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

@@ -35,7 +35,6 @@ public final class ClientConfig extends Config {
 		put("server", "s", identity());
 		put("port", "p", Integer::parseInt);
 		put("localDB", "db", File::new);
-		put("ignoreLocalDB", "nodb", Boolean::parseBoolean);
 		put("user", "u", identity());
 		put("password", "pw", identity());
 	}
@@ -58,12 +57,6 @@ public final class ClientConfig extends Config {
 	 */
 	public File getLocalDB() { return (File) items.get("localDB").get(); }
 
-	/**
-	 * @return {@code true} if the local database is to be ignored
-	 * @since Envoy Client v0.3-alpha
-	 */
-	public Boolean isIgnoreLocalDB() { return (Boolean) items.get("ignoreLocalDB").get(); }
-
 	/**
 	 * @return the user name
 	 * @since Envoy Client v0.3-alpha

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

@@ -1,17 +1,19 @@
 package envoy.client.data;
 
+import java.io.*;
 import java.time.Instant;
 import java.util.*;
 
 import envoy.data.*;
-import envoy.event.GroupResize;
-import envoy.event.MessageStatusChange;
-import envoy.event.NameChange;
+import envoy.event.*;
+import envoy.util.SerializationUtils;
 
 /**
  * Stores information about the current {@link User} and their {@link Chat}s.
  * For message ID generation a {@link IDGenerator} is stored as well.
  * <p>
+ * The managed objects are stored inside a folder in the local file system.
+ * <p>
  * Project: <strong>envoy-client</strong><br>
  * File: <strong>LocalDB.java</strong><br>
  * Created: <strong>3 Feb 2020</strong><br>
@@ -19,60 +21,105 @@ import envoy.event.NameChange;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public abstract class LocalDB {
+public final class LocalDB {
 
-	protected User				user;
-	protected Map<String, User>	users		= new HashMap<>();
-	protected List<Chat>		chats		= new ArrayList<>();
-	protected IDGenerator		idGenerator;
-	protected CacheMap			cacheMap	= new CacheMap();
-	protected Instant			lastSync	= Instant.EPOCH;
+	private User				user;
+	private Map<String, User>	users		= new HashMap<>();
+	private List<Chat>			chats		= new ArrayList<>();
+	private IDGenerator			idGenerator;
+	private CacheMap			cacheMap	= new CacheMap();
+	private Instant				lastSync	= Instant.EPOCH;
+	private File				dbDir, userFile, idGeneratorFile, usersFile;
 
-	{
+	/**
+	 * Constructs an empty local database. To serialize any user-specific data to
+	 * the file system, call {@link LocalDB#initializeUserStorage()} first
+	 * and then {@link LocalDB#save(boolean)}.
+	 *
+	 * @param dbDir the directory in which to persist data
+	 * @throws IOException if {@code dbDir} is a file (and not a directory)
+	 * @since Envoy Client v0.2-beta
+	 */
+	public LocalDB(File dbDir) throws IOException {
+		this.dbDir = dbDir;
+
+		// Test if the database directory is actually a directory
+		if (dbDir.exists() && !dbDir.isDirectory())
+			throw new IOException(String.format("LocalDBDir '%s' is not a directory!", dbDir.getAbsolutePath()));
+
+		// Initialize global files
+		idGeneratorFile	= new File(dbDir, "id_gen.db");
+		usersFile		= new File(dbDir, "users.db");
+
+		// Initialize offline caches
 		cacheMap.put(Message.class, new Cache<>());
 		cacheMap.put(MessageStatusChange.class, new Cache<>());
 	}
 
 	/**
-	 * Initializes a storage space for a user-specific list of chats.
+	 * Creates a database file for a user-specific list of chats.
 	 *
-	 * @since Envoy Client v0.3-alpha
+	 * @throws IllegalStateException if the client user is not specified
+	 * @since Envoy Client v0.1-alpha
 	 */
-	public void initializeUserStorage() {}
+	public void initializeUserStorage() {
+		if (user == null) throw new IllegalStateException("Client user is null, cannot initialize user storage");
+		userFile = new File(dbDir, user.getID() + ".db");
+	}
 
