Fix write proxy initialization

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

@@ -51,12 +51,6 @@ public final class Cache<T> implements Consumer<T>, Serializable {
 	 */
 	public void setProcessor(Consumer<T> processor) { this.processor = processor; }
 
-	/**
-	 * @return the processor
-	 * @since Envoy Client v0.2-beta
-	 */
-	public Consumer<T> getProcessor() { return processor; }
-
 	/**
 	 * Relays all cached elements to the processor.
 	 *

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

@@ -18,24 +18,33 @@ import envoy.client.ui.SceneContext;
  */
 public class Context {
 
+	private WriteProxy		writeProxy;
+	private LocalDB			localDB;
+	private Stage			stage;
+	private SceneContext	sceneContext;
+
 	private final Client client = new Client();
 
-	private WriteProxy writeProxy;
-
-	private LocalDB localDB;
-
-	private Stage stage;
-
-	private SceneContext sceneContext;
-
 	private static final Context instance = new Context();
 
+	private Context() {}
+
 	/**
 	 * @return the instance of {@code Context} used throughout Envoy
 	 * @since Envoy Client v0.2-beta
 	 */
 	public static Context getInstance() { return instance; }
 
+	/**
+	 * Initializes the write proxy given that {@code localDB} is initialized.
+	 *
+	 * @since Envoy Client v0.2-beta
+	 */
+	public void initWriteProxy() {
+		if (localDB == null) throw new IllegalStateException("The LocalDB has to be initialized!");
+		writeProxy = new WriteProxy(client, localDB);
+	}
+
 	/**
 	 * @return the localDB
 	 * @since Envoy Client v0.2-beta
@@ -81,14 +90,6 @@ public class Context {
 	 */
 	public Stage getStage() { return stage; }
 
-	private Context() {}
-
-	/**
-	 * @param writeProxy the writeProxy to set
-	 * @since Envoy Client v0.2-beta
-	 */
-	public void setWriteProxy(WriteProxy writeProxy) { this.writeProxy = writeProxy; }
-
 	/**
 	 * @param stage the stage to set
 	 * @since Envoy Client v0.2-beta

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

@@ -5,7 +5,6 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import envoy.client.data.Cache;
-import envoy.client.data.Context;
 import envoy.client.data.LocalDB;
 import envoy.data.Message;
 import envoy.event.MessageStatusChange;
@@ -25,8 +24,8 @@ import envoy.util.EnvoyLog;
  */
 public final class WriteProxy {
 
-	private final Client	client	= Context.getInstance().getClient();
-	private final LocalDB	localDB	= Context.getInstance().getLocalDB();
+	private final Client	client;
+	private final LocalDB	localDB;
 
 	private static final Logger logger = EnvoyLog.getLogger(WriteProxy.class);
 
@@ -34,9 +33,14 @@ public final class WriteProxy {
 	 * Initializes a write proxy using a client and a local database. The
 	 * corresponding cache processors are injected into the caches.
 	 *
+	 * @param client  the client instance used to send messages and events if online
+	 * @param localDB the local database used to cache messages and events if
+	 *                offline
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public WriteProxy() {
+	public WriteProxy(Client client, LocalDB localDB) {
+		this.client		= client;
+		this.localDB	= localDB;
 
 		// Initialize cache processors for messages and message status change events
 		localDB.getCacheMap().get(Message.class).setProcessor(msg -> {
@@ -63,32 +67,7 @@ public final class WriteProxy {
 	 *
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public void flushCache() {
-
-		// supplying default values if not initialized - for some reason these
-		// processors can be not defined...
-		final var messageCache = localDB.getCacheMap().get(Message.class);
-		if (messageCache.getProcessor() == null) messageCache.setProcessor(msg -> {
-			try {
-				logger.log(Level.FINER, "Sending cached " + msg);
-				client.sendMessage(msg);
-			} catch (final IOException e) {
-				logger.log(Level.SEVERE, "Could not send cached message: ", e);
-			}
-		});
-		final var messageStatusCache = localDB.getCacheMap().get(MessageStatusChange.class);
-		if (messageStatusCache.getProcessor() == null) messageStatusCache.setProcessor(evt -> {
-			logger.log(Level.FINER, "Sending cached " + evt);
-			try {
-				client.sendEvent(evt);
-			} catch (final IOException e) {
-				logger.log(Level.SEVERE, "Could not send cached message status change event: ", e);
-			}
-		});
-
-		// sending these solely local objects to the server
-		localDB.getCacheMap().getMap().values().forEach(Cache::relay);
-	}
+	public void flushCache() { localDB.getCacheMap().getMap().values().forEach(Cache::relay); }
 
 	/**
 	 * Delivers a message to the server if online. Otherwise the message is cached

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

@@ -15,7 +15,6 @@ import javafx.stage.Stage;
 
 import envoy.client.data.*;
 import envoy.client.net.Client;
-import envoy.client.net.WriteProxy;
 import envoy.client.ui.SceneContext.SceneInfo;
 import envoy.client.ui.controller.LoginScene;
 import envoy.data.*;
@@ -91,7 +90,6 @@ public final class Startup extends Application {
 
 		final var sceneContext = new SceneContext(stage);
 		context.setSceneContext(sceneContext);
-		context.setWriteProxy(new WriteProxy());
 
 		// Perform automatic login if configured
 		if (config.hasLoginCredentials())
@@ -174,6 +172,7 @@ public final class Startup extends Application {
 		try {
 			localDB.initializeUserStorage();
 			localDB.loadUserData();
+			context.initWriteProxy();
 		} catch (final FileNotFoundException e) {
 			// The local database file has not yet been created, probably first login
 		} catch (final Exception e) {