiver.registerProcessor(User.class, sender -> this.sender = sender);
-		receiver.registerProcessor(Message.class, receivedMessageCache);
+		receiver.registerProcessors(cacheMap.getMap());
-		receiver.registerProcessor(GroupMessage.class, receivedGroupMessageCache);
-		receiver.registerProcessor(MessageStatusChange.class, receivedMessageStatusChangeCache);
-		receiver.registerProcessor(GroupMessageStatusChange.class, receivedGroupMessageStatusChangeCache);
 		receiver.registerProcessor(HandshakeRejection.class, evt -> { rejected = true; eventBus.dispatch(evt); });
 
 		rejected = false;
@@ -125,9 +100,6 @@ public class Client implements Closeable {
 
 		online = true;
 
-		// Remove all processors as they are only used during the handshake
-		receiver.removeAllProcessors();
-
 		logger.log(Level.INFO, "Handshake completed.");
 	}
 
@@ -135,65 +107,35 @@ public class Client implements Closeable {
 	 * Initializes the {@link Receiver} used to process data sent from the server to
 	 * this client.
 	 *
-	 * @param localDB                               the local database used to
+	 * @param localDB  the local database used to persist the current
-	 *                                              persist
-	 *                                              the current
 	 *                 {@link IDGenerator}
-	 * @param receivedMessageCache                  a message cache containing all
+	 * @param cacheMap the map of all caches needed
-	 *                                              unread
-	 *                                              messages
-	 *                                              from the server that can be
-	 *                                              relayed
-	 *                                              after
-	 *                                              initialization
-	 * @param receivedGroupMessageCache             a groupMessage cache containing
-	 *                                              all
-	 *                                              unread
-	 *                                              groupMessages
-	 *                                              from the server that can be
-	 *                                              relayed
-	 *                                              after
-	 *                                              initialization
-	 * @param receivedMessageStatusChangeCache      an event cache containing all
-	 *                                              received
-	 *                                              messageStatusChangeEvents
-	 *                                              from the server that can be
-	 *                                              relayed
-	 *                                              after initialization
-	 * @param receivedGroupMessageStatusChangeCache an event cache containing all
-	 *                                              received
-	 *                                              groupMessageStatusChangeEvents
-	 *                                              from the server that can be
-	 *                                              relayed after initialization
 	 * @throws IOException if no {@link IDGenerator} is present and none could be
 	 *                     requested from the server
 	 * @since Envoy Client v0.2-alpha
 	 */
-	public void initReceiver(LocalDB localDB, Cache<Message> receivedMessageCache, Cache<GroupMessage> receivedGroupMessageCache,
+	public void initReceiver(LocalDB localDB, CacheMap cacheMap) throws IOException {
-			Cache<MessageStatusChange> receivedMessageStatusChangeCache, Cache<GroupMessageStatusChange> receivedGroupMessageStatusChangeCache)
-			throws IOException {
 		checkOnline();
 
+		// Remove all processors as they are only used during the handshake
+		receiver.removeAllProcessors();
+
 		// Process incoming messages
-		final ReceivedMessageProcessor			receivedMessageProcessor			= new ReceivedMessageProcessor();
+		final var	receivedMessageProcessor			= new ReceivedMessageProcessor();
-		final ReceivedGroupMessageProcessor		receivedGroupMessageProcessor		= new ReceivedGroupMessageProcessor();
+		final var	receivedGroupMessageProcessor		= new ReceivedGroupMessageProcessor();
-		final MessageStatusChangeProcessor		messageStatusChangeProcessor		= new MessageStatusChangeProcessor();
+		final var	messageStatusChangeProcessor		= new MessageStatusChangeProcessor();
-		final GroupMessageStatusChangeProcessor	groupMessageStatusChangeProcessor	= new GroupMessageStatusChangeProcessor();
+		final var	groupMessageStatusChangeProcessor	= new GroupMessageStatusChangeProcessor();
 
 		receiver.registerProcessor(GroupMessage.class, receivedGroupMessageProcessor);
-
 		receiver.registerProcessor(Message.class, receivedMessageProcessor);
-
 		receiver.registerProcessor(MessageStatusChange.class, messageStatusChangeProcessor);
-
 		receiver.registerProcessor(GroupMessageStatusChange.class, groupMessageStatusChangeProcessor);
-		// Relay cached unread messages and unread groupMessages
-		receivedMessageCache.setProcessor(receivedMessageProcessor);
-		receivedGroupMessageCache.setProcessor(receivedGroupMessageProcessor);
 