 	/**
 	 * Stores all users. If the client user is specified, their chats will be stored
 	 * as well. The message id generator will also be saved if present.
 	 *
 	 * @param isOnline determines which {@code lastSync} time stamp is saved
-	 * @throws Exception if the saving process failed
+	 * @throws IOException if the saving process failed
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public void save(boolean isOnline) throws Exception {}
+	public void save(boolean isOnline) throws IOException {
+		// Save users
+		SerializationUtils.write(usersFile, users);
+
+		// Save user data and last sync time stamp
+		if (user != null) SerializationUtils.write(userFile, chats, cacheMap, isOnline ? Instant.now() : lastSync);
+
+		// Save id generator
+		if (hasIDGenerator()) SerializationUtils.write(idGeneratorFile, idGenerator);
+	}
 
 	/**
 	 * Loads all user data.
 	 *
-	 * @throws Exception if the loading process failed
+	 * @throws ClassNotFoundException if the loading process failed
+	 * @throws IOException            if the loading process failed
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public void loadUsers() throws Exception {}
+	public void loadUsers() throws ClassNotFoundException, IOException { users = SerializationUtils.read(usersFile, HashMap.class); }
 
 	/**
 	 * Loads all data of the client user.
 	 *
-	 * @throws Exception if the loading process failed
+	 * @throws ClassNotFoundException if the loading process failed
+	 * @throws IOException            if the loading process failed
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public void loadUserData() throws Exception {}
+	public void loadUserData() throws ClassNotFoundException, IOException {
+		try (var in = new ObjectInputStream(new FileInputStream(userFile))) {
+			chats		= (ArrayList<Chat>) in.readObject();
+			cacheMap	= (CacheMap) in.readObject();
+			lastSync	= (Instant) in.readObject();
+		}
+	}
 
 	/**
 	 * Loads the ID generator. Any exception thrown during this process is ignored.
 	 *
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public void loadIDGenerator() {}
-
+	public void loadIDGenerator() {
+		try {
+			idGenerator = SerializationUtils.read(idGeneratorFile, IDGenerator.class);
+		} catch (ClassNotFoundException | IOException e) {}
+	}
 	/**
 	 * Synchronizes the contact list of the client user with the chat and user
 	 * storage.

