Die detaillierte Aufgabenstellung beschreibt die notwendigen Schritte zur Realisierung.

• ClientWorker: create Input/Output stream. Don't forget autoFlush: true
• run: while listening reads line from input stream and checks if it is a cmd and executed else it will be given to SimpleChatServer
• shutdown: Send !STOP over socket and closes all resources.
• send: out.println, if Exception shutdown ClientWorker

• run: Initialites ServerSocket and start accepting new clients.
• recieved: Get the message from ClientWorker and adds the username in front of it. Notify SimpleChat about it and send it to the other clients.
• send(String message): Sends the supplied message to all clients.
• send(String message, String receiver): Sends a message to a specific ClientWorker if it was found by name
• getWorker: Finds an ClientWorker by ChatName and returns it.
• setName: Sets an name for a ClientWorker
• removeClient(ClientWorker): Shutdowns and removes client
• removeClient(String): remove client by ChatName
• shutdown: Shutdown all clients an closes thread.

• sendMessage(String): Sends message to all users when connected
• sendMessage(String, String): Sends message to specified user
• incomingMessage: Saves the message and displayes it on GUI
• addClient: Adds client to users and sends it to GUI. Also finds unique username
• renameClient: Renames a client
• removeClient: removes a client
• shutdownClient: Method for GUI to shutdown Client

events are consumed to stop further execution of handlers.
When modifying the ListView or other GUI elements you need to wrap in in Platform.runLater() to be on the GUI thread.

Helpsers for messaging and Commands

• run: Initialises the Socket and listens for new messages
• received: Analyzes the received message for commands or gives it to SimpleChat
• send(String): Sends message to server
• send(String, String): Sends private message to other user
• shutdown: disconects from the server

Mostly passthrough from SimpleChatClient to Controller

Sends messages on Button Click and updates textArea with new text. This update runs on the GUI thread by using Platform.runLater()

https://stackoverflow.com/questions/21083945/how-to-avoid-not-on-fx-application-thread-currentthread-javafx-application-th