Added Client#sendMessage(Message), closing socket on exit

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

@@ -1,11 +1,14 @@
 package envoy.client;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.net.Socket;
 import java.util.Map;
 import java.util.logging.Logger;
 
 import envoy.client.util.EnvoyLog;
 import envoy.data.LoginCredentials;
+import envoy.data.Message;
 import envoy.data.User;
 import envoy.exception.EnvoyException;
 import envoy.util.SerializationUtils;
@@ -20,13 +23,16 @@ import envoy.util.SerializationUtils;
  * @author Leon Hofmeister
  * @since Envoy v0.1-alpha
  */
-public class Client {
+public class Client implements Closeable {
+
+	private Socket		socket;
+	private Receiver	receiver;
+	private boolean		online;
 
-	private Socket			socket;
-	private Config			config	= Config.getInstance();
 	private volatile User	sender;
 	private User			recipient;
-	private boolean			online;
+
+	private Config config = Config.getInstance();
 
 	private static final Logger logger = EnvoyLog.getLogger(Client.class.getSimpleName());
 
@@ -39,20 +45,21 @@ public class Client {
 	 * @since Envoy v0.2-alpha
 	 */
 	public void onlineInit(LoginCredentials credentials) throws Exception {
+		// Establish TCP connection
 		logger.info(String.format("Attempting connection to server %s:%d...", config.getServer(), config.getPort()));
 		socket = new Socket(config.getServer(), config.getPort());
 		logger.info("Successfully connected to server.");
 
-		// Write login credentials
-		logger.finest("Sending login credentials...");
-		SerializationUtils.writeBytesWithLength(credentials, socket.getOutputStream());
-
 		// Create message receiver
-		Receiver receiver = new Receiver(socket.getInputStream());
+		receiver = new Receiver(socket.getInputStream());
 
 		// Register user creation processor
 		receiver.registerProcessor(User.class, sender -> { logger.info("Acquired user object " + sender); this.sender = sender; });
 
+		// Write login credentials
+		logger.finest("Sending login credentials...");
+		SerializationUtils.writeBytesWithLength(credentials, socket.getOutputStream());
+
 		// Start receiver
 		new Thread(receiver).start();
 
@@ -66,6 +73,18 @@ public class Client {
 		online = true;
 	}
 
+	/**
+	 * Sends a message to the server.
+	 * 
+	 * @param message the message to send
+	 * @throws IOException if the message does not reach the server
+	 * @since Envoy v0.3-alpha
+	 */
+	public void sendMessage(Message message) throws IOException {
+		if (!online) throw new IllegalStateException("Client is not online");
+		SerializationUtils.writeBytesWithLength(message, socket.getOutputStream());
+	}
+
 	/**
 	 * @return a {@code Map<String, User>} of all users on the server with their
 	 *         user names as keys
@@ -76,6 +95,9 @@ public class Client {
 		return null;
 	}
 
+	@Override
+	public void close() throws IOException { if (online) socket.close(); }
+
 	/**
 	 * @return the sender object that represents this client.
 	 * @since Envoy v0.1-alpha
@@ -110,6 +132,11 @@ public class Client {
 	 */
 	public boolean hasRecipient() { return recipient != null; }
 
+	/**
+	 * @return the {@link Receiver} used by this {@link Client}
+	 */
+	public Receiver getReceiver() { return receiver; }
+
 	/**
 	 * @return {@code true} if a connection to the server could be established
 	 * @since Envoy v0.2-alpha

src/main/java/envoy/client/ObjectProcessor.java

@@ -1,15 +0,0 @@
-package envoy.client;
-
-
-/**
- * Project: <strong>envoy-client</strong><br>
- * File: <strong>ObjectProcessor.java</strong><br>
- * Created: <strong>30.12.2019</strong><br>
- * 
- * @author Kai S. K. Engelbart
- * @since Envoy v0.3-alpha
- */
-public interface ObjectProcessor<T> {
-
-	void process(T input);
-}

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

@@ -4,6 +4,7 @@ import java.io.InputStream;
 import java.io.ObjectInputStream;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.function.Consumer;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -19,11 +20,16 @@ import envoy.client.util.EnvoyLog;
  */
 public class Receiver implements Runnable {
 
-	private InputStream				in;
+	private InputStream					in;
-	private Map<Class<?>, ObjectProcessor<?>>	processors	= new HashMap<>();
+	private Map<Class<?>, Consumer<?>>	processors	= new HashMap<>();
 
 	private static final Logger logger = EnvoyLog.getLogger(Receiver.class.getSimpleName());
 
