Hands-On Design Patterns with Kotlin

Verticles

Now come across a problem, though. Our code resides in the Main.kt file, which grows bigger and bigger. We can start splitting it by using verticles.

You can think of a verticle as a lightweight actor. Let's see an example; look at the following code:

class ServerVerticle: CoroutineVerticle() {    override suspend fun start() {        val router = router()        vertx.createHttpServer().requestHandler(router::accept).listen(8080)    }    private fun router(): Router {        val router = Router.router(vertx)        // Our router code comes here now        ...        return router    }}

Now we need to start this verticle. There are different ways of doing that, but the simplest way is to pass the instance of this class to the deployVerticle() method:

vertx.deployVerticle(ServerVerticle()) ...