-		// Process message status changes
+		// Relay cached messages and message status changes
-		receivedMessageStatusChangeCache.setProcessor(messageStatusChangeProcessor);
+		cacheMap.get(Message.class).setProcessor(receivedMessageProcessor);
-		receivedGroupMessageStatusChangeCache.setProcessor(groupMessageStatusChangeProcessor);
+		cacheMap.get(GroupMessage.class).setProcessor(receivedGroupMessageProcessor);
+		cacheMap.get(MessageStatusChange.class).setProcessor(messageStatusChangeProcessor);
+		cacheMap.get(GroupMessageStatusChange.class).setProcessor(groupMessageStatusChangeProcessor);
 
 		// Process user status changes
 		receiver.registerProcessor(UserStatusChange.class, eventBus::dispatch);
@@ -224,18 +166,10 @@ public class Client implements Closeable {
 
 		// Request a generator if none is present or the existing one is consumed
 		if (!localDB.hasIDGenerator() || !localDB.getIDGenerator().hasNext()) requestIdGenerator();
-	}
 
-	/**
+		// Relay caches
-	 * Creates a new write proxy that uses this client to communicate with the
+		cacheMap.getMap().values().forEach(Cache::relay);
-	 * server.
+	}
-	 *
-	 * @param localDB the local database that the write proxy will use to access
-	 *                caches
-	 * @return a new write proxy
-	 * @since Envoy Client v0.3-alpha
-	 */
-	public WriteProxy createWriteProxy(LocalDB localDB) { return new WriteProxy(this, localDB); }
 
 	/**
 	 * Sends a message to the server. The message's status will be incremented once

src/main/java/envoy/client/net/Receiver.java

@@ -79,9 +79,7 @@ public class Receiver extends Thread {
 					@SuppressWarnings("rawtypes")
 					final Consumer processor = processors.get(obj.getClass());
 					if (processor == null)
-						logger.log(Level.WARNING, String.format(
+						logger.log(Level.WARNING, String.format("The received object has the %s for which no processor is defined.", obj.getClass()));
-										"The received object has the %s for which no processor is defined.",
-										obj.getClass()));
 					else processor.accept(obj);
 				}
 			} catch (final SocketException e) {
@@ -103,6 +101,14 @@ public class Receiver extends Thread {
 	 */
 	public <T> void registerProcessor(Class<T> processorClass, Consumer<T> processor) { processors.put(processorClass, processor); }
 
+	/**
+	 * Adds a map of object processors to this {@link Receiver}.
+	 * 
+	 * @param processors the processors to add the processors to add
+	 * @since Envoy Client v0.1-beta
+	 */
+	public void registerProcessors(Map<Class<?>, ? extends Consumer<?>> processors) { this.processors.putAll(processors); }
+
 	/**
 	 * Removes all object processors registered at this {@link Receiver}.
 	 *

src/main/java/envoy/client/net/WriteProxy.java

@@ -4,6 +4,7 @@ import java.io.IOException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import envoy.client.data.Cache;
 import envoy.client.data.LocalDB;
 import envoy.data.Message;
 import envoy.event.MessageStatusChange;
@@ -43,7 +44,7 @@ public class WriteProxy {
 		this.localDB	= localDB;
 
