Added ObjectProcessor interface with some implementations

src/main/java/envoy/server/LoginCredentialProcessor.java

@@ -0,0 +1,27 @@
+package envoy.server;
+
+import envoy.data.LoginCredentials;
+import envoy.data.User;
+
+/**
+ * Project: <strong>envoy-server-standalone</strong><br>
+ * File: <strong>LoginCredentialProcessor.java</strong><br>
+ * Created: <strong>30.12.2019</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since
+ */
+public class LoginCredentialProcessor implements ObjectProcessor<LoginCredentials, User> {
+
+	// TODO: Acquire user IDs from database
+	private static long currentUserId = 1;
+
+	@Override
+	public User process(LoginCredentials input) {
+		System.out.println("Received login credentials " + input);
+		return new User(currentUserId++, input.getName());
+	}
+
+	@Override
+	public Class<LoginCredentials> getInputClass() { return LoginCredentials.class; }
+}

src/main/java/envoy/server/MessageProcessor.java

@@ -0,0 +1,20 @@
+package envoy.server;
+
+import envoy.data.Message;
+
+/**
+ * Project: <strong>envoy-server-standalone</strong><br>
+ * File: <strong>MessageProcessor.java</strong><br>
+ * Created: <strong>30.12.2019</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since
+ */
+public class MessageProcessor implements ObjectProcessor<Message, Void> {
+
+	@Override
+	public Void process(Message input) { return null; }
+
+	@Override
+	public Class<Message> getInputClass() { return Message.class; }
+}

src/main/java/envoy/server/ObjectMessageProcessor.java

@@ -5,15 +5,12 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
+import java.util.Set;
 
 import com.jenkov.nioserver.IMessageProcessor;
 import com.jenkov.nioserver.Message;
 import com.jenkov.nioserver.WriteProxy;
 
-import envoy.data.LoginCredentials;
-import envoy.data.User;
-import envoy.event.Event;
-
 /**
  * Project: <strong>envoy-server-standalone</strong><br>
  * File: <strong>ObjectMessageProcessor.java</strong><br>
@@ -24,63 +21,31 @@ import envoy.event.Event;
  */
 public class ObjectMessageProcessor implements IMessageProcessor {
 
+	private final Set<ObjectProcessor<?, ?>> processors;
+
+	public ObjectMessageProcessor(Set<ObjectProcessor<?, ?>> processors) { this.processors = processors; }
+
+	@SuppressWarnings("unchecked")
 	@Override
 	public void process(Message message, WriteProxy writeProxy) {
 		try (ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(message.sharedArray, message.offset + 4, message.length - 4))) {
 			Object obj = in.readObject();
-
 			System.out.println("Read object: " + obj.toString());
-			handleObject(message, writeProxy, obj);
-		} catch (IOException | ClassNotFoundException e) {
-			e.printStackTrace();
-		}
-	}
 
-	/**
-	 * This method splits incoming objects into the different objects that are
-	 * relevant to the server and guides them to their predestined spot.
-	 * 
-	 * @param request    the {@link Message} in which the objects are saved
-	 * @param writeProxy the writeProxy to define the resulting socket for
-	 * @param obj        the object that has been read out of the {@link Message}
-	 * @throws IllegalArgumentException if the object given is neither an
-	 *                                  {@link envoy.data.Message}, an {@link Event}
-	 *                                  nor a {@link LoginCredentials}
-	 * @since Envoy Server Standalone v0.1-alpha
-	 */
-	private void handleObject(Message request, WriteProxy writeProxy, Object obj) throws IllegalArgumentException {
-
-		long	currentUserID			= 0;								// TODO temporary. Only for testing purposes
-		boolean	responseToSameSocket	= false, immediateResponse = true;
-		Object	usage;
-
-		// determining the type of the incoming object
-		if (obj instanceof envoy.data.Message) {// if object is Message
-			envoy.data.Message cast = (envoy.data.Message) obj;
-			usage				= cast.getClass();
-			immediateResponse	= isRecipientAvailable(-1);	// TODO replace with wanted clientID
-		} else if (obj instanceof Event) {// if object is Event
-			usage				= (Event<?>) obj;
-			immediateResponse	= isRecipientAvailable(-1);	// TODO replace with wanted clientID
-		} else if (obj instanceof LoginCredentials) {// if object is LoginCredential
-			responseToSameSocket = true;
-			LoginCredentials cast = (LoginCredentials) obj;
-			usage = new User(currentUserID++, cast.getName());
-		} else throw new IllegalArgumentException();
-
-		// handling of incoming object
-		if (immediateResponse) {
+			// Process object
+			processors.stream()
+				.filter(p -> p.getInputClass().isInstance(obj))
+				.forEach((@SuppressWarnings("rawtypes") ObjectProcessor p) -> {
+					Object responseObj = p.process(p.getInputClass().cast(obj));
+					if (responseObj != null) {
+						// Create message targeted at the client
 						Message response = writeProxy.getMessage();
-			if (responseToSameSocket) {
-				response.socketId = request.socketId;
-			} else {
-				response.socketId = -0;// TODO temporary.Needs to be replaced
-				return;
-			}
+						response.socketId = message.socketId;
+
 						// Serialize object to byte array
 						ByteArrayOutputStream baos = new ByteArrayOutputStream();
 						try (ObjectOutputStream oout = new ObjectOutputStream(baos)) {
-				oout.writeObject(usage);
+							oout.writeObject(responseObj);
 						} catch (IOException e) {
 							e.printStackTrace();
 						}
@@ -88,16 +53,9 @@ public class ObjectMessageProcessor implements IMessageProcessor {
 						response.writeToMessage(objBytes);
 						writeProxy.enqueue(response);
 					}
+				});
+		} catch (IOException | ClassNotFoundException e) {
+			e.printStackTrace();
 		}
-
-	/**
-	 * This method determines if the recipient is online
-	 * 
-	 * @param otherClientID the ID of the recipient
-	 * @return true, if the recipient is online
-	 * @since Envoy Server Standalone v0.1-alpha
-	 */
-	private boolean isRecipientAvailable(long otherClientID) {
-		return false;// TODO needs to be adapted to return true if the wanted client is online
 	}
 }

src/main/java/envoy/server/ObjectProcessor.java

@@ -0,0 +1,17 @@
+package envoy.server;
+
+
+/**
+ * Project: <strong>envoy-server-standalone</strong><br>
+ * File: <strong>ObjectProcessor.java</strong><br>
+ * Created: <strong>30.12.2019</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy Server Standalone v0.1-alpha
+ */
+public interface ObjectProcessor<T, U> {
+
+	U process(T input);
+
+	Class<T> getInputClass();
+}

src/main/java/envoy/server/Startup.java

@@ -1,6 +1,8 @@
 package envoy.server;
 
 import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
 
 import com.jenkov.nioserver.Server;
 
@@ -15,7 +17,10 @@ import com.jenkov.nioserver.Server;
 public class Startup {
 
 	public static void main(String[] args) throws IOException {
-		Server server = new Server(8080, () -> new ObjectMessageReader(), new ObjectMessageProcessor());
+		Set<ObjectProcessor<?, ?>> processors = new HashSet<>();
+		processors.add(new LoginCredentialProcessor());
+		processors.add(new MessageProcessor());
+		Server server = new Server(8080, () -> new ObjectMessageReader(), new ObjectMessageProcessor(processors));
 		server.start();
 	}
 }