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

@@ -1,90 +0,0 @@
-package envoy.client.data;
-
-import java.io.*;
-import java.time.Instant;
-import java.util.ArrayList;
-import java.util.HashMap;
-
-import envoy.data.IDGenerator;
-import envoy.util.SerializationUtils;
-
-/**
- * Implements a {@link LocalDB} in a way that stores all information inside a
- * folder on the local file system.
- * <p>
- * Project: <strong>envoy-client</strong><br>
- * File: <strong>PersistentLocalDB.java</strong><br>
- * Created: <strong>27.10.2019</strong><br>
- *
- * @author Kai S. K. Engelbart
- * @author Maximilian K&auml;fer
- * @since Envoy Client v0.1-alpha
- */
-public final class PersistentLocalDB extends LocalDB {
-
-	private File dbDir, userFile, idGeneratorFile, usersFile;
-
-	/**
-	 * Constructs an empty local database. To serialize any user-specific data to
-	 * the file system, call {@link PersistentLocalDB#initializeUserStorage()} first
-	 * and then {@link PersistentLocalDB#save(boolean)}.
-	 *
-	 * @param dbDir the directory in which to persist data
-	 * @throws IOException if {@code dbDir} is a file (and not a directory)
-	 * @since Envoy Client v0.1-alpha
-	 */
-	public PersistentLocalDB(File dbDir) throws IOException {
-		this.dbDir = dbDir;
-
-		// Test if the database directory is actually a directory
-		if (dbDir.exists() && !dbDir.isDirectory())
-			throw new IOException(String.format("LocalDBDir '%s' is not a directory!", dbDir.getAbsolutePath()));
-
-		// Initialize global files
-		idGeneratorFile	= new File(dbDir, "id_gen.db");
-		usersFile		= new File(dbDir, "users.db");
-	}
-
-	/**
-	 * Creates a database file for a user-specific list of chats.
-	 *
-	 * @throws IllegalStateException if the client user is not specified
-	 * @since Envoy Client v0.1-alpha
-	 */
-	@Override
-	public void initializeUserStorage() {
-		if (user == null) throw new IllegalStateException("Client user is null, cannot initialize user storage");
-		userFile = new File(dbDir, user.getID() + ".db");
-	}
-
-	@Override
-	public void save(boolean isOnline) throws IOException {
-		// Save users
-		SerializationUtils.write(usersFile, users);
-
-		// Save user data and last sync time stamp
-		if (user != null) SerializationUtils.write(userFile, chats, cacheMap, isOnline ? Instant.now() : lastSync);
-
-		// Save id generator
-		if (hasIDGenerator()) SerializationUtils.write(idGeneratorFile, idGenerator);
-	}
-
-	@Override
-	public void loadUsers() throws ClassNotFoundException, IOException { users = SerializationUtils.read(usersFile, HashMap.class); }
-
-	@Override
-	public void loadUserData() throws ClassNotFoundException, IOException {
-		try (var in = new ObjectInputStream(new FileInputStream(userFile))) {
-			chats		= (ArrayList<Chat>) in.readObject();
-			cacheMap	= (CacheMap) in.readObject();
-			lastSync	= (Instant) in.readObject();
-		}
-	}
-
-	@Override
-	public void loadIDGenerator() {
-		try {
-			idGenerator = SerializationUtils.read(idGeneratorFile, IDGenerator.class);
-		} catch (ClassNotFoundException | IOException e) {}
-	}
-}

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

@@ -1,15 +0,0 @@
-package envoy.client.data;
-
-/**
- * Implements a {@link LocalDB} in a way that does not persist any information
- * after application shutdown.
- * <p>
- * Project: <strong>envoy-client</strong><br>
- * File: <strong>TransientLocalDB.java</strong><br>
- * Created: <strong>3 Feb 2020</strong><br>
- *
- * @author Kai S. K. Engelbart
- * @since Envoy Client v0.3-alpha
- */
-public final class TransientLocalDB extends LocalDB {
-}

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

@@ -1,12 +1,9 @@
 package envoy.client.ui;
 
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.IOException;
+import java.io.*;
 import java.time.Instant;
 import java.util.concurrent.TimeoutException;
-import java.util.logging.Level;
-import java.util.logging.Logger;
+import java.util.logging.*;
 
 import javafx.application.Application;
 import javafx.scene.control.Alert;
@@ -19,8 +16,7 @@ import envoy.client.ui.SceneContext.SceneInfo;
 import envoy.client.ui.controller.LoginScene;
 import envoy.data.*;
 import envoy.data.User.UserStatus;
-import envoy.event.GroupMessageStatusChange;
-import envoy.event.MessageStatusChange;
+import envoy.event.*;
 import envoy.exception.EnvoyException;
 import envoy.util.EnvoyLog;
 
@@ -70,11 +66,8 @@ public final class Startup extends Application {
 		logger.log(Level.INFO, "Envoy starting...");
 
 		// Initialize the local database
-		if (config.isIgnoreLocalDB()) {
-			localDB = new TransientLocalDB();
-			new Alert(AlertType.WARNING, "Ignoring local database.\nMessages will not be saved!").showAndWait();
-		} else try {
-			localDB = new PersistentLocalDB(new File(config.getHomeDirectory(), config.getLocalDB().getPath()));
+		try {
+			localDB = new LocalDB(new File(config.getHomeDirectory(), config.getLocalDB().getPath()));
 		} catch (final IOException e3) {
 			logger.log(Level.SEVERE, "Could not initialize local database: ", e3);
 			new Alert(AlertType.ERROR, "Could not initialize local database!\n" + e3).showAndWait();