 		// Initialize cache processors for messages and message status change events
-		localDB.getMessageCache().setProcessor(msg -> {
+		localDB.getCacheMap().get(Message.class).setProcessor(msg -> {
 			try {
 				logger.log(Level.FINER, "Sending cached " + msg);
 				client.sendMessage(msg);
@@ -51,7 +52,7 @@ public class WriteProxy {
 				logger.log(Level.SEVERE, "Could not send cached message: ", e);
 			}
 		});
-		localDB.getStatusCache().setProcessor(evt -> {
+		localDB.getCacheMap().get(MessageStatusChange.class).setProcessor(evt -> {
 			logger.log(Level.FINER, "Sending cached " + evt);
 			try {
 				client.sendEvent(evt);
@@ -68,11 +69,7 @@ public class WriteProxy {
 	 * @since Envoy Client v0.3-alpha
 	 */
 	public void flushCache() {
-		// Send messages
+		localDB.getCacheMap().getMap().values().forEach(Cache::relay);
-		localDB.getMessageCache().relay();
-
-		// Send message status change events
-		localDB.getStatusCache().relay();
 	}
 
 	/**
@@ -85,7 +82,7 @@ public class WriteProxy {
 	 */
 	public void writeMessage(Message message) throws IOException {
 		if (client.isOnline()) client.sendMessage(message);
-		else localDB.getMessageCache().accept(message);
+		else localDB.getCacheMap().getApplicable(Message.class).accept(message);
 	}
 
 	/**
@@ -98,6 +95,6 @@ public class WriteProxy {
 	 */
 	public void writeMessageStatusChange(MessageStatusChange evt) throws IOException {
 		if (client.isOnline()) client.sendEvent(evt);
-		else localDB.getStatusCache().accept(evt);
+		else localDB.getCacheMap().getApplicable(MessageStatusChange.class).accept(evt);
 	}
 }

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

@@ -44,10 +44,6 @@ public final class Startup extends Application {
 
 	private LocalDB	localDB;
 	private Client	client;
-	private Cache<Message>				messageCache;
-	private Cache<GroupMessage>			groupMessageCache;
-	private Cache<MessageStatusChange>	messageStatusCache;
-	private Cache<GroupMessageStatusChange>	groupMessageStatusCache;
 
 	private static final ClientConfig	config	= ClientConfig.getInstance();
 	private static final Logger			logger	= EnvoyLog.getLogger(Startup.class);
@@ -102,18 +98,19 @@ public final class Startup extends Application {
 
 		// Initialize client and unread message cache
 		client = new Client();
-		messageCache		= new Cache<>();
+
-		groupMessageCache	= new Cache<>();
+		final var cacheMap = new CacheMap();
-		messageStatusCache	= new Cache<>();
+		cacheMap.put(Message.class, new Cache<Message>());
-		groupMessageStatusCache	= new Cache<>();
+		cacheMap.put(GroupMessage.class, new Cache<GroupMessage>());
+		cacheMap.put(MessageStatusChange.class, new Cache<MessageStatusChange>());
+		cacheMap.put(GroupMessageStatusChange.class, new Cache<GroupMessageStatusChange>());
 
 		stage.setTitle("Envoy");
 		stage.getIcons().add(IconUtil.loadIcon("envoy_logo"));
 
 		final var sceneContext = new SceneContext(stage);
 		sceneContext.load(SceneInfo.LOGIN_SCENE);
-		sceneContext.<LoginScene>getController()
+		sceneContext.<LoginScene>getController().initializeData(client, localDB, cacheMap, sceneContext);
-			.initializeData(client, localDB, messageCache, groupMessageCache, messageStatusCache, groupMessageStatusCache, sceneContext);
 	}
 
 	/**

src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -430,24 +430,6 @@ public final class ChatScene implements Restorable {
 
 	// Context menu actions
 	
-	@FXML
-	private void copyMessage() {
-		try {
-			Toolkit.getDefaultToolkit()
-				.getSystemClipboard()
-				.setContents(new StringSelection(messageList.getSelectionModel().getSelectedItem().getText()), null);
-		} catch (final NullPointerException e) {}
-	}
-
-	@FXML
-	private void deleteMessage() { try {} catch (final NullPointerException e) {} }
-
-	@FXML
-	private void forwardMessage() { try {} catch (final NullPointerException e) {} }
-
-	@FXML
-	private void quoteMessage() { try {} catch (final NullPointerException e) {} }
-
 	@FXML
 	private void deleteContact() { try {} catch (final NullPointerException e) {} }
 