+	/**
+	 * Creates an instance of {@link Receiver}.
+	 *
+	 * @param in the {@link InputStream} to parse objects from
+	 */
 	public Receiver(InputStream in) { this.in = in; }
 
 	@SuppressWarnings("unchecked")
@@ -35,16 +41,23 @@ public class Receiver implements Runnable {
 				logger.finest("Received object " + obj);
 
 				// Get appropriate processor
-				ObjectProcessor processor = processors.get(obj.getClass());
+				@SuppressWarnings("rawtypes")
+				Consumer processor = processors.get(obj.getClass());
 				if (processor == null)
 					logger.severe(String.format("The received object has the class %s for which no processor is defined.", obj.getClass()));
-				else
+				else processor.accept(obj);
-					processor.process(obj);
 			}
-		} catch(Exception e) {
+		} catch (Exception e) {
 			logger.log(Level.SEVERE, "Error on receiver thread", e);
 		}
 	}
 
-	public <T> void registerProcessor(Class<T> processorClass, ObjectProcessor<T> processor) { processors.put(processorClass, processor); }
+	/**
+	 * Adds an object processor to this {@link Receiver}. It will be called once an
+	 * object of the accepted class has been received.
+	 * 
+	 * @param processorClass the object class accepted by the processor
+	 * @param processor      the object processor
+	 */
+	public <T> void registerProcessor(Class<T> processorClass, Consumer<T> processor) { processors.put(processorClass, processor); }
 }

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

@@ -246,8 +246,13 @@ public class ChatWindow extends JFrame {
 
 		if (!messageEnterTextArea.getText().isEmpty()) try {
 
-			// Create and send message object
+			// Create message
 			final Message message = new MessageBuilder(localDB.getUser(), currentChat.getRecipient()).setText(messageEnterTextArea.getText()).build();
+
+			// Send message
+			client.sendMessage(message);
+
+			// Add message to LocalDB and update UI
 			currentChat.appendMessage(message);
 			messageList.setModel(currentChat.getModel());
 

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

@@ -2,6 +2,7 @@ package envoy.client.ui;
 
 import java.awt.EventQueue;
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -125,17 +126,17 @@ public class Startup {
 		// Initialize chats in local database
 		try {
 			localDB.initializeDBFile();
-			// TODO: localDB.loadChats();
+			localDB.loadChats();
+		} catch (FileNotFoundException e) {
+			// The local database file has not yet been created, probably first login
 		} catch (Exception e) {
 			e.printStackTrace();
 			JOptionPane.showMessageDialog(null,
-					"Error while loading local database: " + e.toString() + "\nChats will not be stored locally.",
+					"Error while loading local database: " + e.toString() + "\nChats might not be stored locally.",
 					"Local DB error",
 					JOptionPane.WARNING_MESSAGE);
 		}
 
-		logger.info("Client user ID: " + client.getSender().getId());
-
 		// Save all users to the local database
 		if (client.isOnline()) localDB.setUsers(client.getUsers());
 
@@ -147,8 +148,13 @@ public class Startup {
 				try {
 					new StatusTrayIcon(chatWindow).show();
 
-					// If the tray icon is supported and corresponding settings is set, hide the chat window on close
+					// If the tray icon is supported and corresponding settings is set, hide the
-					Settings.getInstance().getItems().get("onCloseMode").setChangeHandler((onCloseMode) -> chatWindow.setDefaultCloseOperation((boolean) onCloseMode ? JFrame.HIDE_ON_CLOSE : JFrame.EXIT_ON_CLOSE)); 
+					// chat window on close
+					Settings.getInstance()
+						.getItems()
+						.get("onCloseMode")
+						.setChangeHandler((onCloseMode) -> chatWindow
+							.setDefaultCloseOperation((boolean) onCloseMode ? JFrame.HIDE_ON_CLOSE : JFrame.EXIT_ON_CLOSE));
 				} catch (EnvoyException e) {
 					logger.warning("The StatusTrayIcon is not supported on this platform!");
 				}
@@ -160,13 +166,14 @@ public class Startup {
 		// Save Settings and LocalDB on shutdown
 		Runtime.getRuntime().addShutdownHook(new Thread(() -> {
 			try {
-				logger.info("Saving local database...");
+				logger.info("Closing connection...");
+				client.close();
+
+				logger.info("Saving local database and settings...");
 				localDB.save();
-				logger.info("Saving settings...");
 				Settings.getInstance().save();
-			} catch (IOException e1) {
+			} catch (IOException e) {
-				e1.printStackTrace();
+				logger.log(Level.SEVERE, "Unable to save local files", e);
-				logger.log(Level.WARNING, "Unable to save the messages", e1);
 			}
 		}));
 	}