Implemented groups support on server

Implemented support for group messages in MessageProcessor and adjusted
IdGeneratorRequestProcessor

src/main/java/envoy/server/processors/IDGeneratorRequestProcessor.java

@@ -14,6 +14,7 @@ import envoy.server.net.ObjectWriteProxy;
  * Created: <strong>28 Jan 2020</strong><br>
  *
  * @author Kai S. K. Engelbart
+ * @author Maximilian K&auml;fer
  * @since Envoy Server Standalone v0.1-alpha
  */
 public class IDGeneratorRequestProcessor implements ObjectProcessor<IDGeneratorRequest> {
@@ -26,13 +27,19 @@ public class IDGeneratorRequestProcessor implements ObjectProcessor<IDGeneratorR
 	@Override
 	public void process(IDGeneratorRequest input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
 		System.out.println("Received id generation request.");
-
+		var generator = createIDGenerator();
-		ConfigItem	currentId	= PersistenceManager.getInstance().getConfigItemById("currentMessageId");
-		IDGenerator	generator	= new IDGenerator(Integer.parseInt(currentId.getValue()), ID_RANGE);
-		currentId.setValue(String.valueOf(Integer.parseInt(currentId.getValue()) + ID_RANGE));
-		PersistenceManager.getInstance().updateConfigItem(currentId);
 
 		System.out.println("Sending new id generator " + generator);
 		writeProxy.write(socketId, generator);
 	}
+
+	public static IDGenerator createIDGenerator() { return createIDGenerator(ID_RANGE); }
+
+	public static IDGenerator createIDGenerator(long range) {
+		ConfigItem	currentId	= PersistenceManager.getInstance().getConfigItemById("currentMessageId");
+		IDGenerator	generator	= new IDGenerator(Integer.parseInt(currentId.getValue()), range);
+		currentId.setValue(String.valueOf(Integer.parseInt(currentId.getValue()) + range));
+		PersistenceManager.getInstance().updateConfigItem(currentId);
+		return generator;
+	}
 }

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

@@ -4,7 +4,10 @@ import java.io.IOException;
 import java.util.Date;
 
 import envoy.data.Message;
+import envoy.data.Message.MessageStatus;
+import envoy.data.MessageBuilder;
 import envoy.event.MessageStatusChangeEvent;
+import envoy.server.data.Contact;
 import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
@@ -17,6 +20,7 @@ import envoy.server.net.ObjectWriteProxy;
  * Created: <strong>30.12.2019</strong><br>
  *
  * @author Kai S. K. Engelbart
+ * @author Maximilian K&auml;fer
  * @since Envoy Server Standalone v0.1-alpha
  */
 public class MessageProcessor implements ObjectProcessor<Message> {
@@ -24,21 +28,53 @@ public class MessageProcessor implements ObjectProcessor<Message> {
 	@Override
 	public void process(Message message, long socketId, ObjectWriteProxy writeProxy) {
 
-		ConnectionManager connectionManager = ConnectionManager.getInstance();
 		message.nextStatus();
+		ConnectionManager	connectionManager	= ConnectionManager.getInstance();
+		Contact				recipient			= PersistenceManager.getInstance().getContactById(message.getId());
+
+		if (recipient instanceof envoy.server.data.User) {
+			System.out.println("The received message is a direct message.");
+			sendToUser(connectionManager, message, writeProxy);
+			// Sending a messageStatusChangeEvent to the sender
+			try {
+				writeProxy.write(socketId, new MessageStatusChangeEvent(message));
+			} catch (IOException e) {
+				System.err.println("Could not send messageStatusChangeEvent to the sender of this message with ID: " + message.getId());
+				e.printStackTrace();
+			}
+		} else {
+			System.out.println("The received message is a group message.");
+			final var	members		= PersistenceManager.getInstance().getGroupById(message.getRecipientId()).getMembers();
+			final var	generator	= IDGeneratorRequestProcessor.createIDGenerator(members.size());
+			members.forEach(user -> {
+				envoy.data.Message returnMessage = new MessageBuilder(message.getRecipientId(), user.getID(), generator)
+					.setDate(message.getCreationDate())
+					.setText(message.getText())
+					.setAttachment(message.getAttachment())
+					.setStatus(MessageStatus.SENT)
+					.setForwarded(message.isForwarded())
+					.build();
+				sendToUser(connectionManager, returnMessage, writeProxy);
+
+				// TODO Handle messageStatusChangeEvent because we have many recipients and
+				// copies of the original message. (Not at this location)
+			});
+		}
+		PersistenceManager.getInstance().addMessage(new envoy.server.data.Message(message));
+	}
+
+	private void sendToUser(ConnectionManager connectionManager, Message message, ObjectWriteProxy writeProxy) {
 		if (connectionManager.isOnline(message.getRecipientId())) try {
 			// If recipient is online, send the message directly
 			writeProxy.write(connectionManager.getSocketId(message.getRecipientId()), message);
-
 			// Update the message status to RECEIVED
 			message.setReceivedDate(new Date());
 			message.nextStatus();
-			writeProxy.write(socketId, new MessageStatusChangeEvent(message));
+
 		} catch (IOException e) {
 			System.err.println("Recipient online. Failed to send message" + message.getId());
 			e.printStackTrace();
 		}
-		PersistenceManager.getInstance().addMessage(new envoy.server.data.Message(message));
 	}
 
 	@Override