@@ -460,7 +442,4 @@ public final class ChatScene implements Restorable {
 		updateRemainingCharsLabel();
 		postButton.setDisable(messageText.isBlank());
 	}
-
-	@FXML
-	private void loadMessageInfoScene() { try {} catch (final NullPointerException e) {} }
 }

src/main/java/envoy/client/ui/controller/LoginScene.java

@@ -13,12 +13,15 @@ import javafx.scene.control.Alert.AlertType;
 
 import envoy.client.data.*;
 import envoy.client.net.Client;
+import envoy.client.net.WriteProxy;
 import envoy.client.ui.ClearableTextField;
 import envoy.client.ui.SceneContext;
 import envoy.client.ui.Startup;
-import envoy.data.*;
+import envoy.data.LoginCredentials;
+import envoy.data.User;
 import envoy.data.User.UserStatus;
-import envoy.event.*;
+import envoy.event.EventBus;
+import envoy.event.HandshakeRejection;
 import envoy.exception.EnvoyException;
 import envoy.util.Bounds;
 import envoy.util.EnvoyLog;
@@ -54,10 +57,7 @@ public final class LoginScene {
 
 	private Client			client;
 	private LocalDB			localDB;
-	private Cache<Message>					receivedMessageCache;
+	private CacheMap		cacheMap;
-	private Cache<GroupMessage>				receivedGroupMessageCache;
-	private Cache<MessageStatusChange>		receivedMessageStatusChangeCache;
-	private Cache<GroupMessageStatusChange>	receivedGroupMessageStatusChangeCache;
 	private SceneContext	sceneContext;
 
 	private static final Logger			logger		= EnvoyLog.getLogger(LoginScene.class);
@@ -75,40 +75,16 @@ public final class LoginScene {
 	/**
 	 * Loads the login dialog using the FXML file {@code LoginDialog.fxml}.
 	 *
-	 * @param client                                the client used to perform the
+	 * @param client       the client used to perform the handshake
-	 *                                              handshake
+	 * @param localDB      the local database used for offline login
-	 * @param localDB                               the local database used for
+	 * @param cacheMap     the map of all caches needed
-	 *                                              offline
+	 * @param sceneContext the scene context used to initialize the chat scene
-	 *                                              login
-	 * @param receivedMessageCache                  the cache storing messages
-	 *                                              received
-	 *                                              during
-	 *                                              the handshake
-	 * @param receivedGroupMessageCache             the cache storing groupMessages
-	 *                                              received during the handshake
-	 * @param receivedMessageStatusChangeCache      the cache storing
-	 *                                              messageStatusChangeEvents
-	 *                                              received
-	 *                                              during handshake
-	 * @param receivedGroupMessageStatusChangeCache the cache storing
-	 *                                              groupMessageStatusChangeEvents
-	 *                                              received
-	 *                                              during handshake
-	 * @param sceneContext                          the scene context used to
-	 *                                              initialize
-	 *                                              the chat
-	 *                                              scene
 	 * @since Envoy Client v0.1-beta
 	 */
-	public void initializeData(Client client, LocalDB localDB, Cache<Message> receivedMessageCache, Cache<GroupMessage> receivedGroupMessageCache,
+	public void initializeData(Client client, LocalDB localDB, CacheMap cacheMap, SceneContext sceneContext) {
-			Cache<MessageStatusChange> receivedMessageStatusChangeCache, Cache<GroupMessageStatusChange> receivedGroupMessageStatusChangeCache,
-			SceneContext sceneContext) {
 		this.client			= client;
 		this.localDB		= localDB;
-		this.receivedMessageCache					= receivedMessageCache;
+		this.cacheMap		= cacheMap;
-		this.receivedGroupMessageCache				= receivedGroupMessageCache;
-		this.receivedMessageStatusChangeCache		= receivedMessageStatusChangeCache;
-		this.receivedGroupMessageStatusChangeCache	= receivedGroupMessageStatusChangeCache;
 		this.sceneContext	= sceneContext;
 
