Kotlin Blueprints

Service/Controller

The MessageController handles all the URLs, or you can say operations, related to messages. To have a separation of concern in our code. The actual job of saving the message, that is the database operations, is delegated to the respective Repository class (MessageRepository):

    /**      * Exposes the operations related to creating and showing      * messages through URLs using REST      */    @RestController    @RequestMapping("/message")    class MessageController(val repository: MessageRepository) {      val broadcaster = ReactiveBroadcaster()    /**      * Creates new message and saves it into DB      */    @PostMapping    @ResponseStatus(CREATED)    fun create(@RequestBody message: Message): Message {      val msg = repository.insert(message)      broadcaster.send(msg)      return ...