 		// Prepare handshake
@@ -156,18 +132,10 @@ public final class LoginScene {
 
 	private void performHandshake(LoginCredentials credentials) {
 		try {
-			client.performHandshake(credentials,
+			client.performHandshake(credentials, cacheMap);
-					receivedMessageCache,
-					receivedGroupMessageCache,
-					receivedMessageStatusChangeCache,
-					receivedGroupMessageStatusChangeCache);
 			if (client.isOnline()) {
-				client.initReceiver(localDB,
-						receivedMessageCache,
-						receivedGroupMessageCache,
-						receivedMessageStatusChangeCache,
-						receivedGroupMessageStatusChangeCache);
 				loadChatScene();
+				client.initReceiver(localDB, cacheMap);
 			}
 		} catch (IOException | InterruptedException | TimeoutException e) {
 			logger.log(Level.INFO, "Could not connect to server. Entering offline mode...");
@@ -207,7 +175,7 @@ public final class LoginScene {
 		}
 
 		// Initialize write proxy
-		final var writeProxy = client.createWriteProxy(localDB);
+		final var writeProxy = new WriteProxy(client, localDB);
 
 		localDB.synchronize();
 
@@ -227,11 +195,5 @@ public final class LoginScene {
 		sceneContext.getStage().setMinWidth(350);
 		sceneContext.load(SceneContext.SceneInfo.CHAT_SCENE);
 		sceneContext.<ChatScene>getController().initializeData(sceneContext, localDB, client, writeProxy);
-
-		// Relay unread messages from cache
-		if (receivedMessageCache != null && client.isOnline()) receivedMessageCache.relay();
-		if (receivedGroupMessageCache != null && client.isOnline()) receivedGroupMessageCache.relay();
-		if (receivedMessageStatusChangeCache != null && client.isOnline()) receivedMessageStatusChangeCache.relay();
-		if (receivedGroupMessageStatusChangeCache != null && client.isOnline()) receivedGroupMessageStatusChangeCache.relay();
 	}
 }

src/main/java/envoy/client/ui/listcell/MessageControl.java

@@ -1,10 +1,16 @@
 package envoy.client.ui.listcell;
 
+import java.awt.Toolkit;
+import java.awt.datatransfer.StringSelection;
 import java.time.format.DateTimeFormatter;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import javafx.geometry.Insets;
+import javafx.scene.control.ContextMenu;
 import javafx.scene.control.Label;
+import javafx.scene.control.MenuItem;
 import javafx.scene.image.Image;
 import javafx.scene.image.ImageView;
 import javafx.scene.layout.VBox;
@@ -14,6 +20,7 @@ import envoy.client.ui.IconUtil;
 import envoy.data.Message;
 import envoy.data.Message.MessageStatus;
 import envoy.data.User;
+import envoy.util.EnvoyLog;
 
 /**
  * This class formats a single {@link Message} into a UI component.
@@ -25,50 +32,89 @@ import envoy.data.User;
  * @author Leon Hofmeister
  * @since Envoy Client v0.1-beta
  */
-public class MessageControl extends VBox {
+public class MessageControl extends Label {
 
 	private static User								client;
 	private static final DateTimeFormatter			dateFormat		= DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm");
 	private static final Map<MessageStatus, Image>	statusImages	= IconUtil.loadByEnum(MessageStatus.class, 16);
 
+	private static final Logger logger = EnvoyLog.getLogger(MessageControl.class);
+
 	/**
 	 *
 	 * @param message the message that should be formatted
 	 * @since Envoy Client v0.1-beta
 	 */
 	public MessageControl(Message message) {
-		// Creating the underlying VBox, the dateLabel and the textLabel
+		// Creating the underlying VBox and the dateLabel
-		super(new Label(dateFormat.format(message.getCreationDate())));
+		final var vbox = new VBox(new Label(dateFormat.format(message.getCreationDate())));
+
+		// Creating the actions for the MenuItems
+		final ContextMenu	contextMenu		= new ContextMenu();
+		final MenuItem		copyMenuItem	= new MenuItem("Copy");
+		final MenuItem		deleteMenuItem	= new MenuItem("Delete");
+		final MenuItem		forwardMenuItem	= new MenuItem("Forward");
+		final MenuItem		quoteMenuItem	= new MenuItem("Quote");
+		final MenuItem		infoMenuItem	= new MenuItem("Info");
+		copyMenuItem.setOnAction(e -> copyMessage(message));
+		deleteMenuItem.setOnAction(e -> deleteMessage(message));
+		forwardMenuItem.setOnAction(e -> forwardMessage(message));
+		quoteMenuItem.setOnAction(e -> quoteMessage(message));
+		infoMenuItem.setOnAction(e -> loadMessageInfoScene(message));
+		contextMenu.getItems().addAll(copyMenuItem, deleteMenuItem, forwardMenuItem, quoteMenuItem, infoMenuItem);
 
 		// Handling message attachment display
-		if (message.hasAttachment()) switch (message.getAttachment().getType()) {
+		if (message.hasAttachment()) {
+			switch (message.getAttachment().getType()) {
 				case PICTURE:
 					break;
 				case VIDEO:
 					break;
 				case VOICE:
-				getChildren().add(new AudioControl(message.getAttachment().getData()));
+					vbox.getChildren().add(new AudioControl(message.getAttachment().getData()));
 					break;
 				case DOCUMENT:
 					break;
 			}
-
+			final var saveAttachment = new MenuItem("Save attachment");
+			saveAttachment.setOnAction(e -> saveAttachment(message));
+			contextMenu.getItems().add(saveAttachment);
+		}
+		// Creating the textLabel
 		final var textLabel = new Label(message.getText());
 		textLabel.setWrapText(true);
-		getChildren().add(textLabel);
+		vbox.getChildren().add(textLabel);
 		// Setting the message status icon and background color
 		if (message.getSenderID() == client.getID()) {
 			final var statusIcon = new ImageView(statusImages.get(message.getStatus()));
 			statusIcon.setPreserveRatio(true);
-			getChildren().add(statusIcon);
+			vbox.getChildren().add(statusIcon);
 			getStyleClass().add("own-message");
 		} else {
 			getStyleClass().add("received-message");
 		}
 		// Adjusting height and weight of the cell to the corresponding ListView
 		paddingProperty().setValue(new Insets(5, 20, 5, 20));
+		setContextMenu(contextMenu);
+		setGraphic(vbox);
 	}
 
+	// Context Menu actions
+
+	private void copyMessage(Message message) {
+		Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new StringSelection(message.getText()), null);
+	}
+
+	private void deleteMessage(Message message) { logger.log(Level.FINEST, "message deletion was requested for " + message); }
+
+	private void forwardMessage(Message message) { logger.log(Level.FINEST, "message forwarding was requested for " + message); }
+
+	private void quoteMessage(Message message) { logger.log(Level.FINEST, "message quotation was requested for " + message); }
+
+	private void loadMessageInfoScene(Message message) { logger.log(Level.FINEST, "message info scene was requested for " + message); }
+
+	private void saveAttachment(Message message) { logger.log(Level.FINEST, "attachment saving was requested for " + message); }
+
 	/**
 	 * @param client the user who has logged in
 	 * @since Envoy Client v0.1-beta

src/main/resources/fxml/ChatScene.fxml

@@ -92,22 +92,6 @@
 			<padding>
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</padding>
-			<contextMenu>
-				<ContextMenu anchorLocation="CONTENT_TOP_LEFT">
-					<items>
-						<MenuItem mnemonicParsing="false" onAction="#copyMessage"
-							text="Copy" />
-						<MenuItem mnemonicParsing="false"
-							onAction="#deleteMessage" text="Delete" />
-						<MenuItem mnemonicParsing="false"
-							onAction="#forwardMessage" text="Forward" />
-						<MenuItem mnemonicParsing="false"
-							onAction="#quoteMessage" text="Quote" />
-						<MenuItem mnemonicParsing="false"
-							onAction="#loadMessageInfoScene" text="Info" />
-					</items>
-				</ContextMenu>
-			</contextMenu>
 		</ListView>
 		<ButtonBar prefWidth="436.0" GridPane.columnIndex="1"
 			GridPane.columnSpan="2147483647" GridPane.halignment="CENTER"